ZOOM LENS AND IMAGING APPARATUS
20230043840 · 2023-02-09
Assignee
Inventors
- Hiroki Saito (Saitama, JP)
- Tatsuyuki Ogino (Saitama, JP)
- Masato Kondo (Saitama, JP)
- Takuya Tanaka (Saitama, JP)
Cpc classification
G02B15/16
PHYSICS
International classification
G02B15/14
PHYSICS
G02B13/00
PHYSICS
Abstract
A zoom lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a subsequent group that has a plurality of lens groups, wherein: the zoom lens includes an aperture stop at a position closer to the image side than a lens surface closest to the image side in the second lens group, a lens group closest to the image side in the subsequent group includes at least one negative lens of which an object side lens surface is a concave surface being in contact with air, during zooming, a spacing between the first lens group and the second lens group changes, a spacing between the second lens group and the subsequent group changes, and spacings between all adjacent lens groups in the subsequent group change.
Claims
1. A zoom lens consisting of, in order from an object side to an image side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a subsequent group that has a plurality of lens groups, wherein: the zoom lens includes an aperture stop at a position closer to the image side than a lens surface closest to the image side in the second lens group, a lens group closest to the image side in the subsequent group includes at least one negative lens of which an object side lens surface is a concave surface being in contact with air, during zooming, a spacing between the first lens group and the second lens group changes, a spacing between the second lens group and the subsequent group changes, and spacings between all adjacent lens groups in the subsequent group change, during zooming, lens spacings inside the first lens group, the second lens group, and the plurality of lens groups in the subsequent group are unchanged, and assuming that a focal length of the zoom lens at a wide angle end in a state in which an infinite distance object is in focus is fw, a distance on an optical axis from a lens surface closest to the object side in the first lens group to a paraxial entrance pupil position at the wide angle end in a state in which the infinite distance object is in focus is Denw, and a sign of Denw is positive in a case where the paraxial entrance pupil position is closer to the image side than the lens surface closest to the object side in the first lens group, and is negative in a case where the paraxial entrance pupil position is closer to the object side than the lens surface closest to the object side in the first lens group, Conditional Expression (1) is satisfied, which is represented by
0.7<fw/Denw<1.5 (1).
2. The zoom lens according to claim 1, wherein assuming that a distance on the optical axis from a paraxial exit pupil position to an image plane at the wide angle end in a state in which the infinite distance object is in focus is Dexw, and a sign of Dexw is positive in a case where the paraxial exit pupil position is closer to the object side than the image plane, and is negative in a case where the paraxial exit pupil position is closer to the image side than the image plane, Conditional Expression (2) is satisfied, which is represented by
0.25<fw/Dexw<1 (2).
3. The zoom lens according to claim 1, wherein assuming that a distance on the optical axis from the lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the first lens group is D1, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis from the lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the subsequent group, at a telephoto end in a state in which the infinite distance object is in focus is TLt, Conditional Expression (3) is satisfied, which is represented by
0.01<D1/TLt<0.1 (3).
4. The zoom lens according to claim 1, wherein assuming that a focal length of the zoom lens at a telephoto end in a state in which the infinite distance object is in focus is ft, Conditional Expression (4) is satisfied, which is represented by
4.9<ft/fw<12 (4).
5. The zoom lens according to claim 1, wherein: the subsequent group includes at least one Lx lens of which an image side lens surface is a convex surface being in contact with air, and assuming that a lateral magnification in an A optical system, which minimizes an absolute value of an inverse of a lateral magnification at the wide angle end in a case where the aperture stop is used as an object point in a state in which the infinite distance object is in focus, in at least one optical system configured to range from a lens surface adjacent to the image side of the aperture stop to an image side lens surface of the Lx lens is PA, Conditional Expression (5) is satisfied, which is represented by
−0.5<1/βA<0.5 (5).
6. The zoom lens according to claim 5, wherein assuming that a height of an on-axis marginal ray on a lens surface closest to the image side in the A optical system from the optical axis at a telephoto end in a state in which the infinite distance object is in focus is HAt, and a height of the on-axis marginal ray in the aperture stop from the optical axis at the telephoto end in a state in which the infinite distance object is in focus is HSt, Conditional Expression (6) is satisfied, which is represented by
0.73<HAt/HSt<2.3 (6).
7. The zoom lens according to claim 5, wherein assuming that a focal length of the zoom lens at a telephoto end in a state in which the infinite distance object is in focus is ft, and a combined focal length from a lens surface closest to the object side in the subsequent group to a lens surface closest to the image side in the A optical system at the telephoto end in a state in which the infinite distance object is in focus is fpAt, Conditional Expression (7) is satisfied, which is represented by
3<ft/fpAt<15 (7).
8. The zoom lens according to claim 5, wherein assuming that a height of an on-axis marginal ray on a lens surface closest to the image side in the A optical system from the optical axis at a telephoto end in a state in which the infinite distance object is in focus is HAt, and a height of a principal ray with a maximum image height on the lens surface closest to the image side in the A optical system from the optical axis at the wide angle end in a state in which the infinite distance object is in focus is HAw, Conditional Expression (8) is satisfied, which is represented by
0.35<HAt/HAw<1.6 (8).
9. The zoom lens according to claim 5, wherein the subsequent group includes a lens surface, which is a concave surface being in contact with air and which is an image side surface, between a lens surface closest to the image side in the A optical system and a lens surface which is a concave surface being in contact with air and which is an object side surface included in the lens group closest to the image side in the subsequent group.
10. The zoom lens according to claim 5, wherein assuming that a distance on the optical axis from the aperture stop to a lens surface closest to the image side in the A optical system at a telephoto end in a state in which the infinite distance object is in focus is DSAt, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis from the aperture stop to a lens surface closest to the image side in the subsequent group, at the telephoto end in a state in which the infinite distance object is in focus is DSLt, Conditional Expression (9) is satisfied, which is represented by
0.1<DSAt/DSLt<0.54 (9).
11. The zoom lens according to claim 5, wherein assuming that a spacing on the optical axis between a lens surface closest to the image side in the A optical system and a lens surface adjacent to the image side of the lens surface closest to the image side in the A optical system at a telephoto end in a state in which the infinite distance object is in focus is dA, and a maximum image height at the telephoto end is Yt, Conditional Expression (10) is satisfied, which is represented by
0.015<dA/Yt<0.35 (10).
12. The zoom lens according to claim 1, wherein assuming that a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis from the lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the subsequent group at a telephoto end in a state in which the infinite distance object is in focus is TLt, and a focal length of the zoom lens at the telephoto end in a state in which the infinite distance object is in focus is ft, Conditional Expression (11) is satisfied, which is represented by
0.65<TLt/ft<1.5 (11).
13. The zoom lens according to claim 1, wherein the first lens group includes a negative lens and a positive lens, in order from a position closest to the object side to the image side.
14. The zoom lens according to claim 1, wherein assuming that a back focal length in terms of an air conversion distance at the wide angle end in a state in which the infinite distance object is in focus is BFw, and a maximum image height at the wide angle end is Yw, Conditional Expression (12) is satisfied, which is represented by
0.38<BFw/Yw<1.5 (12).
15. The zoom lens according to claim 1, wherein assuming that an Abbe number of a lens closest to the object side in the first lens group based on a d line is ν1, Conditional Expression (13) is satisfied, which is represented by
10<ν1<50 (13).
16. The zoom lens according to claim 1, wherein assuming that a refractive index of a lens closest to the object side in the first lens group at a d line is N1, Conditional Expression (14) is satisfied, which is represented by
1.7<N1<2.3 (14).
17. The zoom lens according to claim 1, wherein assuming that a refractive index of a negative lens closest to the object side at a d line among negative lenses included in the second lens group is N2n, Conditional Expression (15) is satisfied, which is represented by
1.6<N2n<2.2 (15).
18. The zoom lens according to claim 1, wherein assuming that a refractive index of a positive lens that has a strongest refractive power at a d line among positive lenses included in the second lens group is N2p, Conditional Expression (16) is satisfied, which is represented by
1.65<N2p<2 (16).
19. The zoom lens according to claim 1, wherein assuming that an Abbe number of a negative lens closest to the image side based on a d line among negative lenses included in the subsequent group is νnL, Conditional Expression (17) is satisfied, which is represented by
27<νnL<102 (17).
20. The zoom lens according to claim 1, wherein the subsequent group includes at least one lens group that has a positive refractive power.
21. The zoom lens according to claim 20, wherein assuming that a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis from the lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the subsequent group at a telephoto end in a state in which the infinite distance object is in focus is TLt, a difference in an optical axis direction between a position at the wide angle end and a position at the telephoto end of a lens group closest to the object side among lens groups that have positive refractive powers and that are included in the subsequent group in a state in which the infinite distance object is in focus is Mp, and a sign of Mp is positive in a case where the lens group closest to the object side moves from the object side to the image side, and is negative in a case where the lens group closest to the object side moves from the image side to the object side, during zooming from the wide angle end to the telephoto end, Conditional Expression (18) is satisfied, which is represented by
−0.45<Mp/TLt<−0.06 (18).
22. The zoom lens according to claim 20, wherein assuming that a focal length of a lens group closest to the object side among lens groups that have positive refractive powers and that are included in the subsequent group in a state in which the infinite distance object is in focus is fp, and a focal length of the second lens group is f2, Conditional Expression (19) is satisfied, which is represented by
−4.3<fp/f2<−1.1 (19).
23. The zoom lens according to claim 20, wherein assuming that a distance on the optical axis from a lens surface closest to the image side in the first lens group to a lens surface closest to the object side in a lens group closest to the object side among lens groups that have positive refractive powers and that are included in the subsequent group at a telephoto end in a state in which the infinite distance object is in focus is D1pt, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis from the lens surface closest to the object side in the first lens group to a lens surface closest to the image side in the subsequent group, at the telephoto end in a state in which the infinite distance object is in focus is TLt, Conditional Expression (20) is satisfied, which is represented by
0.2<D1pt/TLt<0.5 (20).
