Zoom lens and image pickup apparatus using the same
10809505 ยท 2020-10-20
Assignee
Inventors
Cpc classification
G02B13/18
PHYSICS
G02B27/0062
PHYSICS
G02B13/02
PHYSICS
H04N23/69
ELECTRICITY
International classification
G02B15/14
PHYSICS
G02B15/20
PHYSICS
G02B27/00
PHYSICS
G02B13/02
PHYSICS
Abstract
A zoom lens includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. At the time of zooming, distances between lenses vary. A distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, and the following conditional expressions (1), (2), and (3) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3).
Claims
1. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (4), and (22) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
5<f1/fw<2.15(4)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, fw denotes a focal length of the overall zoom lens system at the wide angle end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and r3fb denotes a radius of curvature of an image-side surface of the focusing lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
2. The zoom lens according to claim 1, wherein the following conditional expression (6) is satisfied:
2.5<L1/f1<0.8(6).
3. The zoom lens according to claim 1, wherein the following conditional expression (8) is satisfied:
0.3<L2/f2<1.5(8).
4. The zoom lens according to claim 1, wherein the following conditional expression (9) is satisfied:
0<L12airt/L2<0.9(9) where, L12airt denotes an air space between the first lens unit and the second lens unit at the telephoto end.
5. The zoom lens according to claim 1, wherein the following conditional expression (10) is satisfied:
0.5<f3/f1<6(10) where, f3 denotes a focal length of the third lens unit.
6. The zoom lens according to claim 1, wherein: the first lens unit includes a plurality of lenses, and the plurality of lenses include at least two negative lenses and one positive lens.
7. The zoom lens according to claim 1, wherein: the second lens unit includes an object-side lens component and an image-side lens component, and the following conditional expression (27) is satisfied:
0.5<f2f/f2b<9(27) where, f2f denotes a focal length of the object-side lens component, and f2b denotes a focal length of an image-side lens component, and here, the lens component is one of a single lens and a cemented lens.
8. The zoom lens according to claim 1, wherein: the fourth lens unit includes one positive lens, and the following conditional expressions (29), (30), and (31) are satisfied:
nd3<1.7(29)
nd4<1.7(30)
|vd3vd4|<33(31) where, nd3 denotes a refractive index for a d-line of the negative lens in the third lens unit, vd3 denotes Abbe number for the negative lens in the third lens unit, nd4 denotes a refractive index for a d-line of the positive lens in the fourth lens unit, and vd4 denotes Abbe number for the positive lens in the fourth lens unit.
9. The zoom lens according to claim 1, wherein: the second lens unit includes a negative lens, and an object-side surface of the negative lens in the second lens unit is convex toward the object side.
10. The zoom lens according to claim 1, wherein: the second lens unit includes, in order from the object side, a positive lens and a cemented lens, the cemented lens includes a negative lens and a positive lens, and an object-side surface of the negative lens in the cemented lens is convex toward the object side.
11. An image pickup apparatus, comprising: the zoom lens according to claim 1; and an image pickup element which converts an image formed by the zoom lens to an electric signal.
12. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (5), and (22) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
10<L1/(ytan 2w)<0.5(5)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, y denotes the maximum image height at an image forming surface in the zoom lens, w denotes a half angle of view at the wide angle end of the zoom lens, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and r3fb denotes a radius of curvature of an image-side surface of the focusing lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
13. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (7), and (22) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
8<L2/(ytan 2w)<0.4(7)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, y denotes the maximum image height at an image forming surface in the zoom lens, w denotes a half angle of view at the wide angle end of the zoom lens, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and r3fb denotes a radius of curvature of an image-side surface of the focusing lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
14. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (11), and (22) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.5<f4/L1<3.5(11)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, f4 denotes a focal length of the fourth lens unit, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and r3fb denotes a radius of curvature of an image-side surface of the focusing lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
15. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (22), and (25) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22)
0.60<f1/L12airw<0.20(25) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, r3fb denotes a radius of curvature of an image-side surface of the focusing lens, the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out, and L12airw denotes an air space between the first lens unit and the second lens unit at the wide angle end.
16. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (22), and (26) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22)
0.30<f2/L12airw<0.70(26) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, r3fb denotes a radius of curvature of an image-side surface of the focusing lens, the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out, and L12airw denotes an air space between the first lens unit and the second lens unit at the wide angle.
17. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the first lens unit moves from the object side to an image side only, at the time of zooming, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), and (22) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and r3fb denotes a radius of curvature of an image-side surface of the focusing lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
18. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (22), and (28) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22)
80%<DTw<8%(28) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, r3fb denotes a radius of curvature of an image-side surface of the focusing lens, the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out, and DTw denotes an amount of distortion at the maximum image height at the wide angle end.
19. A zoom lens comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein: at a time of zooming, distances between lens units vary, a distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, the third lens unit includes one negative lens, the negative lens is a focusing lens, the focusing lens moves toward the object side at a time of focusing to an object at a close distance, and the following conditional expressions (1), (2), (3), (22), and (32) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22)
35<Lt/(ytan 2w)<2(32) where, f1 denotes a focal length of the first lens unit, f2 denotes a focal length of the second lens unit, L1 denotes a thickness on an optical axis of the first lens unit, L2 denotes a thickness on an optical axis of the second lens unit, Lw denotes an overall length of the zoom lens at the wide angle end, Lt denotes an overall length of the zoom lens at the telephoto end, r3ff denotes a radius of curvature of an object-side surface of the focusing lens, r3fb denotes a radius of curvature of an image-side surface of the focusing lens, y denotes the maximum image height at an image forming surface in the zoom lens, and w denotes a half angle of view at the wide angle end of the zoom lens, and here the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
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DETAILED DESCRIPTION OF THE INVENTION
(41) Prior to the explanation of examples, action and effect of embodiments according to certain aspects of the present invention will be described below. In the explanation of the action and effect of the embodiments concretely, the explanation will be made by citing concrete examples. However, similar to a case of the examples to be described later, aspects exemplified thereof are only some of the aspects included in the present invention, and there exists a large number of variations in these aspects. Consequently, the present invention is not restricted to the aspects that will be exemplified.
(42) A zoom lens of the present embodiment includes in order from an object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. At a time of zooming, distances between lens units vary. A distance between the first lens unit and the second lens unit becomes smaller at a telephoto end than at a wide angle end, and a distance between the second lens unit and the third lens unit becomes longer at the telephoto end than at the wide angle end, and the following conditional expressions (1), (2), and (3) are satisfied:
0.4<|f1|/|f2|<1.2(1)
0.3<L2/L1<0.95(2)
0.6<Lt/Lw<1(3)
(43) where,
(44) f1 denotes a focal length of the first lens unit,
(45) f2 denotes a focal length of the second lens unit,
(46) L1 denotes a thickness on an optical axis of the first lens unit,
(47) L2 denotes a thickness on an optical axis of the second lens unit,
(48) Lw denotes an overall length of the zoom lens at the wide angle end, and
(49) Lt denotes an overall length of the zoom lens at the telephoto end, and here
(50) the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
(51) The zoom lens of the present embodiment includes in order from the object side, the first lens unit having a negative refractive power, the second lens unit having a positive refractive power, the third lens unit having a negative refractive power, and the fourth lens unit having a positive refractive power.
(52) In the zoom lens of the present embodiment, a lens unit having a negative refractive power is disposed nearest to object. Thus, in the zoom lens of the present embodiment, an optical system of a negative-lead type has been adopted. Consequently, it is possible to make wide an angle of view at the wide angle end.
(53) Moreover, the refractive power of the second lens unit is a positive refractive power and the refractive power of the third lens unit is a negative refractive power. Consequently, an optical system of a telephoto type is formed by the second lens unit and the third lens unit. Accordingly, since it is possible to shorten a distance between the third lens unit and the fourth lens unit, it is possible to make the optical system small-sized.
(54) Moreover, since distances between the lens units vary at the time of zooming, it is possible to make small a variation in a curvature of field accompanied by the zooming.
(55) In conditional expression (1), a ratio of the focal length of the first lens unit and the focal length of the second lens unit is used. By exceeding a lower limit value of conditional expression (1), it is possible to correct an astigmatism while achieving small-sizing of the first lens unit. By a value falling below an upper limit value of conditional expression (1), it is possible to correct a coma while securing a wide angle of view.
(56) In conditional expression (2), a ratio of the thickness on the optical axis of the first lens unit and the thickness on the optical axis of the second lens unit is used. The thickness on the optical axis of the first lens unit (hereinafter, referred to as thickness of the first lens unit) is a distance in an optical axial direction from a lens surface nearest to object of the first lens unit up to a lens surface nearest to image of the first lens unit. The thickness on the optical axis of the second lens unit (hereinafter, referred to as thickness of the second lens unit) is a distance in the optical axial direction from a lens surface nearest to object of the second lens unit up to a lens surface nearest to image of the second lens unit.
(57) By exceeding a lower limit value of conditional expression (2), it is possible to suppress an occurrence of the astigmatism in the first lens unit while maintaining a wide angle of view. By a value falling below an upper limit value of conditional expression (2), it is possible to secure adequately a space in which the second lens unit moves at the time of zooming. As a result, it is possible to secure a large zooming ratio as well as to suppress a fluctuation in an image-plane position.
(58) In conditional expression (3), a ratio of the overall length of the zoom lens at the wide angle end and the overall length of the zoom lens at the telephoto end is used. The overall length of the zoom lens is a distance from a surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
(59) By exceeding a lower limit value of conditional expression (3), it is possible to secure adequately a space in which the second lens unit moves at the time of zooming. As a result, it is possible to secure a large zooming ratio as well as to suppress a fluctuation in the image-plane position.
(60) As the angle of view at the wide angle end becomes wider, a light ray is more susceptible to be vignetted by a member holding the optical system. Moreover, when the overall length of the zoom lens at the telephoto end becomes longer than the overall length of the zoom lens at the wide angle end, a light ray is susceptible to be vignetted by the member holding the optical system. By a value falling below an upper limit value of conditional expression (3), it is possible to prevent vignetting of a light ray. As a result, it is possible to secure a high optical performance throughout the entire zoom range.
(61) It is preferable that the following conditional expression (1) be satisfied instead of conditional expression (1)
0.5<|f1|/|f2|<1.1(1)
(62) It is more preferable that the following conditional expression (1) be satisfied instead of conditional expression (1).
0.55<|f1|/|f2|<1.05(1)
(63) It is preferable that the following conditional expression (2) be satisfied instead of conditional expression (2).
0.35<L2/L1<0.945(2)
(64) It is more preferable that the following conditional expression (2) be satisfied instead of conditional expression (2).
0.4<L2/L1<0.945(2)
(65) It is preferable that the following conditional expression (3) be satisfied instead of conditional expression (3).
0.65<Lt/Lw<0.95(3)
(66) It is more preferable that the following conditional expression (3) be satisfied instead of conditional expression (3).
0.7<Lt/Lw<0.9(3)
(67) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (4) be satisfied:
5<f1/fw<2.15(4)
(68) where,
(69) f1 denotes the focal length of the first lens unit, and
(70) fw denotes a focal length of the overall zoom lens system at the wide angle end.
(71) In conditional expression (4), a ratio of the focal length of the first lens unit and the focal length of the overall zoom lens at the wide angle end is used.
(72) When a lower limit value of conditional expression (4) is exceeded, it is possible to make the focal length of the first lens unit short (to make the negative refractive power large). In this case, since it is possible to bring a position of an entrance pupil closer to the object side, it is possible to make a diameter of the first lens unit small. As a result, it is possible to make the first lens unit and the optical system small-sized.
(73) When a value falls below a lower limit value of conditional expression (4), it is possible to make the focal length of the first lens unit long (to make the negative refractive power small). As a result, it is possible to suppress an occurrence of a chromatic aberration of magnification and an occurrence of the astigmatism at the wide angle end. Moreover, it is possible to suppress an occurrence of the chromatic aberration of magnification at the telephoto end.
(74) It is preferable that the following conditional expression (4) be satisfied instead of conditional expression (4).
4.5<f1/fw<2.2(4)
(75) It is more preferable that the following conditional expression (4) be satisfied instead of conditional expression (4).
4<f1/fw<2.25(4)
(76) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (5) be satisfied:
10<L1/(ytan 2w)<0.5(5)
(77) where,
(78) L1 denotes the thickness on the optical axis of the first lens unit,
(79) y denotes the maximum image height at an image forming surface in the zoom lens, and
(80) w denotes a half angle of view at the wide angle end of the zoom lens.
(81) Conditional expression (5) is a conditional expression related to the thickness of the first lens unit. In conditional expression (5), the thickness of the first lens unit is normalized by the maximum image height of the image forming surface in the zoom lens, and a result of normalization is divided further by a tangent of the angle of view of the zoom lens.
(82) By exceeding a lower limit value of conditional expression (5), it is possible to suppress an increase in the thickness of the first lens unit. As a result, it is possible to make the zoom lens compact. By a value falling below an upper limit value of conditional expression (5), it is possible to secure a wide angle of view at the wide angle end.
(83) It is preferable that the following conditional expression (5) be satisfied instead of conditional expression (5).
9<L1/(ytan 2w)<0.7(5)
(84) It is more preferable that the following conditional expression (5) be satisfied instead of conditional expression (5).
7<L1/(ytan 2w)<1(5)
(85) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (6) be satisfied:
2.5<L1/f1<0.8(6)
(86) where,
(87) L1 denotes the thickness on the axial axis of the first lens unit, and
(88) f1 denotes the focal length of the first lens unit.
(89) In conditional expression (6), a ratio of the thickness of the first lens unit and the focal length of the first lens unit is used. By satisfying conditional expression (6), it is possible to suppress an increase in the thickness of the first lens unit. As a result, it is possible to facilitate shortening the overall length of the zoom lens and to correct the astigmatism favorably.