24. The zoom lens according to claim 1, wherein: the subsequent group includes at least one Lx lens of which an image side lens surface is a convex surface being in contact with air, an optical system, which minimizes an absolute value of an inverse of a lateral magnification at the wide angle end in a case where the aperture stop is used as an object point in a state in which the infinite distance object is in focus, in at least one optical system configured to range from a lens surface adjacent to the image side of the aperture stop to an image side lens surface of the Lx lens is an A optical system, and assuming that a combined focal length at the wide angle end in a state in which the infinite distance object is in focus from a lens surface adjacent to the image side of a lens surface closest to the image side in the A optical system to a lens surface closest to the image side in the subsequent group is fBw, Conditional Expression (21) is satisfied, which is represented by
−1.6<fw/fBw<−0.25 (21).
25. The zoom lens according to claim 1, wherein assuming that a maximum half angle of view at the wide angle end in a state in which the infinite distance object is in focus is tow, and a maximum image height at the wide angle end is Yw, Conditional Expression (22) is satisfied, which is represented by
0.97<fw×tan ωw/Yw<1.3 (22).
26. The zoom lens according to claim 1, wherein the subsequent group includes a focus group that moves along the optical axis during focusing.
27. The zoom lens according to claim 26, wherein the focus group consists of two or fewer lenses.
28. The zoom lens according to claim 26, wherein the focus group has a negative refractive power.
29. The zoom lens according to claim 1, wherein assuming that a focal length of the first lens group is f1, and a focal length of the second lens group is f2, Conditional Expression (23) is satisfied, which is represented by
−0.3<f2/f1<−0.05 (23).
30. An imaging apparatus comprising the zoom lens according to claim 1.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
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DETAILED DESCRIPTION
[0064] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.
[0065] The zoom lens according to the present embodiment consists of, in order from the object side to the image side: a first lens group G1 that has a positive refractive power, a second lens group G2 that has a negative refractive power, and a subsequent group Gr that has a plurality of lens groups. As an example in
[0066] In the example shown in
[0067] The zoom lens according to the present embodiment is configured to include an aperture stop St closer to the image side than the lens surface closest to the image side in the second lens group G2. The aperture stop St in
[0068] In the zoom lens according to the present embodiment, during zooming, a spacing between the first lens group G1 and the second lens group G2 changes, a spacing between the second lens group G2 and the subsequent group Gr changes, and spacings between all adjacent lens groups in the subsequent group Gr change. Further, during zooming, the lens spacing inside the plurality of lens groups included in the first lens group G1, the second lens group G2, and the subsequent group Gr is unchanged. That is, in the zoom lens according to the present embodiment, the spacings between all the adjacent lens groups change with each other, and the lens spacings inside the lens groups do not change. In
[0069] As described above, the zoom lens consists of, in order from the object side to the image side, a first lens group G1 that has a positive refractive power, a second lens group G2 that has a negative refractive power, and a subsequent group Gr that has a plurality of lens groups, and includes an aperture stop St closer to the image side than the lens surface closest to the image side in the second lens group G2. During zooming, spacings between all the adjacent lens groups mutually change, and lens spacings inside the lens groups are unchanged. As a result, there is an advantage in achieving a high zoom ratio.
[0070] The lens group closest to the image side in the subsequent group Gr includes at least one negative lens of which the object side lens surface is a concave surface being in contact with air. The lens group closest to the image side in the subsequent group Gr includes at least one negative lens of which the object side lens surface is a concave surface being in contact with air. As a result, there is an advantage in achieving reduction in total length of the lens system. In
[0071] It is preferable that the first lens group G1 includes a negative lens and a positive lens, in order from the position closest to the object side to the image side. With such a configuration, there is an advantage in suppressing lateral chromatic aberration on the wide angle side. As a result, there is an advantage in suppressing longitudinal chromatic aberration on the telephoto side. In
[0072] It is preferable that the subsequent group Gr includes at least one lens group that has a positive refractive power. Since the subsequent group Gr includes at least one lens group in which the subsequent group Gr has a positive refractive power, there is an advantage in achieving a high zoom ratio. In
[0073] It is preferable that the subsequent group Gr includes a focus group that moves along the optical axis Z during focusing. Here, the focus group consists of at least one lens that moves during focusing. Focusing is performed by moving the focus group. Since the zoom lens includes the focus group in the subsequent group Gr, there is an advantage in suppressing fluctuations in various aberrations that occur during focusing. The right-pointing arrow drawn below the lenses L51 and L52 in
[0074] It is preferable that the focus group consists of two or fewer lenses. Since the focus group consists of two or fewer lenses of the focus group is advantageous for achieving reduction in weight of the focus group. Further, it is preferable that the focus group has a negative refractive power. Since the focus group has a negative refractive power, there is an advantage in achieving reduction in amount of movement of the focus group during focusing.
[0075] In the zoom lens according to the present embodiment, assuming that a focal length of a whole system at a wide angle end in a state in which an infinite distance object is in focus is fw and a distance on the optical axis Z from a lens surface closest to the object side in the first lens group to a paraxial entrance pupil position Penw at the wide angle end in a state in which the infinite distance object is in focus is Denw, it is preferable to satisfy Conditional Expression (1). Here, the sign of Denw is positive in a case where the paraxial entrance pupil position Penw is closer to the image side than the lens surface closest to the object side in the first lens group, and is negative in a case where the paraxial entrance pupil position Penw is closer to the object side than the lens surface closest to the object side in the first lens group.
[0076] By not allowing the corresponding value of Conditional Expression (1) to be equal to or less than the lower limit, the distance Denw is prevented from becoming excessively large, and the paraxial entrance pupil position Penw can be made closer to the object side. As a result, the height from the optical axis Z in a case where the off-axis ray passes through the first lens group G1 can be lowered, and the diameter increase of the first lens group G1 can be suppressed. Therefore, the size of the first lens group G1 can be reduced. As a result, there is an advantage in achieving reduction in weight. By not allowing the corresponding value of Conditional Expression (1) to be equal to or greater than the upper limit, the rays with the respective image heights are appropriately separated in the first lens group G1. As a result, there is an advantage in correcting lateral chromatic aberration. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (1-1), and it is yet more preferable to satisfy Conditional Expression (1-2).
0.7<fw/Denw<1.5 (1)
0.83<fw/Denw<1.35 (1-1)
0.94<fw/Denw<1.22 (1-2)
[0077] In the zoom lens according to the present embodiment, assuming that a focal length of a whole system at a wide angle end in a state in which an infinite distance object is in focus is fw and a distance on the optical axis Z from the paraxial exit pupil position Pexw to the image plane Sim at the wide angle end in a state in which the infinite distance object is in focus is Dexw, it is preferable to satisfy Conditional Expression (2). Here, the sign of Dexw is positive in a case where the paraxial exit pupil position Pexw is closer to the object side than the image plane Sim, and is negative in a case where the paraxial exit pupil position Pexw is closer to the image side than the image plane Sim.
0.25<fw/Dexw<1 (2)
0.33<fw/Dexw<0.6 (2-1)
0.39<fw/Dexw<0.55 (2-2)
[0078] In the zoom lens according to the present embodiment, assuming that a distance on the optical axis Z from the lens surface closest to the object side in the first lens group G1 to a lens surface closest to the image side in the first lens group G1 is D1, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis Z from the lens surface closest to the object side in the first lens group G1 to the lens surface closest to the image side in the subsequent group Gr, at the telephoto end in a state in which the infinite distance object is in focus is TLt, it is preferable to satisfy Conditional Expression (3). The lower part of
0.01<D1/TLt<0.1 (3)
0.015<D1/TLt<0.07 (3-1)
0.02<D1/TLt<0.053 (3-2)
[0079] In the zoom lens according to the present embodiment, assuming that a focal length of a whole system at a wide angle end in a state in which an infinite distance object is in focus is fw and a focal length of the whole system at the telephoto end in a state in which the infinite distance object is in focus is ft, it is preferable to satisfy Conditional Expression (4). By not allowing the corresponding value of Conditional Expression (4) to be equal to or less than the lower limit, there is an advantage in achieving an increase in zoom ratio. By not allowing the corresponding value of Conditional Expression (4) to be equal to or greater than the upper limit, the zoom ratio is prevented from becoming excessively high. As a result, there is an advantage in achieving reduction in size of the entire lens system. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (4-1), and it is yet more preferable to satisfy Conditional Expression (4-2).
4.9<ft/fw<12 (4)
5.7<ft/fw<10 (4-1)
6.2<ft/fw<7.5 (4-2)
[0080] It is preferable that the subsequent group Gr includes at least one Lx lens of which an image side lens surface is a convex surface being in contact with air. Assuming that a lateral magnification in an A optical system, which minimizes an absolute value of an inverse of a lateral magnification at the wide angle end in a case where the aperture stop St is used as an object point in a state in which the infinite distance object is in focus, in at least one optical system configured to range from a lens surface adjacent to the image side of the aperture stop St to the image side lens surface of the Lx lens is PA, it is preferable to satisfy Conditional Expression (5). That is, assuming that the lateral magnification of each optical system configured to range from the lens surface adjacent to the image side of the aperture stop St to the image side lens surface of each Lx lens is βx, an optical system, which minimizes |1/βx|, is the “A optical system”, and it is preferable that the lateral magnification βA of the A optical system satisfies Conditional Expression (5). Further, the image side lens surface (that is, the convex surface being in contact with air) of the Lx lens in the A optical system is hereinafter referred to as “A surface A”.
[0081] For example, in the zoom lens shown in
[0082] By not allowing the corresponding value of Conditional Expression (5) to be equal to or less than the lower limit, it is possible to suppress a decrease in the angle between the principal ray of the off-axis luminous flux passing through the A surface A and the optical axis Z. As a result, it is possible to suppress excessive correction in astigmatism occurring between the A surface A and the image plane Sim. By not allowing the corresponding value of Conditional Expression (5) to be equal to or greater than the upper limit, it is possible to suppress an increase in angle formed by the principal ray of the off-axis luminous flux passing through the A surface A and the optical axis Z. As a result, there is an advantage in correcting astigmatism occurring between the A surface A and the image plane Sim. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (5-1), and it is yet more preferable to satisfy Conditional Expression (5-2).
−0.5<1/βA<0.5 (5)
−0.4<1/βA<0.36 (5-1)
−0.35<1/βA<0.13 (5-2)
[0083] In the zoom lens according to the present embodiment, assuming that a height of an on-axis marginal ray on a lens surface (that is, the A surface A) closest to the image side in the A optical system from the optical axis Z at the telephoto end in a state in which the infinite distance object is in focus is HAt, and a height of the on-axis marginal ray in the aperture stop St from the optical axis Z at the telephoto end in a state in which the infinite distance object is in focus is HSt, it is preferable to satisfy Conditional Expression (6).
0.73<HAt/HSt<2.3 (6)
0.83<HAt/HSt<1.6 (6-1)
0.92<HAt/HSt<1.37 (6-2)
[0084] In the zoom lens according to the present embodiment, assuming that a focal length of the whole system at the telephoto end in a state in which the infinite distance object is in focus is ft, and a combined focal length from a lens surface closest to the object side in the subsequent group Gr to the lens surface (that is, the A surface A) closest to the image side in the A optical system at the telephoto end in a state in which the infinite distance object is in focus is fpAt, it is preferable to satisfy Conditional Expression (7). By not allowing the corresponding value of Conditional Expression (7) to be equal to or less than the lower limit, there is an advantage in ensuring the amount of peripheral light. By not allowing the corresponding value of Conditional Expression (7) to be equal to or greater than the upper limit, there is an advantage in suppressing spherical aberration on the telephoto side. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (7-1), and it is yet more preferable to satisfy Conditional Expression
3<ft/fpAt<15 (7)
4.5<ft/fpAt<12 (7-1)
5.7<ft/fpAt<9 (7-2)
[0085] In the zoom lens according to the present embodiment, assuming that a height of an on-axis marginal ray on the lens surface (that is, the A surface A) closest to the image side in the A optical system from the optical axis Z at the telephoto end in a state in which the infinite distance object is in focus is HAt, and a height of a principal ray with a maximum image height on the lens surface (that is, the A surface A) closest to the image side in the A optical system from the optical axis Z at the wide angle end in a state in which the infinite distance object is in focus is HAw, it is preferable to satisfy Conditional Expression (8).
0.35<HAt/HAw<1.6 (8)
0.65<HAt/HAw<1.4 (8-1)
0.83<HAt/HAw<1.25 (8-2)
[0086] It is preferable that the subsequent group Gr includes a lens surface, which is a concave surface being in contact with air and which is image side surface, between the lens surface (that is, the A surface A) closest to the image side in the A optical system and a lens surface which is a concave surface being in contact with air and which is an object side surface included in the lens group closest to the image side in the subsequent group Gr. By adopting such a configuration, there is an advantage in suppressing astigmatism on the wide angle side while maintaining the reduction in size of the entire lens system. In the example of
[0087] In the zoom lens according to the present embodiment, assuming that a distance on the optical axis Z from the aperture stop St to the lens surface (that is, the A surface A) closest to the image side in the A optical system at the telephoto end in a state in which the infinite distance object is in focus is DSAt, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis Z from the aperture stop St to the lens surface closest to the image side in the subsequent group Gr, at the telephoto end in a state in which the infinite distance object is in focus is DSLt, it is preferable to satisfy Conditional Expression (9). The lower part of
0.1<DSAt/DSLt<0.54 (9)
0.15<DSAt/DSLt<0.4 (9-1)
0.18<DSAt/DSLt<0.32 (9-2)
[0088] In the zoom lens according to the present embodiment, assuming that a spacing on the optical axis Z between the lens surface (that is, the A surface A) closest to the image side in the A optical system and a lens surface adjacent to the image side of the lens surface (that is, the A surface A) at the telephoto end in a state in which the infinite distance object is in focus is dA, and a maximum image height at the telephoto end is Yt, it is preferable to satisfy Conditional Expression (10). The lower part of
0.015<dA/Yt<0.35 (10)
0.025<dA/Yt<0.2 (10-1)
0.037<dA/Yt<0.11 (10-2)
[0089] In the zoom lens according to the present embodiment, assuming that a sum of a back focal length at an air conversion distance and a distance on the optical axis Z from a lens surface closest to the object side in the first lens group G1 to a lens surface closest to the image side in the subsequent group Gr at the telephoto end in a state in which the infinite distance object is in focus is TLt, and a focal length of the whole system at the telephoto end in a state in which the infinite distance object is in focus is ft, it is preferable to satisfy Conditional Expression (11). By not allowing the corresponding value of Conditional Expression (11) to be equal to or less than the lower limit, there is an advantage in suppressing longitudinal chromatic aberration on the telephoto side. By not allowing the corresponding value of Conditional Expression (11) to be equal to or greater than the upper limit, there is an advantage in achieving reduction in total length of the lens system and to be advantageous in reduction in size. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (11-1), and it is yet more preferable to satisfy Conditional Expression (11-2).
0.65<TLt/ft<1.5 (11)
0.8<TLt/ft<1.4 (11-1)
0.95<TLt/ft<1.27 (11-2)
[0090] In the zoom lens according to the present embodiment, assuming that a back focal length in terms of an air conversion distance at the wide angle end in a state in which the infinite distance object is in focus is BFw, and a maximum image height at the wide angle end is Yw, it is preferable to satisfy Conditional Expression (12). By not allowing the corresponding value of Conditional Expression (12) to be equal to or less than the lower limit, there is an advantage in ensuring the amount of peripheral light. By not allowing the corresponding value of Conditional Expression (12) to be equal to or greater than the upper limit, there is an advantage in achieving reduction in total length of the lens system and to be advantageous in reduction in size. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (12-1), and it is yet more preferable to satisfy Conditional Expression (12-2).
0.38<BFw/Yw<1.5 (12)
0.45<BFw/Yw<1.2 (12-1)
0.59<BFw/Yw<0.98 (12-2)
[0091] Assuming that an Abbe number of the lens closest to the object side in the first lens group G1 based on the d line is ν1, it is preferable to satisfy Conditional Expression (13). By not allowing the corresponding value of Conditional Expression (13) to be equal to or less than the lower limit, it is possible to suppress excessive correction of longitudinal chromatic aberration. By not allowing the corresponding value of Conditional Expression (13) to be equal to or greater than the upper limit, there is an advantage in correcting longitudinal chromatic aberration. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (13-1), and it is yet more preferable to satisfy Conditional Expression (13-2). In the example of
10<ν1<50 (13)
12<ν1<40 (13-1)
14<ν1<27.3 (13-2)
[0092] Assuming that a refractive index of the lens closest to the object side in the first lens group G1 at the d line is N1, it is preferable to satisfy Conditional Expression (14). By not allowing the corresponding value of Conditional Expression (14) to be equal to or less than the lower limit, there is an advantage in suppressing astigmatism. By not allowing the corresponding value of Conditional Expression (14) to be equal to or greater than the upper limit, the availability of the lens material is increased, and a material that is easier to manufacture can be used. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (14-1), and it is yet more preferable to satisfy Conditional Expression (14-2). In the example of
1.7<N1<2.3 (14)
1.84<N1<2.22 (14-1)
1.88<N1<2.16 (14-2)
[0093] Assuming that a refractive index of a negative lens closest to the object side at the d line among negative lenses included in the second lens group G2 is N2n, it is preferable to satisfy Conditional Expression (15). By not allowing the corresponding value of Conditional Expression (15) to be equal to or less than the lower limit, the refractive power can be ensured without making the absolute value of the curvature radius of the negative lens excessively small. Therefore, the size of the negative lens in the optical axis direction can be prevented from increasing. As a result, there is an advantage in achieving reduction in weight. By not allowing the corresponding value of Conditional Expression (15) to be equal to or greater than the upper limit, the availability of the lens material is increased, and a material that is easier to manufacture can be used. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (15-1), and it is yet more preferable to satisfy Conditional Expression (15-2). In the example of
1.6<N2n<2.2 (15)
1.65<N2n<2.11 (15-1)
1.7<N2n<2.05 (15-2)
[0094] Assuming that a refractive index of the positive lens that has the strongest refractive power at the d line among the positive lenses included in the second lens group G2 is N2p, it is preferable to satisfy Conditional Expression (16). By not allowing the corresponding value of Conditional Expression (16) to be equal to or less than the lower limit, there is an advantage in suppressing astigmatism. By not allowing the corresponding value of Conditional Expression (16) to be equal to or greater than the upper limit, the availability of the lens material is increased, and a material that is easier to manufacture can be used. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (16-1), and it is yet more preferable to satisfy Conditional Expression (16-2). In the example of
1.65<N2p<2 (16)
1.71<N2p<1.93 (16-1)
1.77<N2p<1.9 (16-2)
[0095] Assuming that an Abbe number of a negative lens closest to the image side based on the d line among negative lenses included in the subsequent group Gr is νnL, it is preferable to satisfy Conditional Expression (17). By not allowing the corresponding value of Conditional Expression (17) to be equal to or less than the lower limit, there is an advantage in suppressing lateral chromatic aberration. By not allowing the corresponding value of Conditional Expression (17) to be equal to or greater than the upper limit, it is possible to suppress excessive correction of lateral chromatic aberration. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (17-1), and it is yet more preferable to satisfy Conditional Expression (17-2). In the example of
27<νnL<102 (17)
50<νnL<96 (17-1)
70<νnL<88 (17-2)
[0096] In the zoom lens according to the present embodiment, assuming that a sum of a back focal length at an air conversion distance and a distance on the optical axis Z from a lens surface closest to the object side in the first lens group G1 to a lens surface closest to the image side in the subsequent group Gr at the telephoto end in a state in which the infinite distance object is in focus is TLt, a difference in the direction of the optical axis Z between positions of a lens group closest to the object side at the wide angle end and at the telephoto end among lens groups that have positive refractive powers and that are included in the subsequent group Gr in a state in which the infinite distance object is in focus is Mp, it is preferable to satisfy Conditional Expression (18). Here, the sign of Mp is positive in a case where the lens group closest to the object side moves from the object side to the image side, and is negative in a case where the lens group moves from the image side to the object side, during zooming from the wide angle end to the telephoto end. By not allowing the corresponding value of Conditional Expression (18) to be equal to or less than the lower limit, the absolute value of Mp is prevented from becoming excessively large. Therefore, it is possible to suppress an increase in amount of movement of the lens group closest to the object side among the lens groups that have positive refractive powers and that are included in the subsequent group Gr. As a result, there is an advantage in achieving reduction in size. By not allowing the corresponding value of Conditional Expression (18) to be equal to or greater than the upper limit, the absolute value of Mp is prevented from becoming excessively small. As a result, there is an advantage in achieving a high zoom ratio. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (18-1), and it is yet more preferable to satisfy Conditional Expression (18-2). In the example of