(90) By exceeding a lower limit value of conditional expression (6), it is possible to correct the astigmatism while maintaining a wide angle of view. By a value falling below an upper limit value of conditional expression (6), it is possible to suppress the increase in the first lens unit. As a result, it is possible to make the zoom lens compact.
(91) It is preferable the following conditional expression (6) be satisfied instead of conditional expression (6).
2.4<L1/f1<0.9(6)
(92) It is more preferable that the following conditional expression (6) be satisfied instead of conditional expression (6).
2.3<L1/f1<1(6)
(93) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (7) be satisfied:
8<L2/(ytan 2w)<0.4(7)
(94) where,
(95) L2 denotes the thickness on the optical axis of the second lens unit,
(96) y denotes the maximum image height at an image forming surface in the zoom lens, and
(97) w denotes the half angle of view at the wide angle end of the zoom lens.
(98) Conditional expression (7) is a conditional expression related to the thickness of the second lens unit. In conditional expression (7), the thickness of the second lens unit is normalized by the maximum image height of the image forming surface in the zoom lens, and a result of normalization is divided further by a tangent of the angle of view of the zoom lens.
(99) By exceeding a lower limit value of conditional expression (7), it is possible to suppress an increase in the thickness of the second lens unit. As a result, it is possible to make the zoom lens compact. By a value falling below an upper limit value of conditional expression (7), it is possible to secure a wide angle of view at the wide angle end.
(100) It is preferable that the following conditional expression (7) be satisfied instead of conditional expression (7).
7<L2/(ytan 2w)<0.45(7)
(101) It is more preferable that the following conditional expression (7) be satisfied instead of conditional expression (7).
5<L2/(ytan 2w)<0.5(7)
(102) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (8) be satisfied:
0.3<L2/f2<1.5(8)
(103) where,
(104) L2 denotes the thickness on the optical axis of the second lens unit, and
(105) f2 denotes the focal length of the second lens unit.
(106) In conditional expression (8), a ratio of the thickness of the second lens unit and the focal length of the second lens unit is used. By satisfying conditional expression (8), it is possible to suppress the increase in the thickness of the second lens unit. As a result, it is possible to facilitate shortening the overall length of the zoom lens and to correct a spherical aberration and the coma favorably.
(107) By exceeding a lower limit value of conditional expression (8), it is possible to correct the spherical aberration and the coma. By a value falling below an upper limit value of conditional expression (8), it is possible to suppress the increase in the thickness of the second lens unit. As a result, it is possible to make the zoom lens compact.
(108) It is preferable that the following conditional expression (8) be satisfied instead of conditional expression (8).
0.4<L2/f2<1.3(8)
(109) It is more preferable that the following conditional expression (8) be satisfied instead of conditional expression (8).
0.5<L2/f2<1.2(8)
(110) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (9) be satisfied:
0<L12airt/L2<0.9(9)
(111) where,
(112) L12airt denotes an air space between the first lens unit and the second lens unit at the telephoto end, and
(113) L2 denotes the thickness on the optical axis of the second lens unit.
(114) In conditional expression (9), a ratio of a predetermined air space at the telephoto end and the thickness of the second lens unit, is used. The predetermined air space is the air space between the first lens unit and the second lens unit.
(115) By exceeding a lower limit value of conditional expression (9), it is possible to avoid a physical interference between the first lens unit and the second lens unit. By a value falling below an upper limit value of conditional expression (9), it is possible to secure a high zooming ratio while achieving small-sizing of the zoom lens at the telephoto end.
(116) It is preferable that the following conditional expression (9) be satisfied instead of conditional expression (9).
0.1<L12airt/L2<0.8(9)
(117) It is more preferable that the following conditional expression (9) be satisfied instead of conditional expression (9).
0.1<L12airt/L2<0.77(9)
(118) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (10) be satisfied:
0.5<f3/f1<6(10)
(119) where,
(120) f1 denotes the focal length of the first lens unit, and
(121) f3 denotes a focal length of the third lens unit.
(122) In conditional expression (10), a ratio of the focal length of the third lens unit and the focal length of the first lens unit is used. As mentioned above, an optical system of a telephoto type is formed by the second lens unit and the third lens unit. Accordingly, it is possible to achieve an effect of the optical system of a telephoto type (hereinafter, referred to as telephoto effect). An example of the telephoto effect is shortening of the overall length of the optical system.
(123) By exceeding a lower limit value of conditional expression (10), it is possible to correct the astigmatism while maintaining a wide angle of view. By a value falling below an upper limit value of conditional expression (10), it is possible to make the telephoto effect strong. As a result, it is possible to shorten the overall length of the zoom lens.
(124) It is preferable that the following conditional expression (10) be satisfied instead of conditional expression (10).
0.6<f3/f1<5(10)
(125) It is more preferable that the following conditional expression (10) be satisfied instead of conditional expression (10).
0.7<f3/f1<4(10)
(126) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (11) be satisfied:
0.5<f4/L1<3.5(11)
(127) where,
(128) L1 denotes the thickness on the optical axis of the first lens unit, and
(129) f4 denotes a focal length of the fourth lens unit.
(130) In conditional expression (11), a ratio of the focal length of the fourth lens unit and the thickness of the first lens unit is used. By exceeding a lower limit value of conditional expression (11), it is possible to suppress an occurrence of the coma in the fourth lens unit. By a value falling below an upper limit value of conditional expression (11), it is possible to correct the chromatic aberration of magnification in the fourth lens unit. Moreover, since it is possible to secure the thickness of the first lens unit adequately, it is possible to correct the astigmatism.
(131) It is preferable that the following conditional expression (11) be satisfied instead of conditional expression (11).
0.6<f4/L1<3(11)
(132) It is more preferable that the following conditional expression (11) be satisfied instead of conditional expression (11).
0.625<f4/L1<2.5(11)
(133) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (12) be satisfied:
0.8<3t/3w<1.8(12)
(134) where,
(135) 3w denotes a lateral magnification of the third lens unit at the wide angle end, and
(136) 3t denotes a lateral magnification of the third lens unit at the telephoto end.
(137) In conditional expression (12) a ratio of the lateral magnification of the third lens unit at the wide angle end and the lateral magnification of the third lens unit at the telephoto end is used. For securing a high zooming ratio, it is preferable that a value does not fall below a lower limit value of conditional expression (12). By a value falling below an upper limit value of conditional expression (12), it is possible to suppress a fluctuation in the astigmatism accompanied by zooming.
(138) It is preferable that the following conditional expression (12) be satisfied instead of conditional expression (12).
0.85<3t/3w<1.7(12)
(139) It is more preferable that the following conditional expression (12) be satisfied instead of conditional expression (12).
0.9<3t/3w<1.4(12)
(140) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (13) be satisfied:
0.6<2w<0.15(13)
(141) where,
(142) 2w denotes a lateral magnification of the second lens unit at the wide angle end.
(143) Conditional expression (13) is a conditional expression related to the lateral magnification of the second lens unit at the wide angle end. By exceeding a lower limit value of conditional expression (13), an absolute value of the lateral magnification becomes small (the absolute value of lateral magnification comes closer to zero). In this case, it is possible to widen the distance between the first lens unit and the second lens unit. Making such arrangement is advantageous for securing a high zooming ratio.
(144) By a value falling below an upper limit value of conditional expression (13), it is possible not to let the distance between the first lens unit and the second lens unit to be widened excessively. As a result, it is possible to shorten the overall length of the optical system. Moreover, since it is possible to suppress the increase in the distance between the first lens unit and the second lens unit, it is possible to suppress a height of an axial light ray that passes through the second lens unit. Consequently, it is possible to suppress an occurrence of the spherical aberration.
(145) It is preferable that the following conditional expression (13) be satisfied instead of conditional expression (13).
0.5<2w<0.2(13)
(146) It is more preferable that the following conditional expression (13) be satisfied instead of conditional expression (13).
0.45<2w<0.22(13)
(147) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (14) be satisfied:
1.5<2t/2w<5(14)
(148) 2w denotes the lateral magnification of the second lens unit at the wide angle end, and
(149) 2t denotes a lateral magnification of the second lens unit at the telephoto end.
(150) In conditional expression (14), a ratio of the lateral magnification of the second lens unit at the wide angle end and the lateral magnification of the second lens unit at the telephoto end is used. By exceeding a lower limit value of conditional expression (14), it is possible to secure the zooming ratio adequately.
(151) By a value falling an upper limit value of conditional expression (14), it is possible to suppress an increase in the overall length of the optical system at the wide angle end. The overall length of the optical system is susceptible to become long at the telephoto end. However, since the increase in the overall length of the optical system at the wide angle end has been suppressed, it is possible to suppress the overall length of the optical system at the telephoto end.
(152) It is preferable that the following conditional expression (14) be satisfied instead of conditional expression (14).
1.6<2t/2w<4.7(14)
(153) It is more preferable that the following conditional expression (14) be satisfied instead of conditional expression (14).
1.8<2t/2w<4.3(14)
(154) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (15) be satisfied:
0.6<(2t/2w)/(ft/fw)<1.1(15)
(155) where,
(156) 2w denotes the lateral magnification of the second lens unit at the wide angle end,
(157) 2t denotes the lateral magnification of the second lens unit at the telephoto end,
(158) fw denotes the focal length of the overall zoom lens system at the wide angle end, and
(159) ft denotes a focal length of the overall zoom lens system at the telephoto end.
(160) In conditional expression (15), a ratio of a zooming ratio of the second lens unit and a zooming ratio of the overall zoom lens is used.
(161) By exceeding a lower limit value of conditional expression (15), a load of zooming on the second lens unit does not become excessively small. In this case, since it is possible to make a load of zooming on the other lens unit small, it is possible to secure a high zooming ratio while suppressing an occurrence of aberration in the overall optical system.
(162) By a value falling below an upper limit value of conditional expression (15), the load of zooming on the second lens unit does not become excessively large. In this case, it is possible to suppress a fluctuation in an axial aberration. As a result, it is possible to maintain a favorable imaging performance while securing a high zooming ratio.
(163) It is preferable that the following conditional expression (15) be satisfied instead of conditional expression (15).
0.65<(2t/2w)/(ft/fw)<1.1(15)
(164) It is more preferable that the following conditional expression (15) be satisfied instead of conditional expression (15).
0.68<(2t/2w)/(ft/fw)<1.05(15)
(165) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (16) be satisfied:
1.0<(2t/2w)/(3t/3w)<6(16)
(166) where,
(167) 2w denotes the lateral magnification of the second lens unit at the wide angle end,
(168) 2t denotes the lateral magnification of the second lens unit at the telephoto end,
(169) 3w denotes the lateral magnification of the third lens unit at the wide angle end, and
(170) 3t denotes the lateral magnification of the third lens unit at the telephoto end.
(171) In conditional expression (16), the ratio of the zooming ratio of the second lens unit and the zooming ratio of the third lens unit is used.
(172) By exceeding a lower limit value of conditional expression (16), it is possible to make the zooming ratio of the second lens unit high. In this case, it is possible to suppress an increase in the zooming ratio of the third lens unit. Moreover, it is possible to suppress an increase in the lateral magnification of the third lens unit at the telephoto end. Consequently, it is possible to suppress an increase in a distance from the third lens unit up to an image plane. As a result, it is possible to shorten the overall length of the optical system.
(173) By a value falling below an upper limit value of conditional expression (16), it is possible to suppress a fluctuation in the astigmatism and a fluctuation in the coma in the second lens unit.
(174) It is preferable that the following conditional expression (16) be satisfied instead of conditional expression (16).
1.2<(2t/2w)/(3t/3w)<5(16)
(175) It is more preferable that the following conditional expression (16) be satisfied instead of conditional expression (16).
1.4<(2t/2w)/(3t/3w)<4.5(16)
(176) In the zoom lens of the present embodiment, it is preferable that focusing from an object at infinity to an object at a close distance be carried out only by the third lens unit, and the following conditional expression (17) be satisfied:
0.2<|fct|<4(17)
(177) where,
(178) fct is indicated by the following expression
fct=(1tt)tt, and here
(179) t denotes a lateral magnification of the third lens unit at the telephoto end, and
(180) t denotes a lateral magnification of a predetermined lens unit at the telephoto end, and here
(181) the predetermined lens unit is a lens unit which includes all lenses positioned on an image side of the third lens unit.
(182) Conditional expression (17) is a conditional expression related to a focusing sensitivity at the telephoto end. The focusing sensitivity is expressed as an amount of movement of an image plane with respect to an amount of movement of a lens at the time of focusing, and is obtained paraxially.
(183) By exceeding a lower limit value of conditional expression (17), the focusing sensitivity does not become excessively low. In this case, since it is possible to make small the amount of movement of a lens at the time of focusing, it is possible to suppress a fluctuation in the astigmatism and a fluctuation in the curvature of field at the time of focusing. Moreover, the amount of movement of a lens being small, it is possible to reduce a space for moving the lens. As a result, it is possible to shorten the overall length of the optical system.
(184) By a value falling below an upper limit value of conditional expression (17), the focusing sensitivity does not become excessively high. Consequently, it is possible to suppress an occurrence of the astigmatism and an occurrence of the curvature of field due to the movement of the lens.
(185) It is preferable that the following conditional expression (17) be satisfied instead of conditional expression (17).
0.25<|fct|<3.5(17)
(186) It is more preferable that the following conditional expression (17) be satisfied instead of conditional expression (17).