−0.45<Mp/TLt<−0.06 (18)
−0.39<Mp/TLt<−0.12 (18-1)
−0.33<Mp/TLt<−0.15 (18-2)
[0097] In the zoom lens according to the present embodiment, assuming that a focal length of a lens group closest to the object side among lens groups that have positive refractive powers and that are included in the subsequent group Gr in a state in which the infinite distance object is in focus is fp, and a focal length of the second lens group G2 is f2, it is preferable to satisfy Conditional Expression (19). By not allowing the corresponding value of Conditional Expression (19) to be equal to or less than the lower limit, the absolute value of f2 is prevented from becoming excessively small. As a result, there is an advantage in suppressing fluctuations in various aberrations that occur during zooming. By not allowing the corresponding value of Conditional Expression (19) to be equal to or greater than the upper limit, the absolute value of f2 is prevented from becoming excessively large. As a result, there is an advantage in shortening the second lens group G2, and thus there is an advantage in achieving reduction in size. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (19-1), and it is yet more preferable to satisfy Conditional Expression (19-2). In the example of
−4.3<fp/f2<−1.1 (19)
−3.9<fp/f2<−1.5 (19-1)
−3.4<fp/f2<−1.95 (19-2)
[0098] In the zoom lens according to the present embodiment, assuming that a distance on the optical axis Z from a lens surface closest to the image side in the first lens group G1 to a lens surface closest to the object side in a lens group closest to the object side among lens groups that have positive refractive powers and that are included in the subsequent group Gr at the telephoto end in a state in which the infinite distance object is in focus is D1pt, and a sum of a back focal length in terms of an air conversion distance and a distance on the optical axis Z from the lens surface closest to the object side in the first lens group G1 to the lens surface closest to the image side in the subsequent group Gr, at the telephoto end in a state in which the infinite distance object is in focus is TLt, it is preferable to satisfy Conditional Expression (20). The lower part of
0.2<D1pt/TLt<0.5 (20)
0.25<D1pt/TLt<0.42 (20-1)
0.29<D1pt/TLt<0.39 (20-2)
[0099] As described above, in a case where the subsequent group Gr includes at least one Lx lens of which the image side lens surface is a convex surface being in contact with air, an optical system, which minimizes an absolute value of an inverse of a lateral magnification at the wide angle end in a case where an aperture stop St is used as an object point in a state in which the infinite distance object is in focus, in at least one optical system configured to range from a lens surface adjacent to the image side of the aperture stop St to the image side lens surface of the Lx lens is an A optical system. In the zoom lens according to the present embodiment, the focal length of the whole system at the wide angle end in a state in which the infinite distance object is in focus is fw, and a combined focal length at the wide angle end in a state in which the infinite distance object is in focus from a lens surface adjacent to the image side of the lens surface (that is, the A surface A) closest to the image side in the A optical system to a lens surface closest to the image side in the subsequent group Gr is fBw, it is preferable to satisfy Conditional Expression (21). By not allowing the corresponding value of Conditional Expression (21) to be equal to or less than the lower limit, there is an advantage in suppressing astigmatism on the wide angle side. By not allowing the corresponding value of Conditional Expression (21) to be equal to or greater than the upper limit, the negative refractive power from the lens surface adjacent to the image side of the A surface A to the lens surface closest to the image side in the subsequent group Gr can be strengthened. Therefore, the luminous flux diameter from the lens surface closest to the object side in the subsequent group Gr to the A surface A can be reduced. As a result, there is an advantage in achieving reduction in diameter. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (21-1), and it is yet more preferable to satisfy Conditional Expression (21-2).
−1.6<fw/fBw<−0.25 (21)
−1.3<fw/fBw<−0.37 (21-1)
−1.1<fw/fBw<−0.69 (21-2)
[0100] In the zoom lens according to the present embodiment, assuming that a focal length of the whole system at the wide angle end in a state in which the infinite distance object is in focus as fw, a maximum half angle of view at the wide angle end in a state in which the infinite distance object is in focus is tow, and a maximum image height at the wide angle end is Yw, it is preferable to satisfy Conditional Expression (22). By not allowing the corresponding value of Conditional Expression (22) to be equal to or less than the lower limit, the height of the off-axis ray passing through the lens closest to the object side in the first lens group G1 from the optical axis Z can be lowered on the wide angle side. As a result, there is an advantage in achieving reduction in diameter. By not allowing the corresponding value of Conditional Expression (22) to be equal to or greater than the upper limit, there is an advantage in suppressing various aberrations of the off-axis ray on the wide angle side. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (22-1), and it is yet more preferable to satisfy Conditional Expression (22-2).
0.97<fw×tan ωw/Yw<1.3 (22)
1<fw×tan ωw/Yw<1.19 (22-1)
1.02<fw×tan ωw/Yw<1.11 (22-2)
[0101] Assuming that a focal length of the first lens group G1 is f1 and a focal length of the second lens group G2 is f2, it is preferable that the zoom lens according to the present embodiment satisfies Conditional Expression (23). By not allowing the corresponding value of Conditional Expression (23) to be equal to or less than the lower limit, there is an advantage in achieving a high zoom ratio. By not allowing the corresponding value of Conditional Expression (23) to be equal to or greater than the upper limit, there is an advantage in suppressing fluctuations in various aberrations that occur during zooming. In order to obtain more favorable characteristics, it is more preferable that the zoom lens satisfies Conditional Expression (23-1), and it is yet more preferable to satisfy Conditional Expression (23-2).
−0.3<f2/f1<−0.05 (23)
−0.23<f2/f1<−0.1 (23-1)
−0.19<f2/f1<−0.14 (23-2)
[0102] The above-mentioned preferable configurations and available configurations including the configurations relating to Conditional Expressions may be any combination, and it is preferable to optionally adopt the configurations in accordance with required specification. It should be noted that Conditional Expressions that the zoom lens of the present disclosure preferably satisfies are not limited to Conditional Expressions described in the form of Expressions, and the lower limits and the upper limits are selected from the preferable, more preferable, and yet more preferable conditional expressions. Conditional Expressions may include all conditional expressions obtained through optional combinations. Further, the example shown in
[0103] For example, a preferred embodiment of the present disclosure is a zoom lens consisting of, in order from the object side to the image side: a first lens group G1 that has a positive refractive power, a second lens group G2 that has a negative refractive power, and a subsequent group Gr that has a plurality of lens groups. The zoom lens includes an aperture stop St at a position closer to the image side than a lens surface closest to the image side in the second lens group G2. A lens group closest to the image side in the subsequent group Gr includes at least one negative lens of which an object side lens surface is a concave surface being in contact with air. During zooming, a spacing between the first lens group G1 and the second lens group G2 changes, a spacing between the second lens group G2 and the subsequent group Gr changes, and spacings between all adjacent lens groups in the subsequent group Gr change. During zooming, lens spacings inside the first lens group G1, the second lens group G2, and the plurality of lens groups are unchanged. Thus, the zoom lens satisfies Conditional Expression (1).
[0104] Next, examples of the zoom lens of the present disclosure will be described, with reference to the drawings. The reference numerals attached to the lenses in the cross-sectional views of each example are used independently for each example in order to avoid complication of description and drawings due to an increase in number of digits of the reference numerals. Therefore, even in a case where common reference numerals are attached in the drawings of different examples, components do not necessarily have a common configuration.
Example 1
[0105]
[0106] Table 1 is noted as follows. The column of Sn shows surface numbers in a case where the surface closest to the object side is the first surface and the number is increased one by one toward the image side. The column of R shows a curvature radius of each surface. The column of D shows a surface spacing between each surface and the surface adjacent to the image side on the optical axis. The column of Nd shows a refractive index of each component at the d line. The column of νd shows an Abbe number of each component based on the d line. Table 1 also shows the aperture stop St, and in the column of the surface number of the surface corresponding to the aperture stop St, the surface number and (St) are noted. Further, in a cell of a surface number of a surface corresponding to the A surface A, the surface number and a term of (A) are noted. In Table 1, the sign of the curvature radius of the convex surface facing toward the object side is positive and the sign of the curvature radius of the convex surface facing toward the image side is negative. In Table 1, the symbol DD [ ] is used for each variable surface spacing during zooming, and the object side surface number of the spacing is given in [ ] and is noted in the column of D.
[0107] Table 2 shows the zoom magnification Zr, the focal length f of the whole system, the back focal length BF, the F number FNo., the maximum total angle of view 2ω, and the variable surface spacing during zooming. [° ] in the cell of 2ω indicates that the unit thereof is a degree. The values shown in Table 2 are values in the case of using the d line as a reference in a state in which the infinite distance object is in focus. In Table 2, the values in the wide angle end state, the middle focal length state, and the telephoto end state are shown in columns labeled WIDE, MIDDLE, and TELE, respectively.
[0108] In Table 1, a reference sign * is attached to surface numbers of aspherical surfaces, and numerical values of the paraxial curvature radius are written into the column of the curvature radius of the aspherical surface. In Table 3, the row of Sn shows surface numbers of the aspherical surfaces, and the rows of KA and Am (m is an integer of 3 or more) shows numerical values of the aspherical coefficients for each aspherical surface. The “E±n” (n is an integer) in numerical values of the aspherical coefficients of Table 3 indicates “10.sup.±n”. KA and Am are the aspherical coefficients in the aspherical surface expression represented by the following expression.