0.3<|fct|<3(17)
(187) In the zoom lens of the present embodiment, it is preferable that the focusing from the object at infinity to the object at a close distance be carried out only by the third lens unit, and the following conditional expression (18) be satisfied:
0.7<|fct|/|fcw|<4(18)
(188) where,
(189) fct and fcw are indicated by the following expressions,
fct=(1tt)tt,
fcw=(1ww)ww, and here
(190) t denotes the lateral magnification of the third lens unit at the telephoto end,
(191) t denotes the lateral magnification of the predetermined lens unit at the telephoto end,
(192) w denotes a lateral magnification of the third lens unit at the wide angle end, and
(193) w denotes a lateral magnification of the predetermined lens unit at the wide angle end, and here
(194) the predetermined lens unit is a lens unit which includes all lenses positioned on an image side of the third lens unit.
(195) In conditional expression (18), a ratio of the focusing sensitivity at the telephoto end and the focusing sensitivity at the telephoto end is used. By satisfying conditional expression (18), a fluctuation in the focusing sensitivity at the telephoto end and as well as a fluctuation in the focusing sensitivity at the wide angle end are suppressed. Consequently, the amount of movement of the image plane with respect to the amount of movement of the lens does not vary largely according to the focusing state. As a result, it is possible to control the movement of the lens easily.
(196) It is preferable that the following conditional expression (18) be satisfied instead of conditional expression (18).
0.8<|fct|/|fcw|<3.5(18)
(197) It is more preferable that the following conditional expression (18) be satisfied instead of conditional expression (18).
0.9<|fct|/|fcw|<2.5(18)
(198) In the zoom lens of the present embodiment, it is preferable that the third lens unit include one negative lens.
(199) By making such arrangement, it is possible to make the third lens unit small-sized and light-weight. In a case of carrying out focusing by the third lens unit, since it is possible to narrow a space necessary for the movement of lenses, it is possible to make the optical system small-sized. Moreover, since the lens to be moved is one lens, it is possible to carry out focusing at a high speed.
(200) In a case of moving the third lens unit toward the object side, the distance between the third lens unit and the fourth lens unit becomes wide. Consequently, a magnification of an image on the image plane varies. However, when the third lens unit is moved toward the object side, a height of a chief light ray incident on the third lens unit becomes high. Consequently, the magnification of an image on the image plane varies.
(201) The variation in magnification of an image in the latter is a variation that cancels the variation in magnification of an image in the former. In other words, it is possible to suppress the variation in magnification of an image at the time of focusing.
(202) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (19) be satisfied:
0<L12airt/Lt<0.2(19)
(203) where,
(204) L12airt denotes the air space between the first lens unit and the second lens unit at the telephoto end, and
(205) Lt denotes the overall length of the zoom lens at the telephoto end, and here
(206) the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
(207) In conditional expression (19), a ratio of the predetermined air space at the telephoto end and the overall length of the zoom lens at the telephoto end is used.
(208) By exceeding a lower limit value of conditional expression (19), it is possible to avoid a physical interference between the first lens unit and the second lens unit. By a value falling below an upper limit value of conditional expression (19), it is possible to secure a high zooming ratio while achieving small-sizing of the optical system at the telephoto end. Moreover, it is possible to suppress an increase in the air space between the first lens unit and the second lens unit. In this case, since it is possible suppress an increase in a height of an axial light ray that passes through the second lens unit, it is possible to suppress an occurrence of the spherical aberration.
(209) It is preferable that the following conditional expression (19) be satisfied instead of conditional expression (19).
0.01<L12airt/Lt<0.15(19)
(210) It is more preferable that the following conditional expression (19) be satisfied instead of conditional expression (19).
0.015<L12airt/Lt<0.12(19)
(211) In the zoom lens of the present embodiment, it is preferable that the first lens unit include an object-side negative lens which is nearest to object, and the following conditional expression (20) be satisfied:
0.6<(r1nf+r1nb)/(r1nfr1nb)<4(20)
(212) where,
(213) r1nf denotes a radius of curvature of an object-side surface of the object-side negative lens, and
(214) r1nb denotes a radius of curvature of an image-side surface of the object-side negative lens.
(215) Conditional expression (20) is a conditional expression related to a shaping factor of the object-side negative lens. By exceeding a lower limit value of conditional expression (20), it is possible to suppress an increase in an outer diameter of the first lens unit. When a value falls below an upper limit value of conditional expression (20), it is possible to suppress an occurrence of the astigmatism.
(216) It is preferable that the following conditional expression (20) be satisfied instead of conditional expression (20).
0.8<(r1nf+r1nb)/(r1nfr1nb)<3(20)
(217) It is more preferable that the following conditional expression (20) be satisfied instead of conditional expression (20).
1.0<(r1nf+r1nb)/(r1nfr1nb)<2.6(20)
(218) In the zoom lens of the present embodiment, it is preferable that the first lens unit include an image-side positive lens which is nearest to image, and the following conditional expression (21) be satisfied:
8<(r1pf+r1pb)/(r1pfr1pb)<2(21)
(219) where,
(220) r1pf denotes a radius of curvature of an object-side surface of the image-side positive lens, and
(221) r1pb denotes a radius of curvature of an image-side surface of the image-side positive lens.
(222) Conditional expression (21) is a conditional expression related to a shaping factor of the image-side positive lens. By satisfying conditional expression (21), it is possible to correct the spherical aberration favorably.
(223) It is preferable that the following conditional expression (21) be satisfied instead of conditional expression (21).
7<(r1pf+r1pb)/(r1pfr1pb)<1.5(21)
(224) It is more preferable that the following conditional expression (21) be satisfied instead of conditional expression (21).
6<(r1pf+r1pb)/(r1pfr1pb)<1(21)
(225) In the zoom lens of the present embodiment, it is preferable that the third lens unit include one negative lens, and the negative lens be the focusing lens, and a focusing lens move toward the object side at the time of focusing to an object at a close distance, and the following conditional expression (22) be satisfied:
0.1<(r3ff+r3fb)/(r3ffr3fb)<10(22)
(226) where,
(227) r3ff denotes a radius of curvature of an object-side surface of the focusing lens, and
(228) r3fb denotes a radius of curvature of an image-side surface of the focusing lens.
(229) Conditional expression (22) is a conditional expression related to a shaping factor of the focusing lens. By satisfying conditional expression (22), it is possible to suppress a fluctuation in the spherical aberration at the time of focusing.
(230) It is preferable that the following conditional expression (22) be satisfied instead of conditional expression (22).
0.15<(r3ff+r3fb)/(r3ffr3fb)<7.5(22)
(231) It is more preferable that the following conditional expression (22) be satisfied instead of conditional expression (22).
0.2<(r3ff+r3fb)/(r3ffr3fb)<5.5(22)
(232) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (23) be satisfied:
1.1<L1/L1air<4.00(23)
(233) where,
(234) L1 denotes the thickness on the optical axis of the first lens unit, and
(235) L1air denotes a sum total of an air space on the optical axis in the first lens unit.
(236) In conditional expression (23), a ratio of the thickness of the first lens unit and the sum total of the air space in the first lens unit is used.
(237) By exceeding a lower limit value of conditional expression (23), it is possible to suppress an increase in the air space in the first lens unit. As a result, it is possible to correct the chromatic aberration of magnification and the astigmatism favorably while small-sizing the first lens unit.
(238) By a value falling below an upper limit value of conditional expression (23), it is possible to provide an appropriate air space in the first lens unit. As a result, it is possible to suppress an occurrence of the astigmatism and an occurrence of the chromatic aberration of magnification while small-sizing the first lens unit.
(239) It is preferable that the following conditional expression (23) be satisfied instead of conditional expression (23).
1.2<L1/L1air<3.0(23)
(240) It is more preferable that the following conditional expression (23) be satisfied instead of conditional expression (23).
1.3<L1/L1air<2.5(23)
(241) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (24) be satisfied:
1.1<L2/L2air<20.0(24)
(242) where,
(243) L2 denotes the thickness on the optical axis of the second lens unit, and
(244) L2air denotes a sum total of an air space on the optical axis in the second lens unit.
(245) In conditional expression (24), a ratio of the thickness of the second lens unit and the sum total of the air space in the second lens unit is used.
(246) By exceeding a lower limit value of conditional expression (24), it is possible to suppress an increase in the air space in the second lens unit. As a result, it is possible to correct the spherical aberration and the coma favorably while small-sizing the second lens unit.
(247) By a value falling below an upper limit value of conditional expression (24), it is possible to provide an appropriate air space in the second lens unit. As a result, it is possible to suppress an occurrence of the coma while small-sizing the second lens unit.
(248) It is preferable that the following conditional expression (24) be satisfied instead of conditional expression (24).
1.6<L2/L2air<18.0(24)
(249) It is more preferable that the following conditional expression (24) be satisfied instead of conditional expression (24).
1.8<L2/L2air<17.0(24)
(250) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (25) be satisfied:
0.60<f1/L12airw<0.20(25)
(251) where,
(252) L12airw denotes an air space between the first lens unit and the second lens unit at the wide angle end, and
(253) f1 denotes the focal length of the first lens unit.
(254) In conditional expression (25), a ratio of the focal length of the first lens unit and the predetermined air space at the wide angle end is used.
(255) By exceeding a lower limit value of conditional expression (25), it is possible to make the refractive power of the first lens unit large. Consequently, it is possible to make the angle of view wide. Moreover, since it is possible to widen the air space between the first lens unit and the second lens unit, it is possible to secure a high zooming ratio.
(256) By a value falling below an upper limit value of conditional expression (25), the air space between the first lens unit and the second lens unit is suppressed from being widened at the wide angle end. Consequently, it is possible to shorten the overall length of the optical system. Moreover, since widening of the air space between the first lens unit and the second lens unit is suppressed, it is possible to suppress an increase in the height of an axial light ray that passes through the second lens unit. As a result, it is possible to suppress an occurrence of the spherical aberration.
(257) It is preferable that the following conditional expression (25) be satisfied instead of conditional expression (25).
0.50<f1/L12airw<0.25(25)
(258) It is more preferable that the following conditional expression (25) be satisfied instead of conditional expression (25).
0.42<f1/L12airw<0.30(25)
(259) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (26) be satisfied:
0.30<f2/L12airw<0.70(26)
(260) where,
(261) L12airw denotes the air space between the first lens unit and the second lens unit at the wide angle end,
(262) f2 denotes the focal length of the second lens unit.
(263) In conditional expression (26), a ratio of the focal length of the second lens unit and the predetermined space at the wide angle end is used.
(264) By exceeding a lower limit value of conditional expression (26), the air space between the first lens unit and the second lens unit is suppressed from being widened at the wide angle end. Consequently, it is possible to shorten the overall length of the optical system. Moreover, since widening of the air space between the first lens unit and the second lens unit is suppressed, it is possible to suppress an increase in the height of an axial light ray that passes through the second lens unit. As a result, it is possible to suppress an occurrence of the spherical aberration.
(265) By a value falling below a lower limit value of conditional expression (26), the second lens unit does not become excessively small. Consequently, it is possible to correct the spherical aberration. Moreover, since it is possible to widen the air space between the first lens unit and the second lens unit, it is possible to secure a high zooming ratio.
(266) It is preferable that the following conditional expression (26) be satisfied instead of conditional expression (26).
0.32<f2/L12airw<0.60(26)
(267) It is more preferable that the following conditional expression (26) be satisfied instead of conditional expression (26).
0.33<f2/L12airw<0.56(26)
(268) In the zoom lens of the present embodiment, it is preferable that the first lens unit include a plurality of lenses, and the plurality of lenses include at least two negative lenses and one positive lens.
(269) By making such arrangement, it is possible to correct the astigmatism and the chromatic aberration of magnification which occur at the wide angle end, and the longitudinal chromatic aberration which occurs at the telephoto end.
(270) In the zoom lens of the present embodiment, it is preferable that the second lens unit include an object-side lens component and an image-side lens component, and the following conditional expression (27) be satisfied:
0.5<f2f/f2b<9(27)
(271) where,
(272) f2f denotes a focal length of the object-side lens component, and
(273) f2b denotes a focal length of an image-side lens component, and here,
(274) the lens component is one of a single lens and a cemented lens.
(275) In conditional expression (27), a ratio of the focal length of the object-side lens component and the focal length of the image-side lens component is used. By satisfying conditional expression (27), it is possible to correct the spherical aberration and the coma.
(276) It is preferable that the following conditional expression (27) be satisfied instead of conditional expression (27).
0.4<f2f/f2b<8(27)
(277) It is more preferable that the following conditional expression (27) be satisfied instead of conditional expression (27).
0.3<f2f/f2b<7(27)
(278) In the zoom lens of the present embodiment, it is preferable that the first lens unit move from the object side to the image side only, at the time of zooming.
(279) By making such arrangement, the movement of the lens unit at the time of zooming becomes a monotonous movement. Consequently, it is possible to simplify a mechanism that moves the lens unit, and moreover, it is possible to make the control of the movement easy.
(280) The first lens unit can also move toward the object side after moving from the object side to the image side at the time of zooming.
(281) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (28) be satisfied:
80%<DTw<8%(28)
(282) where,
(283) DTw denotes an amount of distortion at the maximum image height at the wide angle end.
(284) By satisfying conditional expression (28), it is possible to make a diameter of the first lens unit small. Moreover, it is possible to secure a wide angle of view.
(285) It is preferable that the following conditional expression (28) be satisfied instead of conditional expression (28).
75%<DTw<15%(28)
(286) It is more preferable that the following conditional expression (28) be satisfied instead of conditional expression (28).
70%<DTw<20%(28)
(287) In the zoom lens of the present embodiment, it is preferable that the third lens unit include one negative lens, and the fourth lens unit include one positive lens, and the following conditional expressions (29), (30), and (31) be satisfied:
nd3<1.7(29)
nd4<1.7(30)
|d3d4|<33(31)
(288) where,
(289) nd3 denotes a refractive index for a d-line of the negative lens in the third lens unit,
(290) d3 denotes Abbe number for the negative lens in the third lens unit,
(291) nd4 denotes a refractive index for the d-line of the positive lens in the fourth lens unit, and
(292) d4 denotes Abbe number for the positive lens in the fourth lens unit.
(293) By satisfying conditional expressions (29) and (30), it is possible to suppress both the refractive index of the negative lens (hereinafter, referred to as third lens) in the third lens unit and the refractive index of the positive lens (hereinafter, referred to as fourth lens) in the fourth lens unit from becoming excessively high. As a result, even when decentering occurs between the third lens and the fourth lens, it is possible to suppress a degradation of imaging performance due to decentering.
(294) Moreover, since it is possible to suppress the degradation of imaging performance due to decentering, manufacturing of a lens unit becomes easy and also it is possible to make the lens unit compact. A lens unit includes a zoom lens and a lens barrel.
(295) Moreover, since it is possible to suppress the degradation of imaging performance due to decentering, it is possible to bring the third lens and the fourth lens closer. Consequently, it is possible to make the optical system compact.
(296) By satisfying conditional expression (31), it is possible to correct favorably the chromatic aberration that occurs in the third lens unit. Consequently, it is possible to reduce a load of aberration correction on a predetermined lens unit. As a result, it is possible to form a compact optical system.
(297) It is preferable that the following conditional expression (29) be satisfied instead of conditional expression (29).
nd3<1.67(29)
(298) It is more preferable that the following conditional expression (29) be satisfied instead of conditional expression (29).
nd3<1.64(29)
(299) It is preferable that the following conditional expression (30) be satisfied instead of conditional expression (30).
nd4<1.60(30)
(300) It is more preferable that the following conditional expression (30) be satisfied instead of conditional expression (30).
nd4<1.55(30)
(301) Moreover, it is preferable that both nd3 and nd4 exceed 1.5, as it is easy to suppress an aberration of the respective lenses.
(302) It is preferable that the following conditional expression (31) be satisfied instead of conditional expression (31).
|d3d4|<32.0(31)
(303) It is more preferable that the following conditional expression (31) be satisfied instead of conditional expression (31).
|d3d4|<10(31)
(304) In the zoom lens of the present embodiment, it is preferable that the second lens unit include a negative lens, and an object-side surface of the negative lens in the second lens unit is convex toward the object side.
(305) By making such arrangement, it is possible to correct the spherical aberration. As a result, it is possible to secure a high imaging performance from the wide angle end up to the telephoto end.
(306) In the zoom lens of the present embodiment, it is preferable that the second lens unit include in order from the object side, a positive lens and a cemented lens, and the cemented lens includes a negative lens and a positive lens, and an object-side surface of the negative lens in the cemented lens is convex toward the object side.
(307) By disposing the positive lens on the object side, it is possible to lower a height of a light ray incident on the cemented lens. Consequently, it is possible to correct the spherical aberration and the coma effectively by the negative lens in the cemented lens. Moreover, it is possible to correct the chromatic aberration by the cemented lens. Consequently, it is possible to secure a high imaging performance from the wide angle end up to the telephoto end.
(308) In the zoom lens of the present embodiment, it is preferable that the following conditional expression (32) be satisfied:
35<Lt/(ytan 2w)<2(32)
(309) where,
(310) Lt denotes the overall length of the zoom lens at the telephoto end,
(311) y denotes the maximum image height at an image forming surface in the zoom lens, and
(312) w denotes the half angle of view at the wide angle end of the zoom lens, and here
(313) the overall length is a distance from a lens surface nearest to object up to a paraxial image plane, and is a distance in a case in which no air conversion is carried out.
(314) Conditional expression (32) is a conditional expression related to the overall length of the zoom lens. In conditional expression (32), the overall length of the zoom lens is normalized by the maximum image height of the image forming surface in the zoom lens, and a result of normalization is divided further by a tangent of the angle of view of the zoom lens.
(315) By exceeding a lower limit value of conditional expression (32), it is possible to suppress an increase in the overall length of the zoom lens at the telephoto end. As a result, it is possible to make the zoom lens compact. By a value falling below an upper limit value of conditional expression (32), it is possible to secure a wide angle of view at the wide angle end.
(316) It is preferable that the following conditional expression (32) be satisfied instead of conditional expression (32).
30<Lt/(ytan 2w)<3(32)
(317) It is more preferable that the following conditional expression (32) be satisfied instead of conditional expression (32).
24<Lt/(ytan 2w)<4(32)
(318) An image pickup apparatus of the present embodiment includes the abovementioned zoom lens, and an image pickup element which converts an image formed by the zoom lens to an electric signal.
(319) According to the image pickup apparatus of the present embodiment, it is possible to achieve a wide angle image with a high resolution, while the image pickup apparatus being small-sized.
(320) The abovementioned zoom lens and the image pickup apparatus may satisfy a plurality of arrangements simultaneously. Making such arrangement is preferable for achieving a favorable zoom lens and image pickup apparatus. Moreover, combinations of preferable arrangements are arbitrary. For each conditional expression, only the upper limit value or the lower limit value of a numerical range of a conditional expression further restricted, may be limited.
(321) Examples of zoom lenses will be described below in detail by referring to the accompanying diagrams. However, the present invention is not restricted to the examples described below.
(322) Lens cross-sectional views of each example will be described below.
(323)
(324)
(325)
(326) Aberration diagrams of each example will be described below.
(327)
(328)
(329)
(330)
(331)
(332)
(333)
(334)
(335)
(336)
(337)
(338)
(339) The lens cross-sectional views are lens cross-sectional views at the time of focusing to an object at infinity. The aberration diagrams are aberration diagrams at the time of focusing to the object at infinity.
(340) A first lens unit is denoted by G1, a second lens unit is denoted by G2, a third lens unit is denoted by G3, a fourth lens unit is denoted by G4, a fifth lens unit is denoted by G5, an aperture stop is denoted by S, and an image plane (image pickup surface) is denoted by I. Moreover, a cover glass C1 and a cover glass C2 are disposed between the fourth lens unit G4 and the image plane I or between the fifth lens unit G5 and the image plane I.
(341) A zoom lens of an example 1 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(342) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(343) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(344) The third lens unit G3 includes a biconcave negative lens L7.
(345) The fourth lens unit G4 includes a biconvex positive lens L8.
(346) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(347) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(348) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L4, both surfaces of the biconcave negative lens L7, and both surfaces of the biconvex positive lens L8.
(349) A zoom lens of an example 2 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(350) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(351) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(352) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(353) The fourth lens unit G4 includes a biconvex positive lens L8.
(354) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward an object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(355) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(356) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the biconvex positive lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(357) A zoom lens of an example 3 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(358) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(359) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(360) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(361) The fourth lens unit G4 includes a biconvex positive lens L8.
(362) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(363) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(364) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(365) A zoom lens of an example 4 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(366) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(367) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(368) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(369) The fourth lens unit G4 includes a positive meniscus lens L8 having a convex surface directed toward the object side.
(370) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(371) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(372) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the positive meniscus lens L8.
(373) A zoom lens of an example 5 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(374) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(375) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(376) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(377) The fourth lens unit G4 includes a positive meniscus lens L8 having a convex surface directed toward the object side.
(378) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(379) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(380) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the positive meniscus lens L8.
(381) A zoom lens of an example 6 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(382) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(383) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(384) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(385) The fourth lens unit G4 includes a biconvex positive lens L8.
(386) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3 moves toward the object side, and the fourth lens unit G4 is fixed.
(387) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(388) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(389) A zoom lens of an example 7 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(390) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(391) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(392) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(393) The fourth lens unit G4 includes a positive meniscus lens L8 having a convex surface directed toward an image side.
(394) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the image side, moves toward the object side, and the fourth lens unit G4 is fixed.
(395) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(396) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the positive meniscus lens L8.
(397) A zoom lens of an example 8 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(398) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(399) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(400) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(401) The fourth lens unit G4 includes a biconvex positive lens L8.
(402) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1, after moving toward an image side, moves toward the object side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(403) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(404) An aspheric surface is provided to a total of eight surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(405) A zoom lens of an example 9 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(406) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(407) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(408) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(409) The fourth lens unit G4 includes a biconvex positive lens L8.
(410) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, a second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(411) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(412) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(413) A zoom lens of an example 10 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(414) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(415) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(416) The third lens unit G3 includes a biconcave negative lens L7.
(417) The fourth lens unit G4 includes a biconvex positive lens L8.
(418) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(419) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(420) An aspheric surface is provided to a total of eight surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L4, both surfaces of the biconcave negative lens L7, and both surfaces of the biconvex positive lens L8.
(421) A zoom lens of an example 11 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(422) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(423) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(424) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(425) The fourth lens unit G4 includes a positive meniscus lens L8 having a convex surface directed toward an image side.
(426) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3 moves toward the object side, and the fourth lens unit G4 is fixed.
(427) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(428) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the positive meniscus lens L8.
(429) A zoom lens of an example 12 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(430) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(431) The second lens unit G2 includes a biconvex positive lens L4, a positive meniscus lens L5 having a convex surface directed toward the object side, a negative meniscus lens L6 having a convex surface directed toward the object side, and a biconvex positive lens L7. Here, the positive meniscus lens L5 and the negative meniscus lens L6 are cemented.
(432) The third lens unit G3 includes a negative meniscus lens L8 having a convex surface directed toward the object side.
(433) The fourth lens unit G4 includes a biconvex positive lens L9.
(434) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3 moves toward the object side, and the fourth lens unit G4 is fixed.
(435) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(436) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the biconvex positive lens L4, both surfaces of the negative meniscus lens L8, and both surfaces of the biconvex positive lens L9.
(437) A zoom lens of an example 13 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(438) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(439) The second lens unit G2 includes a biconvex positive lens L4, a biconvex positive lens L5, a negative meniscus lens L6 having a convex surface directed toward the object side, and a biconvex positive lens L7. Here, the negative meniscus lens L6 and the biconvex positive lens L7 are cemented.
(440) The third lens unit G3 includes a biconcave negative lens L8.
(441) The fourth lens unit G4 includes a positive meniscus lens L9 having a convex surface directed toward an image side.
(442) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(443) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(444) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L4, both surfaces of the biconcave negative lens L8, and both surfaces of the positive meniscus lens L9.
(445) A zoom lens of an example 14 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(446) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(447) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a biconvex positive lens L5, and a negative meniscus lens L6 having a convex surface directed toward an image side. Here, the biconvex positive lens L5 and the negative meniscus lens L6 are cemented.
(448) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(449) The fourth lens unit G4 includes a biconvex positive lens L8.
(450) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(451) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(452) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(453) A zoom lens of an example 15 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(454) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(455) The second lens unit G2 includes a biconvex positive lens L4, a biconcave negative lens L5, and a biconvex positive lens L6. Here, the biconvex positive lens L4 and the biconcave negative lens L5 are cemented.
(456) The third lens unit G3 includes a biconcave negative lens L7.
(457) The fourth lens unit G4 includes a biconvex positive lens L8.
(458) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3 moves toward the object side, and the fourth lens unit G4 is fixed.
(459) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(460) An aspheric surface is provided to a total of seven surfaces which are, an object-side surface of the biconvex positive lens L4, both surfaces of the biconvex positive lens L6, both surfaces of the biconcave negative lens L7, and both surfaces of the biconvex positive lens L8.
(461) A zoom lens of an example 16 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, a fourth lens unit G4 having a positive refractive power, and a fifth lens unit G5 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(462) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a biconvex positive lens L3.
(463) The second lens unit G2 includes a positive meniscus lens L4 having a convex surface directed toward the object side, a negative meniscus lens L5 having a convex surface directed toward an image side, and a biconvex positive lens L6. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(464) The third lens unit G3 includes a negative meniscus lens L7 having a convex surface directed toward the object side.
(465) The fourth lens unit G4 includes a biconvex positive lens L8.
(466) The fifth lens unit G5 includes a biconvex positive lens L9.
(467) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3 moves toward the object side, the fourth lens unit G4, after moving toward the object side, moves toward the image side, and the fifth lens unit G5 is fixed.
(468) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(469) An aspheric surface is provided to a total of 10 surfaces which are, both surfaces of the biconcave negative lens L2, both surfaces of the biconvex positive lens L3, both surfaces of the positive meniscus lens L4, both surfaces of the negative meniscus lens L7, and both surfaces of the biconvex positive lens L8.
(470) A zoom lens of an example 17 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(471) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, and a positive meniscus lens L3 having a convex surface directed toward the object side.
(472) The second lens unit G2 includes a biconvex positive lens L4, a negative meniscus lens L5 having a convex surface directed toward the object side, a biconvex positive lens L6, and a biconvex positive lens L7. Here, the negative meniscus lens L5 and the biconvex positive lens L6 are cemented.
(473) The third lens unit G3 includes a biconcave negative lens 8.
(474) The fourth lens unit G4 includes a biconvex positive lens L9.
(475) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward an image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(476) At a time of focusing from an object at infinity to an object at a close distance, the third lens unit G3 moves toward the image side.
(477) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L4, both surfaces of the biconcave negative lens L8, and both surfaces of the biconvex positive lens L9.
(478) A zoom lens of an example 18 includes in order from an object side, a first lens unit G1 having a negative refractive power, a second lens unit G2 having a positive refractive power, a third lens unit G3 having a negative refractive power, and a fourth lens unit G4 having a positive refractive power. An aperture stop S is disposed between the first lens unit G1 and the second lens unit G2.
(479) The first lens unit G1 includes a negative meniscus lens L1 having a convex surface directed toward the object side, a biconcave negative lens L2, a positive meniscus lens L3 having a convex surface directed toward the object side, and a negative meniscus lens L4 having a convex surface directed toward an image side.
(480) The second lens unit G2 includes a biconvex positive lens L5, a negative meniscus lens L6 having a convex surface directed toward the object side, and a biconvex positive lens L7. Here, the negative meniscus lens L6 and the biconvex positive lens L7 are cemented.