Zd=C×h.sup.2/{1+(1−KA×C.sup.2×h.sup.2).sup.1/2}+ΣAm×h.sup.m
[0109] Here,
[0110] Zd is an aspherical surface depth (a length of a perpendicular from a point on an aspherical surface at height h to a plane that is perpendicular to the optical axis and that is in contact with the vertex of the aspherical surface),
[0111] h is a height (a distance from the optical axis to the lens surface),
[0112] C is an inverse of the paraxial curvature radius,
[0113] KA and Am are aspherical coefficients, and
[0114] Σ in the aspherical surface expression means the sum with respect to m.
[0115] In the data of each table, degrees are used as a unit of an angle, and millimeters (mm) are used as a unit of a length, but appropriate different units may be used since the optical system can be used even in a case where the system is enlarged or reduced in proportion. Each of the following tables shows numerical values rounded off to predetermined decimal places.
TABLE-US-00001 TABLE 1 Example 1 Sn R D Nd vd 1 331.0255 1.4086 1.96300 24.11 2 88.5944 4.7137 1.53775 74.70 3 −327.9097 0.1002 4 84.3684 3.6596 1.86100 37.10 5 661.6761 DD[5] *6 270.9414 0.9002 1.85135 40.10 *7 24.3655 5.6395 8 −43.1327 0.8368 1.75500 52.32 9 47.5474 0.1011 10 39.9947 4.3384 1.82115 24.06 11 −45.3780 2.9388 12 −23.4967 0.8487 1.72987 57.58 13 −70.4345 DD[13] 14(St) ∞ 1.5007 *15 39.8220 4.2667 1.59201 67.02 *16 −73.3593 0.0998 17 34.6162 3.6545 1.48749 70.24 18 −658.8974 0.8566 1.80440 39.59 19 104.1638 1.2048 20 32.2697 0.8448 1.95234 33.43 21 23.2106 0.0998 22 23.2106 5.3984 1.48749 70.24 23 −75.4665 0.6567 24 −45.2596 0.8423 1.82200 46.62 25 92.5959 DD[25] 26 73.5219 3.4108 1.49700 81.54 27 −48.3043 0.8352 1.98326 31.02 28 −266.5243 2.3682 *29 −45.6318 1.7351 1.78436 51.87 *30 −35.1678 0.1021 *31 158.5781 6.0760 1.55032 75.50 *32(A) -24.2967 DD[32] 33 206.8111 3.3459 1.97722 31.65 34 −46.9241 0.9709 1.77823 46.56 35 35.1932 DD[35] 36 −19.7340 0.9490 1.49700 81.54 37 −41.9426
TABLE-US-00002 TABLE 2 Example 1 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 27.30 71.10 184.18 BF 14.5210 44.5024 64.6757 FNo. 3.49 4.10 5.70 2ω(°) 81.2 32.8 12.8 DD[5] 0.9373 22.3019 54.4095 DD[13] 20.4486 9.4941 1.4511 DD[25] 9.2638 2.7453 0.9930 DD[32] 5.1589 1.3608 0.9911 DD[35] 13.3318 17.1299 17.4996
TABLE-US-00003 TABLE 3 Example 1 Sn 6 7 15 16 KA 1.0000000 1.0000000 1.0000000 1.0000000 E+00 E+00 E+00 E+00 A3 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A4 9.0419287 6.9280608 −9.7505425 8.9930512 E−06 E−06 E−07 E−07 A5 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A6 −9.0649172 −1.4235140 3.0946976 −3.3689655 E−09 E−08 E−10 E−09 A7 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A8 −2.5429857 3.6567591 −2.3630929 −1.6029722 E−10 E−10 E−10 E−10 A9 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A10 4.1548506 −8.7339529 3.0939260 −1.5274232 E−12 E−12 E−13 E−12 A11 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A12 −2.3750206 1.1668810 1.0474635 2.7713383 E−14 E−13 E−14 E−14 A13 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A14 6.0966974 −6.3540808 −1.0562305 −1.7792667 E−17 E−16 E−16 E−16 A15 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A16 −5.8637514 1.1868286 2.6098193 3.7349026 E−20 E−18 E−19 E−19 Sn 29 30 31 32 KA 1.0000000 1.0000000 1.0000000 1.0000000 E+00 E+00 E+00 E+00 A3 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A4 −6.0401300 −2.1622590 3.8571099 −1.4361569 E−05 E−05 E−06 E−05 A5 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A6 6.5749656 9.7578529 −1.2779274 −1.8187831 E−08 E−08 E−08 E−08 A7 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A8 −9.7342327 −6.6836753 −1.9275502 1.8786514 E−10 E−10 E−11 E−10 A9 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A10 1.2276699 9.6679349 1.9236039 −1.1113493 E−11 E−12 E−13 E−12 A11 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A12 −4.0370775 −3.1010028 −6.6536598 2.5875067 E−14 E−14 E−16 E−15 A13 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A14 0.0000000 0.0000000 7.4538414 −1.5934823 E+00 E+00 E−18 E−18 A15 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A16 0.0000000 0.0000000 −2.1415715 1.2905219 E+00 E+00 E−20 E−20
[0116]
[0117] Symbols, meanings, description methods, and illustration methods of the respective data pieces according to Example 1 are the same as those in the following examples unless otherwise specified. Therefore, in the following description, repeated description will not be given.
Example 2
[0118]
[0119] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and five lenses L31 to L35, in order from the object side to the image side. The fourth lens group G4 consists of six lenses L41 to L46 in order from the object side to the image side. The fifth lens group G5 consists of one lens L51. The focus group consists of two lenses L45 and L46.
[0120] Regarding the zoom lens of Example 2, Table 4 shows basic lens data, Table 5 shows specifications and variable surface spacings, and Table 6 shows aspherical coefficients thereof.
TABLE-US-00004 TABLE 4 Example 2 Sn R D Nd vd 1 94.2986 1.4176 1.89286 20.36 2 63.3654 4.5098 1.59522 67.73 3 373.8168 0.0998 4 98.4414 2.8091 1.80400 46.53 5 332.3682 DD[5] *6 116.8746 1.3459 1.83481 42.74 *7 18.1975 5.9032 8 −97.6485 0.8292 1.82721 47.38 9 45.6157 0.0998 10 31.4850 4.5832 1.85896 22.73 11 −68.4772 2.0809 12 −30.1543 0.8516 1.82502 47.61 13 −2870.4505 DD[13] 14(St) ∞ 1.5002 *15 47.7458 2.1969 1.49700 81.54 *16 −263.2799 2.9472 17 40.7280 2.5484 1.49700 81.54 18 −818.8158 0.2323 19 25.2301 0.8582 1.60242 66.81 20 22.1342 0.7926 21 33.0430 5.5534 1.51823 58.90 22 −25.6413 0.0998 23 −28.0069 0.8643 1.76047 39.33 24 92.5896 DD[24] 25 70.1476 5.1409 1.43875 94.66 26 −21.4621 0.8486 1.88032 41.69 27 −77.6100 2.0795 *28 −39.7424 1.0898 1.87570 42.29 *29 −34.5887 0.0998 *30 128.6415 7.5100 1.48749 70.24 *31(A) −19.5233 0.9946 32 133.5257 3.1265 1.90191 39.55 33 −56.5553 0.8458 1.73923 56.60 34 41.3995 DD[34] 35 −19.8870 1.5002 1.62923 62.55 36 −55.7871
TABLE-US-00005 TABLE 5 Example 2 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 25.87 67.38 174.53 BF 21.0195 46.8049 56.6225 FNo. 3.5 5.05 5.80 2ω(°) 85.6 34.6 13.6 DD[5] 0.9766 20.7270 54.9698 DD[13] 23.5239 9.1717 1.4737 DD[24] 9.4594 3.5609 1.2093 DD[34] 13.6205 16.8386 18.9876
TABLE-US-00006 TABLE 6 Example 2 Sn 6 7 15 16 KA 1.0000000 1.0000000 1.0000000 1.0000000 E+00 E+00 E+00 E+00 A3 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A4 −5.0854245 −7.7702130 −1.4990912 −1.4995166 E−06 E−06 E−05 E−05 A5 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A6 4.7329307 −7.1725961 −1.9992757 −1.7162613 E−08 E−09 E−07 E−07 A7 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A8 −2.2317953 1.0581109 −1.9672269 −2.0005583 E−10 E−09 E−09 E−09 A9 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A10 1.3935294 −1.9120690 2.3349735 4.9436422 E−13 E−11 E−12 E−13 A11 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A12 2.6437173 1.4890578 3.2549821 3.0798971 E−15 E−13 E−14 E−15 A13 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A14 −9.5124017 −6.1043050 −1.6308454 −5.0060094 E−18 E−16 E−15 E−16 A15 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A16 1.0513469 1.0104097 1.6538290 −3.2764146 E−20 E−18 E−18 E−18 Sn 28 29 30 31 KA 1.0000000 1.0000000 1.0000000 1.0000000 E+00 E+00 E+00 E+00 A3 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A4 −5.7484792 −2.5522568 7.4579686 −4.9045419 E−05 E−05 E−06 E−06 A5 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A6 4.7243437 9.8159108 7.1531359 −7.8896578 E−08 E−08 E−09 E−09 A7 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A8 −1.0536171 −7.5077137 1.0694491 1.9017398 E−09 E−10 E−10 E−10 A9 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A10 9.2135585 9.4462274 4.2732218 −4.1903558 E−12 E−12 E−13 E−13 A11 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A12 −3.7046484 −4.1512455 −3.5921816 5.3383347 E−14 E−14 E−15 E−15 A13 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A14 0.0000000 0.0000000 1.1487541 −5.7859996 E+00 E+00 E−18 E−20 A15 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A16 0.0000000 0.0000000 3.3684259 2.0859008 E+00 E+00 E−20 E−20
[0121]
[0122] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and five lenses L31 to L35, in order from the object side to the image side. The fourth lens group G4 consists of six lenses L41 to L46 in order from the object side to the image side. The fifth lens group G5 consists of one lens L51. The focus group consists of two lenses L45 and L46.
[0123] Regarding the zoom lens of Example 3, Table 7 shows basic lens data, Table 8 shows specifications and variable surface spacings, and Table 9 shows aspherical coefficients thereof.