(481) The third lens unit G3 includes a biconcave negative lens L8.
(482) The fourth lens unit G4 includes a biconvex positive lens L9.
(483) At a time of zooming from a wide angle end to a telephoto end, the first lens unit G1 moves toward the image side, the second lens unit G2 moves toward the object side, the third lens unit G3, after moving toward the object side, moves toward the image side, and the fourth lens unit G4 is fixed.
(484) At a time of focusing from an object at infinity to an object at a close distance, the negative meniscus lens L4 in the first lens unit G1 moves toward the object side.
(485) An aspheric surface is provided to a total of six surfaces which are, both surfaces of the biconvex positive lens L5, both surfaces of the biconcave negative lens L8, and both surfaces of the biconvex positive lens L9.
(486) Numerical data of each example described above is shown below. In Surface data, r denotes radius of curvature of each lens surface, d denotes a distance between respective lens surfaces, nd denotes a refractive index of each lens for a d-line, d denotes an Abbe number for each lens and *denotes an aspherical surface.
(487) In Zoom data, WE denotes a wide angle end, ST denotes a intermediate focal length state, TE denotes a telephoto end. f denotes a focal length of the entire system, FNO. denotes an F number, denotes a half angle of view, IH denotes an image height, BF denotes a back focus, LTL denotes a lens total length of the optical system. Further, back focus is a unit which is expressed upon air conversion of a distance from a rearmost lens surface to a paraxial image surface. The lens total length is a distance from a frontmost lens surface to the rearmost lens surface plus back focus. In Unit focal length, each of f1, f2 . . . is a focal length of each lens unit.
(488) A shape of an aspherical surface is defined by the following expression where the direction of the optical axis is represented by z, the direction orthogonal to the optical axis is represented by y, a conical coefficient is represented by K, aspherical surface coefficients are represented by A4, A6, A8, A10, A12 . . .
Z=(y.sup.2/r)/[1+{1(1+k)(y/r).sup.2}.sup.1/2]+A4y.sup.4+A6y.sup.6+A8y.sup.8+A10y.sup.10+A12y.sup.12+ . . .
(489) Further, in the aspherical surface coefficients, e-n (where, n is an integral number) indicates 10.sup.n. Moreover, these symbols are commonly used in the following numerical data for each example.
Example 1
(490) TABLE-US-00001 Unit mm Surface data Surface no. r d nd d Object plane 1 115.244 1.20 1.81600 46.62 2 9.050 6.46 3 26.934 1.00 1.65160 58.55 4 21.191 1.50 5 20.344 2.50 1.89286 20.36 6 65.066 Variable 7(Stop) 0.50 8* 8.865 3.58 1.74320 49.34 9* 37.387 0.97 10 21.431 0.80 2.00100 29.13 11 6.094 4.05 1.43875 94.66 12 11.401 Variable 13* 39.154 0.80 1.53071 55.69 14* 14.001 Variable 15* 15.009 1.50 1.53071 55.69 16* 66.936 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 8th surface k = 0.073 A4 = 1.15189e04, A6 = 1.85692e07, A8 = 4.07128e09 9th surface k = 0.000 A4 = 2.30009e04, A6 = 4.84996e07, A8 = 2.84944e09 13th surface k = 0.000 A4 = 2.82008e04, A6 = 2.32231e05 14th surface k = 0.000 A4 = 7.12837e04, A6 = 2.19498e05 15th surface k = 0.000 A4 = 3.52012e04, A6 = 2.50287e05 16th surface k = 0.000 A4 = 3.52271e04, A6 = 4.65822e06 Zoom data Zoom ratio 3.50 WE ST TE f 3.53 7.01 12.35 FNO. 1.85 2.29 2.94 2 148.07 62.08 34.57 IH 4.01 4.01 4.01 BF(in air) 3.73 3.73 3.73 LTL(in air) 59.37 47.17 45.25 d6 24.98 8.93 1.51 d12 2.20 5.48 11.28 d14 3.60 4.17 3.87 Unit focal length f1 = 8.73 f2 = 11.08 f3 = 19.33 f4 = 23.25
Example 2
(491) TABLE-US-00002 Unit mm Surface data Surface no. r d nd d Object plane 1 85.638 1.40 1.65160 58.55 2 8.000 6.88 3* 40.057 1.60 1.53071 55.69 4* 8.000 2.16 5* 23.822 2.45 1.63493 23.89 6* 66.569 Variable 7 (Stop) 0.50 8* 9.546 2.56 1.85400 40.39 9* 598.662 1.55 10 17.341 0.85 2.00069 25.46 11 5.756 4.39 1.45650 90.27 12 14.055 Variable 13* 85.891 0.85 1.53071 55.69 14* 9.071 Variable 15* 13.277 2.86 1.53071 55.69 16* 13.247 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 7.67638e05, A6 = 2.50591e06 4th surface k = 0.128 A4 = 2.48684e04, A6 = 7.24288e06 5th surface k = 0.000 A4 = 9.65078e06, A6 = 2.91069e06 6th surface k = 0.000 A4 = 6.27705e05, A6 = 1.97747e06 8th surface k = 0.000 A4 = 4.20754e05, A6 = 1.60369e08 9th surface k = 0.000 A4 = 1.38009e04, A6 = 5.03704e08 13th surface k = 0.000 A4 = 1.15901e03, A6 = 1.53246e05 14th surface k = 0.000 A4 = 1.06286e03, A6 = 7.08004e06 15th surface k = 0.000 A4 = 3.75300e04, A6 = 7.09008e10 16th surface k = 0.000 A4 = 1.15059e03, A6 = 9.39135e06, A8 = 9.13311e08 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.01 FNO. 1.84 2.46 3.27 2 131.97 66.67 35.37 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 53.86 52.16 d6 21.38 9.93 1.50 d12 2.40 4.14 11.69 d14 3.80 8.01 7.19 Unit focal length f1 = 8.09 f2 = 11.87 f3 = 19.18 f4 = 12.98
Example 3
(492) TABLE-US-00003 Unit mm Surface data Surface no. r d nd d Object plane 1 106.833 1.40 1.72916 54.68 2 10.000 5.71 3* 37.476 1.60 1.53071 55.69 4* 8.700 2.55 5* 25.907 2.74 1.63493 23.89 6* 77.885 Variable 7 (Stop) 0.50 8* 7.666 2.44 1.85400 40.39 9* 238.702 0.98 10 25.110 0.85 2.00100 29.13 11 4.842 3.72 1.49700 81.61 12 13.399 Variable 13* 459.996 0.85 1.53071 55.69 14* 13.913 Variable 15* 12.918 1.65 1.53071 55.69 16* 71.557 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 1.21078e04, A6 = 1.49989e06 4th surface k = 1.505 A4 = 3.64113e04, A6 = 4.31785e06 5th surface k = 0.000 A4 = 1.44294e04, A6 = 2.58598e06 6th surface k = 0.000 A4 = 1.44117e05, A6 = 1.92182e06 8th surface k = 0.000 A4 = 7.74716e05, A6 = 1.84248e07 9th surface k = 0.000 A4 = 1.84935e04, A6 = 1.05261e07 13th surface k = 0.000 A4 = 5.44665e04, A6 = 2.08158e05 14th surface k = 0.000 A4 = 3.75204e04, A6 = 1.15393e05 15th surface k = 0.000 A4 = 1.32007e03, A6 = 2.07288e05 16th surface k = 0.000 A4 = 2.10795e03, A6 = 4.52739e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.00 FNO. 2.03 2.60 3.43 2 131.02 66.67 35.30 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 49.97 46.97 d6 24.44 10.56 1.50 d12 2.40 4.04 11.28 d14 3.80 6.65 5.47 Unit focal length f1 = 9.08 f2 = 11.64 f3 = 27.05 f4 = 20.76
Example 4
(493) TABLE-US-00004 Unit mm Surface data Surface no. r d nd d Object plane 1 32.210 1.20 1.88300 40.76 2 9.749 6.76 3 27.638 1.00 1.72916 54.68 4 12.398 2.00 5 16.137 3.00 1.92286 18.90 6 41.450 Variable 7 (Stop) 0.50 8* 8.128 3.56 1.74320 49.34 9* 69.100 0.63 10 32.311 0.80 1.90366 31.32 11 5.463 3.62 1.49700 81.61 12 12.006 Variable 13* 10.924 0.80 1.53071 55.69 14* 5.518 Variable 15* 9.201 1.39 1.53071 55.69 16* 39.826 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 8th surface k = 0.000 A4 = 1.02723e04, A6 = 9.19949e08 9th surface k = 0.000 A4 = 2.76596e04, A6 = 2.31887e08 13th surface k = 0.000 A4 = 3.31698e03, A6 = 9.95905e05 14th surface k = 0.000 A4 = 4.38301e03, A6 = 8.45256e05 15th surface k = 0.000 A4 = 1.64846e03, A6 = 2.56048e05 16th surface k = 0.000 A4 = 2.87943e03, A6 = 6.70306e06 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.01 FNO. 2.02 2.50 3.32 2 135.29 66.67 35.29 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 57.34 48.10 47.32 d6 22.16 9.10 1.66 d12 2.40 5.59 12.89 d14 3.80 4.42 3.80 Unit focal length f1 = 8.12 f2 = 10.97 f3 = 22.14 f4 = 22.20
Example 5
(494) TABLE-US-00005 Unit mm Surface data Surface no. r d nd d Object plane 1 31.592 1.20 1.88300 40.76 2 9.004 7.06 3 37.634 1.00 1.72916 54.68 4 14.488 2.00 5 16.122 3.00 1.92286 18.90 6 35.733 Variable 7 (Stop) 0.50 8 7.403 3.27 1.74320 49.34 9 172.057 0.73 10 22.593 0.80 1.90366 31.32 11 5.000 2.30 1.49700 81.61 12 12.266 Variable 13* 10.749 0.80 1.53071 55.69 14* 5.400 Variable 15* 10.027 1.31 1.53071 55.69 16* 35.824 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 8th surface k = 0.000 A4 = 9.13858e05, A6 = 4.53390e07 9th surface k = 0.000 A4 = 3.47611e04, A6 = 1.46303e06 13th surface k = 0.000 A4 = 2.75651e03, A6 = 9.67312e05 14th surface k = 0.000 A4 = 3.71920e03, A6 = 8.13209e05 15th surface k = 0.000 A4 = 1.42758e03, A6 = 3.35558e05 16th surface k = 0.000 A4 = 2.45893e03, A6 = 1.97898e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.00 FNO. 2.83 3.46 4.58 2 131.21 66.67 35.31 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 57.11 46.51 44.78 d6 23.15 9.21 1.50 d12 2.45 5.46 11.78 d14 3.81 4.13 3.80 Unit focal length f1 = 8.52 f2 = 10.63 f3 = 21.56 f4 = 25.78
Example 6
(495) TABLE-US-00006 Unit mm Surface data Surface no. r d nd d Object plane 1 46.340 1.40 1.71300 53.87 2 10.000 6.17 3* 19.848 1.60 1.53071 55.69 4* 8.700 3.80 5* 25.370 2.35 1.63493 23.89 6* 89.673 Variable 7 (Stop) 0.50 8* 8.834 2.13 1.88202 37.22 9* 20622.747 1.65 10 23.060 0.85 2.00069 25.46 11 5.250 2.92 1.49700 81.61 12 15.362 Variable 13* 73.314 0.85 1.53071 55.69 14* 7.920 Variable 15* 11.114 3.39 1.53071 55.69 16* 14.804 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 4.56048e04, A6 = 5.44367e06, A8 = 1.69494e08 4th surface k = 4.840 A4 = 7.37515e04, A6 = 7.59233e06 5th surface k = 0.000 A4 = 1.80249e04, A6 = 2.13372e06, A8 = 2.16895e08 6th surface k = 0.000 A4 = 9.89379e05, A6 = 3.96257e06, A8 = 3.46357e08 8th surface k = 0.000 A4 = 7.44920e05, A6 = 1.94917e07 9th surface k = 0.000 A4 = 1.11034e04, A6 = 5.22796e08 13th surface k = 0.000 A4 = 3.89309e04, A6 = 3.21633e05 14th surface k = 0.000 A4 = 2.64558e04, A6 = 2.72722e05 15th surface k = 0.000 A4 = 3.35144e04, A6 = 1.62953e06 16th surface k = 0.000 A4 = 1.24088e03, A6 = 1.27103e05 Zoom data Zoom ratio 4.00 WE ST TE f 3.43 6.86 13.72 FNO. 2.84 3.72 4.54 2 117.06 61.46 31.11 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 61.87 56.68 54.60 d6 24.27 11.30 1.50 d12 2.45 3.25 8.80 d14 3.80 10.78 12.95 Unit focal length f1 = 9.20 f2 = 11.83 f3 = 16.81 f4 = 12.53
Example 7
(496) TABLE-US-00007 Unit mm Surface data Surface no. r d nd d Object plane 1 89.498 1.40 1.72916 54.68 2 10.000 6.04 3* 28.721 1.60 1.53071 55.69 4* 8.700 2.79 5* 31.921 2.45 1.63493 23.89 6* 69.187 Variable 7 (Stop) 0.50 8* 7.489 3.04 1.85400 40.39 9* 24.742 0.87 10 15.833 0.85 2.00100 29.13 11 5.017 2.95 1.49700 81.61 12 12.873 Variable 13* 7.997 0.85 1.63493 23.89 14* 5.400 Variable 15* 15.529 2.58 1.53071 55.69 16* 6.005 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 2.76663e05, A6 = 2.34322e07 4th surface k = 2.241 A4 = 6.93114e05, A6 = 3.90561e07 5th surface k = 0.000 A4 = 1.43731e04, A6 = 5.92569e07 6th surface k = 0.000 A4 = 1.71791e04, A6 = 1.00157e06 8th surface k = 0.000 A4 = 4.00937e05, A6 = 5.29683e07 9th surface k = 0.000 A4 = 3.15199e04, A6 = 1.75900e06 13th surface k = 0.000 A4 = 2.49260e03, A6 = 5.04733e05 14th surface k = 0.000 A4 = 3.91856e03, A6 = 5.55756e06 15th surface k = 0.000 A4 = 2.18143e03, A6 = 4.78440e05 16th surface k = 0.000 A4 = 2.96696e03, A6 = 7.94123e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.00 FNO. 2.51 3.09 4.22 2 134.32 66.67 35.29 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 48.97 48.85 d6 23.24 8.98 1.50 d12 2.52 6.65 13.91 d14 3.95 3.69 3.80 Unit focal length f1 = 8.30 f2 = 11.68 f3 = 30.00 f4 = 16.86
Example 8
(497) TABLE-US-00008 Unit mm Surface data Surface no. r d nd d Object plane 1 23.542 1.40 1.85150 40.78 2 10.000 6.46 3* 25.270 1.40 1.58313 59.38 4* 8.700 3.48 5 17.547 1.86 1.92286 18.90 6 38.166 Variable 7 (Stop) 0.50 8* 8.002 2.81 1.74320 49.34 9* 64.968 1.51 10 53.322 0.85 1.90366 31.32 11 5.167 2.50 1.49700 81.61 12 13.919 Variable 13* 10.225 0.85 1.53071 55.69 14* 6.020 Variable 15* 10.679 2.19 1.53071 55.69 16* 48.044 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 4.35939e04, A6 = 7.45935e06, A8 = 4.42850e08 4th surface k = 0.000 A4 = 1.70613e04, A6 = 2.51674e06, A8 = 2.21655e07, A10 = 2.75944e09 8th surface k = 0.000 A4 = 1.32021e04, A6 = 7.14849e07 9th surface k = 0.000 A4 = 1.52985e04, A6 = 1.41879e06 13th surface k = 0.000 A4 = 2.25996e03, A6 = 6.34913e05 14th surface k = 0.000 A4 = 2.72435e03, A6 = 5.56598e05 15th surface k = 0.000 A4 = 7.74350e04, A6 = 2.83005e06 16th surface k = 0.000 A4 = 1.66781e03, A6 = 1.33649e05 Zoom data Zoom ratio 4.00 WE ST TE f 3.43 6.86 13.72 FNO. 2.86 3.83 4.55 2 116.70 61.20 31.11 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 51.47 52.04 d6 23.62 10.01 1.50 d12 2.40 5.05 17.21 d14 3.80 6.87 3.80 Unit focal length f1 = 8.85 f2 = 12.07 f3 = 29.66 f4 = 16.68
Example 9
(498) TABLE-US-00009 Unit mm Surface data Surface no. r d nd d Object plane 1 144.104 1.40 1.72916 54.68 2 11.000 5.22 3* 82.207 1.80 1.53071 55.69 4* 9.000 2.52 5* 91.792 2.59 1.63493 23.89 6* 28.650 Variable 7 (Stop) 0.50 8* 9.855 1.13 1.80610 40.92 9* 59.022 2.98 10 18.257 0.85 1.84666 23.78 11 6.398 2.04 1.49700 81.61 12 19.162 Variable 13* 8.713 0.85 1.53071 55.69 14* 5.400 Variable 15* 8.814 2.22 1.53071 55.69 16* 552.033 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 3.98119e05, A6 = 2.21344e07 4th surface k = 2.514 5th surface k = 0.000 A4 = 9.08045e05, A6 = 2.86969e07 6th surface k = 0.000 A4 = 5.84778e05, A6 = 1.90485e07 8th surface k = 0.000 A4 = 5.38736e05, A6 = 5.04820e06 9th surface k = 0.000 A4 = 7.00302e-05, A6 = 5.86825e06 13th surface k = 0.000 A4 = 1.52456e03, A6 = 2.65514e05 14th surface k = 0.000 A4 = 1.78340e03, A6 = 2.10737e05 15th surface k = 0.000 A4 = 6.59352e04, A6 = 9.52922e06 16th surface k = 0.000 A4 = 1.81712e03, A6 = 3.56457e05 Zoom data Zoom ratio 3.00 WE ST TE f 3.43 5.95 10.29 FNO. 2.86 3.50 4.18 2 116.84 70.36 40.72 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.37 49.96 44.39 d6 25.08 11.60 1.50 d12 2.42 3.67 11.27 d14 4.05 6.87 3.80 Unit focal length f1 = 10.51 f2 = 12.34 f3 = 29.37 f4 = 16.37
Example 10
(499) TABLE-US-00010 Unit mm Surface data Surface no. r d nd d Object plane 1 37.733 1.40 1.72916 54.68 2 10.000 6.61 3* 17.996 1.40 1.51633 64.14 4* 8.718 3.53 5 27.935 2.35 1.92119 23.96 6 2989.658 Variable 7 (Stop) 0.50 8* 7.813 1.72 1.74320 49.34 9* 47.682 1.83 10 106.097 0.85 1.90366 31.32 11 5.099 2.18 1.49700 81.61 12 12.959 Variable 13* 26.321 0.85 1.53071 55.69 14* 15.510 Variable 15* 7.059 3.12 1.53071 55.69 16* 35.043 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 2.01689e04, A6 = 2.08978e06, A8 = 9.67597e09 4th surface k = 0.000 A4 = 2.30002e04, A6 = 1.17596e06, A8 = 3.62207e08, A10 = 4.17707e11 8th surface k = 0.000 A4 = 1.25673e04, A6 = 1.12861e06 9th surface k = 0.000 A4 = 1.85728e04, A6 = 7.96554e07 13th surface k = 0.000 A4 = 3.58699e04, A6 = 3.62811e06 14th surface k = 0.000 A4 = 1.83054e04, A6 = 2.32460e06 15th surface k = 0.000 A4 = 9.59014e05, A6 = 2.81248e06 16th surface k = 0.000 A4 = 1.00937e03, A6 = 2.69905e06 Zoom data Zoom ratio 3.00 WE ST TE f 3.43 5.94 10.29 FNO. 2.86 3.46 4.40 2 116.42 69.69 40.72 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 49.95 47.27 d6 22.40 9.50 1.51 d12 2.40 5.49 11.89 d14 4.49 4.89 3.80 Unit focal length f1 = 9.36 f2 = 11.82 f3 = 18.26 f4 = 11.36
Example 11
(500) TABLE-US-00011 Unit mm Surface data Surface no. r d nd d Object plane 1 22.749 1.20 1.88300 40.76 2 9.390 6.66 3 118.406 1.00 1.72916 54.68 4 11.522 2.00 5 12.335 3.00 1.92286 18.90 6 18.475 Variable 7 (Stop) 0.50 8* 7.320 2.79 1.74320 49.34 9* 102.916 0.55 10 78.483 0.80 1.90366 31.32 11 6.581 2.17 1.49700 81.61 12 7.702 Variable 13* 224.796 0.80 1.53071 55.69 14* 5.400 Variable 15* 19.781 2.12 1.53071 55.69 16* 6.359 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 8th surface k = 0.000 A4 = 4.01494e06, A6 = 6.73338e06 9th surface k = 0.000 A4 = 8.60759e04, A6 = 1.07426e05 13th surface k = 0.000 A4 = 4.17582e04, A6 = 1.79774e05 14th surface k = 0.000 A4 = 6.37043e04, A6 = 4.44571e06 15th surface k = 0.000 A4 = 1.19565e03, A6 = 5.07009e05 16th surface k = 0.000 A4 = 4.27560e05, A6 = 3.17710e05 Zoom data Zoom ratio 3.00 WE ST TE f 3.75 6.50 11.25 FNO. 2.86 3.48 4.40 2 111.60 64.68 37.50 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.37 48.75 43.61 d6 25.85 12.73 4.33 d12 2.40 3.46 5.66 d14 3.80 5.24 6.30 Unit focal length f1 = 9.27 f2 = 8.94 f3 = 10.44 f4 = 16.74
Example 12
(501) TABLE-US-00012 Unit mm Surface data Surface no. r d nd d Object plane 1 58.579 1.40 1.88300 40.76 2 8.114 7.21 3* 41.844 1.60 1.53071 55.69 4* 13.885 0.64 5* 15.925 2.87 1.63493 23.89 6* 227.596 Variable 7 (Stop) 0.50 8* 8.586 2.78 1.80610 40.92 9 116.929 0.50 10 16.966 1.16 1.49700 81.61 11 61.817 0.85 2.00069 25.46 12 6.609 0.93 13 10.353 2.42 1.49700 81.61 14 14.058 Variable 15* 26.519 0.85 1.53071 55.69 16* 9.838 Variable 17* 28.275 1.74 1.53071 55.69 18* 19.701 1.50 19 1.30 1.51633 64.14 20 0.51 21 0.50 1.51633 64.14 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 3.54390e06, A6 = 1.37451e06 4th surface k = 0.526 A4 = 1.91391e04, A6 = 2.57397e06 5th surface k = 0.000 A4 = 2.07235e05, A6 = 1.60041e06 6th surface k = 0.000 A4 = 3.60689e06, A6 = 5.35381e07 8th surface k = 0.000 A4 = 8.24536e05, A6 = 9.67596e08 9th surface k = 0.000 A4 = 1.78575e04, A6 = 5.18006e08 15th surface k = 0.000 A4 = 3.29309e04, A6 = 1.55725e05 16th surface k = 0.000 A4 = 3.18108e04, A6 = 1.52037e05 17th surface k = 0.000 A4 = 1.91654e03, A6 = 2.97230e05 18th surface k = 0.000 A4 = 3.38105e03, A6 = 6.19130e05 Zoom data Zoom ratio 4.50 WE ST TE f 3.43 7.25 15.44 FNO. 2.24 3.09 4.49 2 145.61 59.89 27.80 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 65.81 54.66 52.97 d6 30.01 12.34 1.50 d14 2.82 3.00 9.44 d16 3.80 10.14 12.86 Unit focal length f1 = 9.99 f2 = 12.69 f3 = 30.00 f4 = 22.16
Example 13
(502) TABLE-US-00013 Unit mm Surface data Surface no. r d nd d Object plane 1 53.695 1.20 1.88300 40.76 2 10.937 6.07 3 25.633 1.00 1.72916 54.68 4 13.233 2.00 5 21.989 3.00 1.92286 18.90 6 111.962 Variable 7 (Stop) 0.50 8* 8.610 2.06 1.74320 49.34 9* 718.906 0.50 10 50.000 1.23 1.76200 40.10 11 40.515 0.50 12 95.054 0.80 1.90366 31.32 13 5.527 3.71 1.49700 81.61 14 12.217 Variable 15* 53.020 0.80 1.53071 55.69 16* 10.247 Variable 17* 51.479 1.91 1.53071 55.69 18* 8.306 1.50 19 1.30 1.51633 64.14 20 0.51 21 0.50 1.51633 64.14 22 0.53 Image plane Aspherical surface data 8th surface k = 0.000 A4 = 6.97907e05, A6 = 5.82419e07 9th surface k = 0.000 A4 = 2.51575e04, A6 = 8.13644e07 15th surface k = 0.000 A4 = 5.10191e04, A6 = 1.93625e05 16th surface k = 0.000 A4 = 2.47563e04, A6 = 2.06916e05 17th surface k = 0.000 A4 = 1.44970e04, A6 = 2.86550e05 18th surface k = 0.000 A4 = 8.43482e04, A6 = 2.88486e05 Zoom data Zoom ratio 4.50 WE ST TE f 3.43 7.35 15.43 FNO. 2.25 3.14 4.25 2 150.89 59.73 27.80 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 61.73 52.63 49.35 d6 26.52 11.48 1.50 d14 2.40 3.74 11.69 d16 3.80 8.40 7.15 Unit focal length f1 = 8.18 f2 = 10.82 f3 = 16.11 f4 = 18.38
Example 14
(503) TABLE-US-00014 Unit mm Surface data Surface no. r d nd d Object plane 1 211.945 1.40 1.72916 54.68 2 11.000 5.78 3* 67.202 1.80 1.53071 55.69 4* 9.000 1.50 5* 65.964 2.66 1.63493 23.89 6* 35.790 Variable 7 (Stop) 0.50 8* 10.649 1.04 1.80610 40.92 9* 30.116 4.33 10 17.725 1.91 1.49700 81.61 11 6.820 0.85 1.84666 23.78 12 11.265 Variable 13* 9.968 0.85 1.63493 23.89 14* 5.403 Variable 15* 8.844 3.11 1.53071 55.69 16* 26.337 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 1.21142e04, A6 = 1.10941e06 4th surface k = 3.965 5th surface k = 0.000 A4 = 4.03652e04, A6 = 1.57078e06 6th surface k = 0.000 A4 = 3.24777e04, A6 = 8.59601e07 8th surface k = 0.000 A4 = 1.30087e04, A6 = 1.77475e05 9th surface k = 0.000 A4 = 2.71861e04, A6 = 1.99568e05 13th surface k = 0.000 A4 = 1.17570e06, A6 = 4.06689e06 14th surface k = 0.000 A4 = 2.50517e04, A6 = 8.00783e07 15th surface k = 0.000 A4 = 7.39372e04, A6 = 8.75113e07 16th surface k = 0.000 A4 = 2.14589e03, A6 = 3.98353e05 Zoom data Zoom ratio 3.00 WE ST TE f 3.10 6.18 9.30 FNO. 2.63 3.30 3.63 2 126.32 68.67 45.09 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 59.36 49.45 45.84 d6 23.53 8.30 1.50 d12 2.57 4.98 10.03 d14 3.80 6.71 4.85 Unit focal length f1 = 9.22 f2 = 11.76 f3 = 20.03 f4 = 12.87
Example 15