TABLE-US-00007 TABLE 7 Example 3 Sn R D Nd vd 1 91.3282 1.4284 1.89286 20.36 2 61.9165 4.5100 1.59522 67.73 3 325.4496 6.0998 4 101.4041 2.8345 1.80400 46.53 5 384.8026 DD[5] *6 177.4449 1.4529 1.84289 45.73 *7 19.4415 5.3265 8 −191.8075 0.8339 1.77104 53.27 9 39.8527 0.0998 10 31.1364 4.0268 1.85446 22.28 11 −147.6059 3.3001 12 −27.5174 0.8557 1.77149 53.22 13 −150.6664 DD[13] 14(St) ∞ 1.5002 *15 50.6217 2.1761 1.49700 81.54 *16 −145.7703 2.6260 17 42.6124 2.5526 1.48999 83.93 18 −357.4670 0.2323 19 33.4495 0.8537 1.72974 36.99 20 21.3700 0.1002 21 21.3700 6.9548 1.49001 59.70 22 −24.5126 0.1000 23 −28.9882 0.8581 1.73962 54.52 24 92.5909 DD[24] 25 74.8207 4.9864 1.43875 94.66 26 −21.4817 0.8488 1.89217 32.36 27 −91.2085 2.0449 *28 −41.7574 1.1892 1.88356 38.38 *29 −34.5054 0.1000 *30 117.7191 7.4485 1.49001 56.87 *31(A) −19.8258 0.9900 32 143.3168 2.9565 1.95733 30.87 33 −61.9237 0.8457 1.74704 43.40 34 39.9659 DD[34] 35 −19.3181 1.5002 1.57417 71.26 36 −56.9740
TABLE-US-00008 TABLE 8 Example 3 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 26.11 67.99 176.12 BF 20.2616 44.6536 54.8744 FNo. 3.5 5.01 5.81 2ω(°) 84.8 34.2 13.4 DD[5] 0.9883 22.3838 54.7510 DD[13] 24.0519 9.7002 1.4824 DD[24] 9.2299 3.0117 0.9801 DD[34] 13.6551 16.9137 19.3537
TABLE-US-00009 TABLE 9 Example 3 Sn 6 7 15 16 KA 1.0000000 1.0000000 1.0000000 1.0000000 E+00 E+00 E+00 E+00 A3 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A4 −2.7520703 −6.6555103 −1.4351117 −1.0642509 E−06 E−06 E−05 E−05 A5 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A6 5.0719388 7.0202052 −9.6200249 −8.7417248 E−08 E−09 E−08 E−08 A7 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A8 −2.2246578 1.0626091 −1.6772998 −1.4745334 E−10 E−09 E−09 E−09 A9 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A10 1.2475921 −1.8567018 1.9661601 2.7011696 E−13 E−11 E−12 E−12 A11 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A12 2.5922454 1.4963842 5.5997309 −2.4022057 E−15 E−13 E−14 E−14 A13 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A14 −9.5905620 −6.2890987 −1.6920000 −4.4423933 E−18 E−16 E−15 E−16 A15 0.0000000 0.0000000 0.0000000 0.0000000 E+00 E+00 E+00 E+00 A16 1.1099154 1.0605909 8.8397107 2.9172231 E−20 E−18 E−18 E−18 Sn 30 31 KA 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 A4 7.1510381E−06 −5.3385345E−06 A5 0.0000000E+00 0.0000000E+00 A6 6.0440286E−09 −8.7836339E−09 A7 0.0000000E+00 0.0000000E+00 A8 1.0472543E−10 2.0721547E−10 A9 0.0000000E+00 0.0000000E+00 A10 4.3006004E−13 −3.9425982E−13 A11 0.0000000E+00 0.0000000E+00 A12 −3.4899393E−15 5.3052749E−15 A13 0.0000000E+00 0.0000000E+00 A14 2.0601858E−18 −5.4434840E−19 A15 0.0000000E+00 0.0000000E+00 A16 3.0437374E−20 1.9122186E−20
[0124]
[0125] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and five lenses L31 to L35, in order from the object side to the image side. The fourth lens group G4 consists of four lenses L41 to L44, in order from the object side to the image side. The fifth lens group G5 consists of three lenses L51 to L53, in order from the object side to the image side. The focus group consists of two lenses L51 and L52.
[0126] Regarding the zoom lens of Example 4, Table 10 shows basic lens data, Table 11 shows specifications and variable surface spacings, and Table 12 shows aspherical coefficients thereof.
TABLE-US-00010 TABLE 10 Example 4 Sn R D Nd vd 1 76.8011 1.3135 1.85478 24.80 2 54.0634 3.9199 1.49700 81.54 3 173.9810 0.1000 4 78.4547 3.3337 1.67599 56.51 5 512.2216 DD[5] *6 66.7802 0.6249 1.95375 32.32 *7 21.3969 5.6912 8 −34.8672 0.9109 1.74790 55.69 9 31.5092 0.0999 10 31.0062 5.2412 1.84666 23.78 11 −53.1642 2.1059 12 −19.2919 0.8701 1.69691 59.22 13 −39.3029 DD[13] 14(St) ∞ 1.5002 *15 40.0266 3.9563 1.61239 64.39 *16 −139.8115 0.2480 17 35.7093 3.2235 1.49700 81.54 18 117.6130 0.7828 19 27.2537 0.8344 1.89214 40.57 20 16.8772 6.8805 1.49700 81.54 21 −259.8917 1.3002 22 −47.5312 0.8474 1.74492 56.01 23 92.4817 DD[23] 24 51.9548 3.8604 1.49700 81.54 25 −55.4556 0.8433 1.93840 19.79 26 906.5318 2.2491 *27 −69.1040 1.2628 1.84258 40.37 *28 −50.3927 0.1002 *29 74.1626 6.4522 1.66308 53.29 *30(A) −28.0967 DD[30] 31 45.3043 3.0828 1.91478 19.26 32 −632.4399 0.8369 1.94097 35.45 33 22.9727 13.4509 34 −44.4821 2.5002 1.70937 58.60 35 −220.7101
TABLE-US-00011 TABLE 11 Example 4 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 28.81 75.03 194.36 BF 17.3401 46.4248 65.0606 FNo. 3.49 4.21 5.71 2ω(°) 75.6 31.0 12.2 DD[5] 0.9961 18.1647 54.2307 DD[13] 19.5855 6.7824 1.6671 DD[23] 9.4304 2.3350 0.9915 DD[30] 2.2849 3.2393 0.9975
TABLE-US-00012 TABLE 12 Example 4 Sn 6 7 15 16 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 9.2029669E−06 4.8473432E−06 5.5131401E−06 6.5202376E−06 A5 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A6 9.7282928E−08 9.0764089E−08 2.0768593E−08 −1.3672107E−09 A7 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A8 −1.2940229E−09 6.1781382E−10 −3.1110859E−10 1.8313518E−10 A9 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A10 1.3634021E−11 −3.9966969E−11 1.3619354E−12 −4.9102808E−12 A11 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A12 −6.9599360E−14 7.1964354E−13 3.6679622E−15 4.8113603E−14 A13 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A14 1.3176501E−16 −5.5017541E−15 −5.0782568E−17 −2.1652307E−16 A15 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A16 9.5440166E−20 1.5831148E−17 1.5354112E−19 4.1016274E−19 Sn 27 28 29 30 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 −5.5818320E−05 −2.3551824E−05 4.3504970E−06 −6.3973755E−06 A5 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A6 9.0022274E−08 8.7742289E−08 −3.4779428E−08 −8.1191081E−09 A7 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A8 −9.1436181E−10 −7.5067163E−10 3.2460015E−11 1.8673881E−10 A9 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A10 1.2071908E−11 1.0179525E−11 2.5306137E−13 −1.0958144E−12 A11 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A12 −3.9955451E−14 −3.2395123E−14 −1.5025806E−15 2.2170398E−15 A13 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A14 0.0000000E+00 0.0000000E+00 9.5339743E−18 2.9230242E−19 A15 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A16 0.0000000E+00 0.0000000E+00 −1.6280576E−20 1.1684252E−20
Example 5
[0127]
[0128] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and five lenses L31 to L35, in order from the object side to the image side. The fourth lens group G4 consists of six lenses L41 to L46 in order from the object side to the image side. The focus group consists of two lenses L44 and L45.
[0129] Regarding the zoom lens of Example 5, Table 13 shows basic lens data, Table 14 shows specifications and variable surface spacings, and Table 15 shows aspherical coefficients thereof.
TABLE-US-00013 TABLE 13 Example 5 Sn R D Nd υd 1 120.8544 1.4084 1.84666 23.78 2 78.7720 4.0098 1.52841 76.45 3 1178.9254 0.0999 4 69.8826 3.5357 1.52841 76.45 5 274.9872 DD[5] *6 −79.1876 1.3146 1.85400 40.38 *7 44.8021 5.6689 8 −41.0337 1.0886 1.66304 60.84 9 27.8964 4.2081 1.84666 23.78 10 −73.6110 4.7367 11 −20.8709 0.8672 1.76352 54.06 12 −44.9746 DD[12] 13(St) ∞ 1.5001 *14 31.3766 3.5544 1.77533 33.14 *15 439.3222 0.4180 16 27.7954 3.2273 1.55032 75.50 17 85.6611 1.0081 18 32.7718 0.8482 1.97387 26.95 19 15.2287 5.9718 1.48999 57.95 20 4836.1549 1.4183 21 −43.3262 0.8631 1.83806 23.79 22 91.5792 DD[22] 23 33.9611 6.2775 1.49700 81.54 24 −31.5544 0.8444 1.96003 33.45 25 −94.7461 0.0998 *26 51.2884 6.3571 1.78124 36.32 *27(A) −33.1512 2.4529 28 58.2270 3.5591 1.97735 21.70 29 −108.9392 0.8509 1.91163 38.53 30 20.9832 15.6002 *31 −49.8976 3.1649 1.51001 63.47 *32 −131.3096
TABLE-US-00014 TABLE 14 Example 5 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 28.53 74.30 192.46 BF 17.3235 43.3374 73.2919 FNo. 3.5 4.09 5.75 2ω(°) 78 32.0 12.6 DD[5] 0.9940 26.9753 54.4024 DD[12] 19.2782 8.4771 1.4872 DD[22] 5.5083 2.2657 0.9998
TABLE-US-00015 TABLE 15 Example 5 Sn 6 7 14 15 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 2.4589350E−04 2.4350307E−04 5.5712322E−07 6.4337565E−06 A5 −2.4513510E−06 3.6544495E−06 8.0335468E−08 −1.0842651E−06 A6 −3.6922105E−06 −5.3938036E−06 1.9158322E−07 3.3059380E−07 A7 4.3236972E−08 3.9191979E−07 −2.7010346E−08 −6.4517780E−08 A8 6.2460880E−08 1.1357783E−08 −2.7244082E−09 3.2875282E−08 A9 −5.7534252E−09 −7.8583864E−10 4.7842471E−10 −1.3371233E−08 A10 1.8460870E−10 −2.0813309E−10 4.8790774E−11 2.9755526E−09 A11 −2.3491868E−11 2.0778393E−11 −9.2415441E−12 −3.9657778E−10 A12 3.5232180E−12 −4.7261390E−13 3.2659693E−14 3.3764626E−11 A13 −1.5499269E−13 −1.7869498E−13 4.4929083E−14 −1.8857632E−12 A14 −3.7225619E−15 3.3580100E−14 −8.2525714E−16 6.8494956E−14 A15 4.5742890E−16 −2.3269081E−15 −1.2331717E−16 −1.5123928E−15 A16 −9.5025188E−18 5.7012314E−17 4.4807943E−18 1.5886399E−17 Sn 26 27 31 32 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 −1.9490732E−05 8.8404673E−06 −3.6889097E−05 −4.5124313E−05 A5 −3.5575686E−07 −1.0526549E−06 −6.0497515E−06 −3.7222445E−06 A6 2.9061581E−07 1.9036179E−07 1.1463129E−06 8.5350455E−07 A7 −5.3572390E−08 −9.7785111E−09 −7.6210504E−08 −5.2729281E−08 A8 3.3482667E−09 −1.0469664E−09 −3.0371168E−09 −5.5039115E−09 A9 −1.6486957E−11 1.0152556E−11 9.5225976E−10 8.1518507E−10 A10 2.8507031E−11 1.9256934E−11 −1.6723948E−10 −1.0106683E−11 A11 −7.7225782E−12 −1.3094559E−12 1.4828393E−11 −2.3121063E−12 A12 5.6556435E−13 −1.7416538E−14 1.1936109E−12 7.3614270E−14 A13 9.3127657E−15 3.7829161E−15 −3.3874214E−13 −6.3349472E−15 A14 −3.6596332E−15 −2.0679251E−16 2.4596591E−14 1.0356282E−15 A15 2.0422965E−16 1.5366434E−17 −6.9688623E−16 −4.9353887E−17 A16 −3.9317101E−18 −5.2727592E−19 5.0456996E−18 6.6359189E−19
[0130]
[0131] The first lens group G1 consists of two lenses L11 and L12, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of the aperture stop St and four lenses L31 to L34, in order from the object side to the image side. The fourth lens group G4 consists of three lenses L41 to L43, in order from the object side to the image side. The fifth lens group G5 consists of one lens L51. The sixth lens group G6 consists of two lenses L61 and L62, in order from the object side to the image side. The focus group consists of one lens L51.
[0132] Regarding the zoom lens of Example 6, Table 16 shows basic lens data, Table 17 shows specifications and variable surface spacings, and Table 18 shows aspherical coefficients thereof.
TABLE-US-00016 TABLE 16 Example 6 Sn R D Nd υd 1 68.9522 1.3711 2.10420 17.02 2 59.8272 0.1625 3 62.1092 3.9515 1.74309 56.20 4 323.0079 DD[4] *5 110.3686 1.3102 1.72916 54.68 *6 20.6634 4.6707 7 −94.9541 0.8647 1.75799 54.64 8 33.2125 0.1498 9 28.5682 3.3818 1.80809 22.76 10 −618.9637 0.8510 11 −65.2670 0.8706 1.89425 38.05 12 −230.3568 DD[12] 13(St) ∞ 2.3641 *14 43.4819 3.5359 1.70343 38.81 *15 −284.5752 0.0998 16 26.0556 6.3024 1.43875 94.66 17 −32.7600 1.1180 1.95375 32.32 18 −92.8030 2.5928 19 −20.4593 1.4531 2.00100 29.14 20 −40.2354 DD[20] *21 −40.3994 1.1009 1.83481 42.74 *22 −57.5298 0.3345 23 216.1291 6.0259 1.49700 81.54 24 −21.6837 0.1999 25 −569.5860 5.6054 1.59522 67.73 26(A) −23.5710 DD[26] *27 199.4222 1.2238 1.76450 49.10 *28 28.5358 DD[28] 1.49700 81.54 29 −39.4070 1.0968 30 53.4970 3.5469 2.00330 28.27 31 548.7050
TABLE-US-00017 TABLE 17 Example 6 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 27.83 72.48 187.76 BF 17.2042 27.5828 94.0172 FNo. 3.57 4.10 5.95 2ω(°) 80 32.4 13.0 DD[4] 2.9998 32.6307 54.4028 DD[12] 21.5726 4.4738 2.2954 DD[20] 6.4399 2.1094 1.1094 DD[26] 7.7323 7.6408 0.9780 DD[28] 13.0818 22.4570 23.1482
TABLE-US-00018 TABLE 18 Example 6 Sn 5 6 14 15 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 −6.4249018E−21 −7.1967845E−06 9.6162431E−06 A4 2.1026947E−05 2.0761744E−05 1.4468207E−05 −5.9867173E−06 A5 −1.4114432E−07 1.9562647E−06 −1.6269960E−07 6.5258772E−07 A6 −9.8386607E−08 −3.1931032E−07 −3.2381520E−08 8.5121697E−08 A7 −9.1672421E−09 −2.8613068E−08 5.1702675E−09 −3.6300337E−08 A8 −7.4307947E−10 4.0916326E−09 8.5867673E−10 8.8186207E−10 A9 2.3238618E−10 3.3331082E−10 −4.1726342E−11 5.7160245E−10 A10 7.5349156E−12 −4.8526734E−11 −1.4395286E−11 −3.8720225E−11 A11 −2.0599610E−12 −2.2413528E−12 4.1436200E−13 −3.8268722E−12 A12 −1.3021207E−15 3.7479941E−13 7.8834817E−14 3.1568904E−13 A13 8.0142807E−15 7.7466528E−15 −2.0379720E−15 1.1723515E−14 A14 −1.4372652E−16 −1.4402879E−15 −2.0655696E−16 −1.0980583E−15 A15 −1.1580371E−17 −1.0837261E−17 2.8321841E−18 −1.3835591E−17 A16 3.4113539E−19 2.0765419E−18 2.0102878E−19 1.4275833E−18 Sn 21 22 27 28 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 −2.9217084E−05 −2.2340815E−05 1.0842022E−20 3.2526065E−20 A4 −1.5126058E−05 2.7221651E−05 3.4176984E−05 3.4632508E−05 A5 −1.0430132E−06 −7.4493367E−07 −8.7119831E−07 −4.8914551E−07 A6 1.0550829E−07 2.2261181E−07 −2.8331271E−07 −3.2177171E−07 A7 1.8182278E−08 2.5842665E−09 8.8305298E−09 7.0884935E−09 A8 −1.8393033E−09 −1.5658859E−09 1.5975322E−09 1.8717949E−09 A9 −1.1816726E−10 −3.0537621E−12 −2.4218835E−11 −1.1489588E−11 A10 1.1156753E−11 5.7152018E−12 −7.6106217E−12 −8.7400382E−12 A11 2.7832804E−13 −6.0948003E−15 −2.9586987E−14 −6.1158631E−14 A12 −2.0790051E−14 −8.4689739E−15 2.8523108E−14 2.8232902E−14 A13 2.4154602E−16 2.9693494E−16 A14 −6.0791539E−17 −4.6591881E−17 A15 −3.0121437E−19 −3.5582887E−19 A16 5.0894324E−20 2.7835806E−20
[0133]
[0134] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and six lenses L31 to L36, in order from the object side to the image side. The fourth lens group G4 consists of seven lenses L41 to L47, in order from the object side to the image side. The focus group consists of one lens L44. Unlike Example 1, the focus group of Example 7 moves to the object side during focusing from the infinite distance object to the close range object.
[0135] Regarding the zoom lens of Example 7, Table 19 shows basic lens data, Table 20 shows specifications and variable surface spacings, and Table 21 shows aspherical coefficients thereof.