(504) TABLE-US-00015 Unit mm Surface data Surface no. r d nd d Object plane 1 36.065 1.20 1.72916 54.68 2 10.081 7.38 3 41.358 1.00 1.64000 60.08 4 9.717 2.05 5 11.199 3.00 1.92286 18.90 6 16.774 Variable 7 (Stop) 0.50 8* 7.438 5.03 1.49700 81.61 9 7.411 0.80 1.90366 31.32 10 196.660 0.50 11* 10.004 1.67 1.74320 49.34 12* 10.770 Variable 13* 21.947 0.80 1.53071 55.69 14* 5.403 Variable 15* 71.970 2.76 1.53071 55.69 16* 6.898 1.50 17 1.30 1.51633 64.14 18 0.51 19 0.50 1.51633 64.14 20 0.53 Image plane Aspherical surface data 8th surface k = 0.000 A4 = 2.62745e05, A6 = 2.50727e06, A8 = 2.37200e07 11th surface k = 0.000 A4 = 5.05801e04, A6 = 1.02059e05 12th surface k = 0.000 A4 = 3.95717e04, A6 = 7.87815e06 13th surface k = 0.000 A4 = 5.42881e04, A6 = 2.74970e05 14th surface k = 0.000 A4 = 2.56966e04, A6 = 3.90543e05 15th surface k = 0.000 A4 = 9.42772e04, A6 = 2.13813e05 16th surface k = 0.000 A4 = 1.59189e04, A6 = 2.15085e05 Zoom data Zoom ratio 3.00 WE ST TE f 3.43 5.94 10.29 FNO. 2.99 3.60 4.79 2 129.11 70.79 40.72 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 57.37 49.31 49.26 d6 20.76 9.53 3.59 d12 2.40 3.11 3.77 d14 3.80 6.26 11.49 Unit focal length f1 = 8.41 f2 = 8.07 f3 = 8.09 f4 = 12.01
Example 16
(505) TABLE-US-00016 Unit mm Surface data Surface no. r d nd d Object plane 1 160.355 1.40 1.72916 54.68 2 10.000 5.72 3* 53.459 1.60 1.53071 55.69 4* 9.207 3.28 5* 44.236 2.65 1.63493 23.89 6* 41.893 Variable 7 0.50 (Stop) 8* 9.684 5.62 1.80610 40.92 9* 45.950 0.72 10 17.157 0.85 1.84666 23.78 11 5.901 2.06 1.49700 81.61 12 24.526 Variable 13* 12.586 0.85 1.53071 55.69 14* 6.865 Variable 15* 114.926 2.10 1.53071 55.69 16* 10.821 Variable 17 60.571 1.01 1.53071 55.69 18 141.171 0.8 19 1.30 1.51633 64.14 20 0.51 21 0.50 1.51633 64.14 22 0.53 Image plane Aspherical surface data 3rd surface k = 0.000 A4 = 3.72931e05, A6 = 1.89572e07 4th surface k = 1.566 5th surface k = 0.000 A4 = 1.46434e04, A6 = 1.20274e06 6th surface k = 0.000 A4 = 7.19595e05, A6 = 1.04935e06 8th surface k = 0.000 A4 = 3.72000e05, A6 = 5.60586e08 9th surface k = 0.000 A4 = 1.42419e04, A6 = 1.69752e06 13th surface k = 0.000 A4 = 1.31085e03, A6 = 2.14798e05 14th surface k = 0.000 A4 = 1.21073e03, A6 = 1.32961e05 15th surface k = 0.000 A4 = 8.70903e04, A6 = 1.54606e05 16th surface k = 0.000 A4 = 1.33279e03, A6 = 1.88046e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.43 6.42 12.01 FNO. 3.19 3.95 5.48 2 130.39 66.67 35.60 IH 4.01 4.01 4.01 BF (in air) 3.03 3.03 3.03 LTL (in air) 64.37 52.96 52.30 d6 25.67 9.55 1.50 d12 2.40 5.20 12.18 d14 3.80 4.96 6.43 d16 1.11 1.86 0.80 Unit focal length f1 = 9.64 f2 = 12.92 f3 = 30.00 f4 = 18.74 f5 = 80.00
Example 17
(506) TABLE-US-00017 Unit mm Surface data Surface no. r d nd d Object plane 1 48.096 1.20 1.81600 46.62 2 8.647 7.43 3 24.656 1.00 1.65160 58.55 4 23.886 1.50 5 21.753 2.50 1.89286 20.36 6 66.058 Variable 7 0.50 (Stop) 8* 10.714 3.49 1.74320 49.34 9* 33.290 1.77 10 43.748 0.80 2.00100 29.13 11 7.777 4.36 1.43875 94.66 12 16.171 0.50 13 112.239 1.40 1.49700 81.61 14 24.059 Variable 15* 48.489 0.80 1.53071 55.69 16* 12.930 Variable 17* 156.323 1.50 1.53071 55.69 18* 11.015 1.50 19 1.30 1.51633 64.14 20 0.51 21 0.50 1.51633 64.14 22 0.53 Image plane Aspherical surface data 8th surface k = 0.018 A4 = 8.48629e05, A6 = 1.71721e07, A8 = 1.97461e09 9th surface k = 0.000 A4 = 1.33316e04, A6 = 6.84529e07, A8 = 3.67882e09 15th surface k = 0.000 A4 = 4.74867e04, A6 = 1.57328e05 16th surface k = 0.000 A4 = 6.73925e04, A6 = 6.95273e06 17th surface k = 0.000 A4 = 1.23354e03, A6 = 3.93936e05 18th surface k = 0.000 A4 = 2.38248e03, A6 = 3.43955e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.53 6.60 12.35 FNO. 1.65 1.98 2.51 2 136.11 65.17 34.35 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 67.37 54.18 50.44 d6 28.97 11.94 1.80 d14 2.20 5.14 12.55 d16 3.71 4.61 3.60 Unit focal length f1 = 8.94 f2 = 12.48 f3 = 19.15 f4 = 19.45
Example 18
(507) TABLE-US-00018 Unit mm Surface data Surface no. r d nd d Object plane 1 62.752 1.20 1.81600 46.62 2 8.880 6.33 3 99.283 1.00 1.65160 58.55 4 13.186 1.50 5 14.337 2.50 1.89286 20.36 6 43.032 3.00 7 33.316 0.90 1.72916 54.68 8 896.864 Variable 9 0.50 (Stop) 10* 9.243 2.98 1.74320 49.34 11* 39.408 0.92 12 20.889 0.80 2.00100 29.13 13 6.495 3.93 1.43875 94.66 14 12.904 Variable 15* 21.247 0.80 1.53071 55.69 16* 8.282 Variable 17* 8.850 2.36 1.53071 55.69 18* 13.548 1.50 19 1.30 1.51633 64.14 20 0.51 21 0.50 1.51633 64.14 22 0.53 Image plane Aspherical surface data 10th surface k = 0.198 A4 = 1.49825e04, A6 = 7.81709e07, A8 = 8.64503e10 11th surface k = 0.000 A4 = 1.84136e04, A6 = 1.03936e06, A8 = 2.53756e08 15th surface k = 0.000 A4 = 6.88584e04, A6 = 3.18227e05 16th surface k = 0.000 A4 = 1.24019e03, A6 = 2.35653e05 17th surface k = 0.000 A4 = 4.80194e04, A6 = 9.17362e06 18th surface k = 0.000 A4 = 1.73787e03, A6 = 2.06705e05 Zoom data Zoom ratio 3.50 WE ST TE f 3.53 6.60 12.36 FNO. 1.94 2.43 3.24 2 139.46 65.17 34.35 IH 4.01 4.01 4.01 BF (in air) 3.73 3.73 3.73 LTL (in air) 61.37 53.00 52.70 d8 21.22 8.65 1.30 d14 4.03 7.60 15.35 d16 3.67 4.30 3.60 Unit focal length f1 = 7.35 f2 = 11.20 f3 = 11.12 f4 = 10.47
(508) Next, values of conditional expressions in each example are given below. - (hyphen) indicates that there is no corresponding arrangement.
(509) TABLE-US-00019 Example 1 Example 2 Example 3 (1) |f1|/|f2| 0.78778 0.68179 0.77959 (2) L2/L1 0.743215 0.645337 0.570563 (3) Lt/Lw 0.764579 0.87994 0.793474 (4) f1/fw 2.47356 2.35854 2.64653 (5) L1/ 5.06436 3.24955 3.03781 (y tan2w) (6) L1/f1 1.44955 1.79106 1.54281 (7) L2/ 3.76391 2.09706 1.73326 (y tan2w) (8) L2/f2 0.848692 0.788044 0.686246 (9) L12airt/L2 0.213892 0.21389 0.250289 (10) f3/f1 2.213972 2.371227 2.980017 (11) f4/L1 1.836837 0.89584 1.482281 (12) 3t/3w 1.009253 1.108376 1.045133 (13) 2w 0.33616 0.40787 0.35605 (14) 2t/2w 3.467769 3.157703 3.34874 (15) (2t/2w)/ 0.990804 0.902203 0.956791 (ft/tw) (16) (2t/2w)/ 3.435975 2.848947 3.204128 (3t/3w) (17) |fct| 0.82526 0.9204 0.62769 (18) |fct|/|fcw| 1.033739 1.366686 1.198571 (19) L12airt/Lt 0.043874 0.0379 0.04203 (20) (r1nf + r1nb)/ 1.170452 1.206084 1.206542 (r1nf r1nb) (21) (r1pf + r1pb)/ 1.90977 0.47291 0.50079 (r1pf r1pb) (22) (r3ff + r3fb)/ 0.473203 1.236149 1.062379 (r3ff r3fb) (23) L1/L1air 1.590683 1.602379 1.694519 (24) L2/L2air 9.650877 6.021764 8.127378 (25) f1/L12airw 0.34274 0.36976 0.36401 (26) f2/L12airw 0.435066 0.542339 0.466924 (27) f2f/f2b 0.01305 0.006029 0.18673 (28) DTw 67.4981 47.9071 46.7421 (29) nd3 1.53071 1.53071 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 0 0 0 (32) Lt/ 18.3498 11.8349 10.3216 (y tan2w) Example 4 Example 5 Example 6 (1) |f1|/|f2| 0.74004 0.80176 0.77775 (2) L2/L1 0.61643 0.49777 0.493195 (3) Lt/Lw 0.827188 0.786457 0.883666 (4) f1/fw 2.36708 2.48531 2.68218 (5) L1/ 3.51662 3.11505 1.9515 (y tan2w) (6) L1/f1 1.71939 1.67308 1.66528 (7) L2/ 2.16775 1.55058 0.96247 (y tan2w) (8) L2/f2 0.784355 0.667715 0.638772 (9) L12airt/L2 0.250703 0.281713 0.264691 (10) f3/f1 2.727231 2.52965 1.826703 (11) f4/L1 1.59002 1.807632 0.81787 (12) 3t/3w 0.999989 0.999762 1.304973 (13) 2w 0.38228 0.35082 0.35 (14) 2t/2w 3.499965 3.500748 3.065074 (15) (2t/2w)/ 1 1.000227 0.76626 (ft/tw) (16) (2t/2w)/ 3.500002 3.501582 2.348764 (3t/3w) (17) |fct| 0.61323 0.65876 1.57661 (18) |fct|/|fcw| 0.999982 0.999073 2.024435 (19) L12airt/Lt 0.045005 0.044057 0.036224 (20) (r1nf + r1nb)/ 1.868067 1.797231 1.55036 (r1nf r1nb) (21) (r1pf + r1pb)/ 2.27494 2.64415 0.55894 (r1pf r1pb) (22) (r3ff + r3fb)/ 3.041068 3.018919 1.242208 (r3ff r3fb) (23) L1/L1air 1.593609 1.573796 1.536605 (24) L2/L2air 13.5722 9.745984 4.568856 (25) f1/L12airw 0.35835 0.36045 0.37141 (26) f2/L12airw 0.484232 0.449569 0.47754 (27) f2f/f2b 0.00132 0.02435 0.1585 (28) DTw 51.9203 46.9834 28.4385 (29) nd3 1.53071 1.53071 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 0 0 0 (32) Lt/ 12.0754 9.91475 7.03287 (y tan2w) Example 7 Example 8 Example 9 (1) |f1|/|f2| 0.71064 0.73358 0.85175 (2) L2/L1 0.539752 0.525077 0.517443 (3) Lt/Lw 0.824842 0.878046 0.750362 (4) f1/fw 2.4209 2.58038 3.06464 (5) L1/ 3.4784 1.83106 1.70684 (y tan2w) (6) L1/f1 1.71983 1.64971 1.28678 (7) L2/ 1.87747 0.96145 0.88319 (y tan2w) (8) L2/f2 0.659677 0.635449 0.567122 (9) L12airt/L2 0.259464 0.260866 0.28575 (10) f3/f1 3.613222 3.351022 2.793988 (11) f4/L1 1.180781 1.142309 1.210158 (12) 3t/3w 0.995968 0.999985 0.993815 (13) 2w 0.38453 0.40908 0.35 (14) 2t/2w 3.514055 3.999949 3.018614 (15) (2t/2w)/ 1.004022 0.999989 1.006209 (ft/tw) (16) (2t/2w)/ 3.528282 4.000008 3.0374 (3t/3w) (17) |fct| 0.44486 0.39998 0.38929 (18) |fct|/|fcw| 0.9796 0.999982 0.973234 (19) L12airt/Lt 0.040431 0.037982 0.044437 (20) (r1nf + r1nb)/ 1.251578 2.476873 1.165284 (r1nf r1nb) (21) (r1pf + r1pb)/ 0.36857 2.70197 0.524251 (r1pf r1pb) (22) (r3ff + r3fb)/ 5.15871 3.863063 4.259472 (r3ff r3fb) (23) L1/L1air 1.617492 1.468946 1.747922 (24) L2/L2air 8.897306 5.082581 2.347682 (25) f1/L12airw 0.34978 0.36695 0.41094 (26) f2/L12airw 0.492203 0.50021 0.482462 (27) f2f/f2b 0.065906 0.21515 0.269055 (28) DTw 50.7658 27.9317 28.1332 (29) nd3 1.63493 1.53071 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 31.8 0 0 (32) Lt/ 12.0485 6.60345 5.67932 (y tan2w) Example 10 Example 11 Example 12 (1) |f1|/|f2| 0.79236 1.03635 0.78701 (2) L2/L1 0.430511 0.455 0.629456 (3) Lt/Lw 0.798419 0.737298 0.806737 (4) f1/fw 2.73001 2.47068 2.91116 (5) L1/ 1.89424 1.36859 4.99988 (y tan2w) (6) L1/f1 1.63261 1.49622 1.37447 (7) L2/ 0.81549 0.62271 3.1472 (y tan2w) (8) L2/f2 0.556914 0.705525 0.680897 (9) L12airt/L2 0.303881 0.765787 0.231509 (10) f3/f1 1.950044 1.126654 3.004556 (11) f4/L1 0.743277 1.207586 1.614352 (12) 3t/3w 0.979618 1.125018 1.230245 (13) 2w 0.38099 0.25968 0.32333 (14) 2t/2w 3.062419 2.666642 3.65766 (15) (2t/2w)/ 1.020804 0.888892 0.812812 (ft/tw) (16) (2t/2w)/ 3.126136 2.37031 2.973115 (3t/3w) (17) |fct| 0.61816 2.41113 1.05154 (18) |fct|/|fcw| 0.943103 1.365431 2.22842 (19) L12airt/Lt 0.041769 0.109224 0.037325 (20) (r1nf + r1nb)/ 1.721174 2.405643 1.321567 (r1nf r1nb) (21) (r1pf + r1pb)/ 0.98149 5.01767 0.86921 (r1pf r1pb) (22) (r3ff + r3fb)/ 0.258445 1.049226 2.179589 (r3ff r3fb) (23) L1/L1air 1.507801 1.600266 1.748237 (24) L2/L2air 3.605649 11.55429 6.045477 (25) f1/L12airw 0.40893 0.35165 0.32726 (26) f2/L12airw 0.516096 0.339322 0.415827 (27) f2f/f2b 0.26327 0.17587 (28) DTw 27.5432 27.3263 63.8186 (29) nd3 1.53071 1.53071 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 0 0 0 (32) Lt/ 5.93285 4.36591 19.5208 (y tan2w) Example 13 Example 14 Example 15 (1) |f1|/|f2| 0.7556 0.78421 1.04165 (2) L2/L1 0.663413 0.618056 0.546772 (3) Lt/Lw 0.801407 0.774556 0.860204 (4) f1/fw 2.38341 2.97429 2.45193 (5) L1/ 5.94491 2.40957 2.96492 (y tan2w) (6) L1/f1 1.62351 1.42578 1.739 (7) L2/ 3.94393 1.48925 1.62113 (y tan2w) (8) L2/f2 0.813822 0.691054 0.990444 (9) L12airt/L2 0.22714 0.246149 0.510928 (10) f3/f1 1.970676 2.171855 0.961581 (11) f4/L1 1.384838 0.978952 0.820958 (12) 3t/3w 1.129815 1.032179 1.396347 (13) 2w 0.32385 0.35 0.25137 (14) 2t/2w 3.982819 2.906423 2.148475 (15) (2t/2w)/ 0.885081 0.968819 0.716155 (ft/tw) (16) (2t/2w)/ 3.525195 2.815814 1.53864 (3t/3w) (17) |fct| 1.48647 0.6368 4.67543 (18) |fct|/|fcw| 1.453986 1.10469 2.149454 (19) L12airt/Lt 0.040029 0.043056 0.081923 (20) (r1nf + r1nb)/ 1.511573 1.109483 1.775919 (r1nf r1nb) (21) (r1pf + r1pb)/ 1.48879 0.296536 5.01759 (r1pf r1pb) (22) (r3ff + r3fb)/ 0.676064 3.366619 0.604921 (r3ff r3fb) (23) L1/L1air 1.644162 1.805128 1.551703 (24) L2/L2air 8.805154 1.878241 15.99348 (25) f1/L12airw 0.30255 0.38363 0.39567 (26) f2/L12airw 0.400418 0.489191 0.37985 (27) f2f/f2b 1.034222 6.673503 (28) DTw 69.6489 34.5389 44.3734 (29) nd3 1.53071 1.63493 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 0 31.8 0 (32) Lt/ 22.3791 8.51392 10.1105 (y tan2w) Example 16 Example 17 Example 18 (1) |f1|/|f2| 0.74616 0.71613 0.65627 (2) L2/L1 0.63167 0.904681 0.525272 (3) Lt/Lw 0.81424 0.75105 0.860121 (4) f1/fw 2.80998 2.53181 2.08283 (5) L1/ 3.10687 3.53339 4.79061 (y tan2w) (6) L1/f1 1.51957 1.52503 2.23447 (7) L2/ 1.96252 3.19659 2.51637 (y tan2w) (8) L2/f2 0.716213 0.988025 0.77026 (9) L12airt/L2 0.216181 0.186834 0.208587 (10) f3/f1 3.112736 2.142496 1.512982 (11) f4/L1 1.27977 1.426998 0.637298 (12) 3t/3w 1.049986 0.996278 0.997159 (13) 2w 0.37047 0.32857 0.40211 (14) 2t/2w 3.260333 3.513028 3.509851 (15) (2t/2w)/ 0.931527 1.003724 1.002811 (ft/tw) (16) (2t/2w)/ 3.10512 3.526152 3.51985 (3t/3w) (17) |fct| 0.55486 0.78627 1.114 (18) |fct|/|fcw| 1.271866 0.986553 0.99287 (19) L12airt/Lt 0.0378 0.045121 0.033764 (20) (r1nf + r1nb)/ 1.133019 1.438401 1.329681 (r1nf r1nb) (21) (r1pf + r1pb)/ 0.027205 1.98194 1.9993 (r1pf r1pb) (22) (r3ff + r3fb)/ 3.399814 0.64697 (r3ff r3fb) (23) L1/L1air 1.627751 1.526341 1.517149 (24) L2/L2air 12.86183 6.975098 9.358519 (25) f1/L12airw 0.36826 0.30323 0.33845 (26) f2/L12airw 0.493538 0.42342 0.515728 (27) f2f/f2b 0.163462 0.00219 (28) DTw 45.963 54.2318 58.0499 (29) nd3 1.53071 1.53071 1.53071 (30) nd4 1.53071 1.53071 1.53071 (31) |d3 d4| 0 0 0 (32) Lt/ 11.2238 13.2362 15.5455 (y tan2w)
(510) Values of parameters in each example are given below.
(511) TABLE-US-00020 Example 1 Example 2 Example 3 Example 4 2w 0.33616 0.40787 0.35605 0.38228 2t 1.16571 1.28795 1.1923 1.33796 3w 1.493964 1.629148 1.367158 1.41724 3t 1.507788 1.805708 1.428862 1.417225 fcw 0.79833 0.67345 0.5237 0.61324 fct 0.82526 0.9204 0.62769 0.61323 f2f 9.9706 11.0238 9.2302 9.9815 f2b 763.889 1828.52 49.432 7537.64 Lw 59.98 59.97 59.97 57.96 Lt 45.86 52.77 47.58 47.95 Example 5 Example 6 Example 7 Example 8 2w 0.35082 0.35 0.38453 0.40908 2t 1.22812 1.07277 1.35126 1.63628 3w 1.415967 1.785506 1.284103 1.343137 3t 1.41563 2.330038 1.278925 1.343117 fcw 0.65937 0.77879 0.45413 0.39999 fct 0.65876 1.57661 0.44486 0.39998 f2f 10.3217 10.0191 11.6323 9.7467 f2b 423.8906 63.2104 176.4988 45.3018 Lw 57.72 62.47 59.97 59.97 Lt 45.39 55.20 49.47 52.66 Example 9 Example 10 Example 11 Example 12 2w 0.35 0.38099 0.25968 0.32333 2t 1.05651 1.16675 0.69248 1.18265 3w 1.361073 1.854026 1.913522 1.310902 3t 1.352655 1.816237 2.152747 1.612731 fcw 0.39999 0.65545 1.76584 0.47188 fct 0.38929 0.61816 2.41113 1.05154 f2f 14.527 9.1538 9.2955 f2b 53.9926 34.7699 52.8543 Lw 59.99 59.97 59.98 66.42 Lt 45.01 47.88 44.22 53.59 Example 13 Example 14 Example 15 Example 16 2w 0.32385 0.35 0.25137 0.37047 2t 1.28984 1.01725 0.54006 1.20786 3w 1.599434 1.632344 2.399306 1.377215 3t 1.807065 1.684871 3.350264 1.446057 fcw 1.02234 0.57645 2.17517 0.43626 fct 1.48647 0.6368 4.67543 0.55486 f2f 19.9608 48.2254 14.2366 f2b 19.3003 7.2264 87.0943 Lw 62.34 59.97 57.99 64.98 Lt 49.96 46.45 49.88 52.91 Example 17 Example 18 2w 0.32857 0.40211 2t 1.15429 1.41135 3w 1.493268 2.165611 3t 1.48771 2.159459 fcw 0.79698 1.122 fct 0.78627 1.114 f2f 10.3442 f2b 4715.4 Lw 67.97 61.98 Lt 51.04 53.31
(512)
(513) Moreover, as the photographic optical system 2 of the single-lens mirrorless camera 1, the zoom lens described in any one of the examples from the first example to the eighteenth example is to be used.
(514)
(515) The digital camera 40 according to the present embodiment includes the photographic optical system 41 which is positioned in a photographic optical path 42, a shutter button 45, and a liquid-crystal display monitor 47. As the shutter button 45 disposed on an upper portion of the digital camera 40 is pressed, in conjunction with the pressing of the shutter button 45, photography is carried out by the photographic optical system 41 such as the zoom lens according to the first example. An object image which is formed by the photographic optical system 41 is formed on an image pickup element (photoelectric conversion surface) which is provided near an image forming surface. The object image which has been received optically by the image pickup element is displayed on the liquid-crystal display monitor 47 which is provided to a rear surface of the camera, as an electronic image by a processing means. Moreover, it is possible to record the electronic image which has been photographed, in a storage means.
(516)
(517) As shown in
(518) The temporary storage memory 17, the image processing section 18, the storage medium section 19, the display section 20, and the set-information storage memory section 21 are structured to be capable of mutually inputting and outputting data via a bus 22. Moreover, the CCD 49 and the CDS/ADC section 24 are connected to the imaging drive circuit 16.
(519) The operating section 12 includes various input buttons and switches, and informs the control section 13 of event information which is input from outside (by a user of the digital camera) via these input buttons and switches. The control section 13 is a central processing unit (CPU), and has a built-in computer program memory which is not shown in the diagram. The control section 13 controls the entire digital camera 40 according to a computer program stored in this computer program memory.
(520) The CCD 49 is driven and controlled by the imaging drive circuit 16, and which converts an amount of light for each pixel of the object image formed by the photographic optical system 41 to an electric signal, and outputs to the CDS/ADC section 24.
(521) The CDS/ADC section 24 is a circuit which amplifies the electric signal which is input from the CCD 49, and carries out analog/digital conversion, and outputs to the temporary storage memory 17 image raw data (Bayer data, hereinafter called as RAW data) which is only amplified and converted to digital data.
(522) The temporary storage memory 17 is a buffer which includes an SDRAM (Synchronous Dynamic Random Access Memory) for example, and is a memory device which stores temporarily the RAW data which is output from the CDS/ADC section 24. The image processing section 18 is a circuit which reads the RAW data stored in the temporary storage memory 17, or the RAW data stored in the storage medium section 19, and carries out electrically various image-processing including the distortion correction, based on image-quality parameters specified by the control section 13.
(523) The storage medium section 19 is a recording medium in the form of a card or a stick including a flash memory for instance, detachably mounted. The storage medium section 19 records and maintains the RAW data transferred from the temporary storage memory 17 and image data subjected to image processing in the image processing section 18 in the card flash memory and the stick flash memory.
(524) The display section 20 includes the liquid-crystal display monitor, and displays photographed RAW data, image data and operation menu on the liquid-crystal display monitor. The set-information storage memory section 21 includes a ROM section in which various image quality parameters are stored in advance, and a RAM section which stores image quality parameters which are selected by an input operation on the operating section 12, from among the image quality parameters which are read from the ROM section.
(525) In the digital camera 40 in which such an arrangement is made, by adopting the zoom lens according to the example as the photographic optical system 41, it is possible to let the digital camera 40 configured in such manner to be an image pickup apparatus which is suitable for capturing an image in a wide angle with a high resolution while being small-sized.
(526) The present invention can have various modified examples without departing from the scope of the invention. Moreover, shapes of lenses and the number of lenses are not necessarily restricted to the shapes and the number of lenses indicated in the examples. In the examples described heretofore, the cover glass C may not be disposed necessarily. A lens that is not shown in the diagrams of the examples described above, and that does not have a refractive power practically may be disposed in a lens unit or outside the lens unit.
(527) According to the present embodiment, it is possible to provide a zoom lens having a small size in which an aberration is corrected favorably without a light ray being vignetted throughout the entire zoom range while securing a wide angle of view and a high zooming ratio, and an image pickup apparatus using the zoom lens.
(528) As described heretofore, the present invention is suitable for a zoom lens having a small size in which an aberration is corrected favorably without a light ray being vignetted throughout the entire zoom range while securing a wide angle of view and a high zooming ratio, and for an image pickup apparatus using the zoom lens.