TABLE-US-00019 TABLE 19 Example 7 Sn R D Nd υd 1 68.3456 1.3162 2.00069 25.46 2 48.8445 3.5186 1.55032 75.50 3 106.8906 0.9998 4 94.5686 3.1070 1.75510 54.94 5 5632.8687 DD[5] *6 165.5878 1.1780 1.83481 42.74 *7 24.3971 4.7370 8 −51.1304 0.9998 1.78787 51.50 9 44.4537 1.0000 10 34.9852 3.8064 1.82115 24.06 11 −45.3969 1.0002 12 −28.4552 0.9998 1.72658 57.74 13 92.5386 DD[13] 14(St) ∞ 1.5001 *15 31.5760 3.9074 1.56864 47.76 *16 −181.9429 0.9999 17 35.9428 3.5575 1.49700 81.61 18 −223.6162 1.0001 2.00101 29.16 19 104.1650 1.0000 20 25.0132 0.9998 1.83282 46.79 21 16.0514 7.1517 1.48749 70.44 22 −75.0865 1.0000 23 −36.8829 1.0002 1.69210 59.45 24 92.5905 DD[24] 25 35.1963 4.6500 1.45860 90.19 26 −52.2763 1.0002 1.99064 25.37 27 1034.9395 1.1261 *28 −109.2029 1.5763 1.81302 34.21 *29 −55.2880 4.2752 *30 32.3701 8.5104 1.61953 64.09 *31(A) −39.0916 1.0001 32 52.9140 3.2925 1.95928 33.53 33 −345.1503 1.0100 1.76154 54.26 34 19.7524 14.5739 35 −30.0149 1.0002 1.73014 57.56 36 −73.1071
TABLE-US-00020 TABLE 20 Example 7 WIDE MIDDLE TELE Zr 1.0 2.6 6.7 f 27.22 70.88 183.61 BF 16.7938 45.0036 73.5282 FNo. 3.49 4.09 5.71 2ω(°) 81.4 32.6 13.0 DD[5] 0.9998 24.5915 54.4017 DD[13] 16.3023 6.7787 1.5449 DD[24] 9.2205 3.8323 0.9888
TABLE-US-00021 TABLE 21 Example 7 Sn 6 7 15 16 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 5.1877887E−05 5.7032160E−05 1.7134069E−05 1.1896888E−06 A5 6.5670426E−07 −2.9287919E−07 −2.5279610E−05 7.8055330E−07 A6 −9.9499668E−07 −5.1575089E−07 1.6326617E−05 −6.7261373E−08 A7 6.5220992E−08 −1.6622123E−08 −5.6067274E−06 −5.0009412E−08 A8 7.1902265E−10 1.2720389E−09 1.1016895E−06 6.2986394E−09 A9 4.7907508E−10 1.6707789E−09 −1.1798063E−07 2.3514008E−09 A10 −8.3524058E−11 −1.3415373E−10 4.3471104E−09 −6.1085209E−10 A11 −3.4844914E−12 −6.5140834E−12 3.8183498E−10 1.6908350E−11 A12 1.1793441E−12 −5.1024330E−13 −3.7210273E−11 9.3206438E−12 A13 −5.2327471E−14 2.0360666E−13 −1.1944104E−12 −1.2728207E−12 A14 −1.9069886E−15 −2.0496203E−15 2.9439535E−13 6.2361398E−14 A15 1.9982285E−16 −1.1783024E−15 −1.4423102E−14 −7.2136846E−16 A16 −4.1101368E−18 4.9619108E−17 2.3767074E−16 −2.0587200E−17 Sn 28 29 30 31 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 −3.3955976E−05 −1.5249651E−05 −6.9287301E−06 3.8362374E−06 A5 1.1274565E−05 4.5174356E−06 −4.2973757E−07 1.2002836E−07 A6 −4.3420571E−06 −6.5937278E−07 −7.6976844E−08 −6.2756622E−08 A7 1.2386666E−06 −4.7392381E−08 2.3891788E−08 −6.1862009E−11 A8 −2.7461856E−07 2.1737316E−08 −5.3572276E−10 1.5770236E−09 A9 4.4473735E−08 −6.7476934E−10 −3.7230339E−10 −5.8959514E−11 A10 −4.7758380E−09 −2.7182627E−10 5.4872335E−11 −1.8861749E−11 A11 3.1176973E−10 2.2461096E−11 −3.9086131E−12 1.4074700E−12 A12 −1.3199123E−11 −1.9445621E−13 1.3039265E−13 6.4075572E−14 A13 8.8527890E−13 1.9203389E−13 6.8281587E−15 −6.3344389E−15 A14 −9.0142326E−14 −3.8923481E−14 −1.1830366E−15 −3.3111279E−16 A15 4.9666166E−15 2.4841208E−15 6.0439716E−17 3.9527993E−17 A16 −1.0244251E−16 −5.3990374E−17 −1.1039294E−18 −9.2151824E−19
Example 8
[0136]
[0137] The first lens group G1 consists of three lenses L11 to L13, in order from the object side to the image side. The second lens group G2 consists of four lenses L21 to L24, in order from the object side to the image side. The third lens group G3 consists of an aperture stop St and five lenses L31 to L35, in order from the object side to the image side. The fourth lens group G4 consists of six lenses L41 to L46 in order from the object side to the image side. The focus group consists of two lenses L44 and L45.
[0138] Regarding the zoom lens of Example 8, Table 22 shows basic lens data, Table 23 shows specifications and variable surface spacings, and Table 24 shows aspherical coefficients thereof.
TABLE-US-00022 TABLE 22 Example 8 Sn R D Nd υd 1 128.9392 1.4289 1.84666 23.78 2 75.8357 3.7290 1.52841 76.45 3 579.7203 0.1002 4 70.4460 3.0496 1.63995 54.13 5 268.1538 DD[5] *6 −91.6351 1.4882 1.88202 37.22 *7 39.7641 6.3984 8 −35.5668 0.9711 1.65480 61.24 9 29.2320 4.2153 1.84666 23.78 10 −67.5262 5.5435 11 −20.7318 0.8791 1.77224 53.14 12 −39.0867 DD[12] 13(St) ∞ 1.4998 *14 30.9632 3.7210 1.78487 47.90 *15 394.8815 0.1002 16 27.3611 4.4143 1.57260 71.49 17 82.2648 0.1145 18 32.6139 1.0024 1.98420 28.25 19 14.7907 6.7826 1.49000 56.88 20 −81939.3504 1.6201 21 −41.7290 0.8581 1.83069 46.29 22 92.2691 DD[22] 23 33.3917 6.6373 1.50349 81.90 24 −31.5654 0.8837 1.94697 33.90 25 −91.9956 0.0998 *26 52.2276 6.5463 1.77614 52.73 *27(A) −33.6763 1.3060 28 57.6224 4.1762 1.98956 21.84 29 −94.2052 0.9518 1.93352 36.23 30 21.6482 15.6002 *31 −48.3506 3.3645 1.51633 64.06 *32 −113.3578
TABLE-US-00023 TABLE 23 Example 8 WIDE MIDDLE TELE Zr 1.0 2.4 5.8 f 27.27 65.82 158.14 BF 16.2223 42.3725 68.8554 FNo. 3.5 4.09 5.71 2ω(°) 80.2 36.0 15.4 DD[5] 0.9973 21.3287 49.8494 DD[12] 17.9529 7.4497 1.4898 DD[22] 5.3857 2.2104 0.9966
TABLE-US-00024 TABLE 24 Example 8 Sn 6 7 14 15 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 2.0645694E−04 2.1722228E−04 2.7383011E−06 8.4498736E−06 A5 1.1133536E−05 5.6892667E−06 −1.2003285E−07 −1.8903756E−06 A6 −9.8551481E−06 −6.6432828E−06 −7.1613485E−08 5.3922288E−07 A7 1.8325493E−06 1.0830564E−06 4.7866771E−08 −7.2789796E−08 A8 −2.0648927E−07 −1.4376382E−07 −1.2040299E−08 2.2084039E−09 A9 1.1961611E−08 1.9373033E−08 1.6182252E−09 5.1984767E−10 A10 4.3585542E−10 −2.0779092E−09 −1.2831347E−10 −3.6871169E−11 A11 −1.2564221E−10 1.6102768E−10 1.1047386E−11 −2.3769924E−12 A12 5.8443660E−12 −9.7109616E−12 −1.7460898E−12 1.5823043E−13 A13 3.1440881E−13 5.0888495E−13 2.0553776E−13 1.7117526E−14 A14 −4.4337613E−14 −2.3269420E−14 −1.3002413E−14 −1.0079318E−15 A15 1.7823159E−15 7.9085890E−16 4.0488604E−16 −3.3778985E−17 A16 −2.5683728E−17 −1.3702066E−17 −4.7635459E−18 2.1742752E−18 Sn 26 27 31 32 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 −1.6316232E−05 9.7614767E−06 −4.7682149E−05 −4.6378152E−05 A5 −2.0392103E−06 −1.9028949E−06 −1.6469488E−06 −3.9449178E−06 A6 5.0573049E−07 4.3725090E−07 −2.5485254E−07 9.1921917E−07 A7 −6.9662086E−08 −8.1361261E−08 2.3501599E−07 −5.8313375E−08 A8 4.6335441E−09 1.1136256E−08 −4.3985894E−08 −4.0193222E−09 A9 1.5102016E−10 −8.8152244E−10 3.0183602E−09 6.2062123E−10 A10 −6.0614961E−11 1.2445456E−11 3.4043528E−11 −1.7443976E−12 A11 4.3123332E−12 2.6252836E−12 −1.3817648E−11 −1.6220335E−12 A12 −8.7270345E−14 −2.9628136E−14 3.0201114E−13 −1.1558761E−13 A13 1.2402659E−14 −1.4494018E−14 3.7899487E−14 1.3593337E−14 A14 −2.4979974E−15 5.2279038E−16 −4.0606498E−15 6.1724864E−18 A15 1.5882642E−16 1.8187197E−17 2.5042581E−16 −2.6266586E−17 A16 −3.3947965E−18 −9.0637881E−19 −6.8852908E−18 5.3414769E−19
[0139] Tables 25 and 26 show corresponding values of Conditional Expressions (1) to (23) of the zoom lenses of Examples 1 to 8.
TABLE-US-00025 TABLE 25 Expres- sion Con- ditional Exam- ple 1 Exam- ple 2 Exam- ple 3 Exam- ple 4 (1) fw/Denw 1.0979 1.0195 1.0032 1.1631 (2) fw/Dexw 0.5077 0.4462 0.4593 0.5195 (3) D1/TLt 0.0483 0.0445 0.0450 0.0430 (4) ft/fw 6.7460 6.7460 6.7460 6.7460 (5) 1/βA 0.09009 0.03173 0.05946 −0.04274 (6) HAt/HSt 1.0182 1.1930 1.1521 0.9797 (7) ft/fpAt 6.6383 6.3534 6.4079 7.3657 (8) HAt/ HAw 0.9335 0.9636 0.9444 0.9368 (9) DSAt/ DSLt 0.2832 0.3024 0.3063 0.2914 (10) dA/Yt 0.0458 0.0460 0.0458 0.0461 (11) TLt/ft 1.1115 1.1380 1.1190 1.0361 (12) BFw/Yw 0.6714 0.9718 0.9367 0.8017 (13) υ1 24.11 20.36 20.36 24.80 (14) N1 1.96300 1.89286 1.89286 1.85478 (15) N2n 1.85135 1.83481 1.84289 1.95375 (16) N2p 1.82115 1.85896 1.85446 1.84666 (17) υnL 81.54 62.55 71.26 58.60 (18) Mp/TLt −0.2046 −0.1647 −0.1627 −0.1887 (19) fp/2 −2.0758 −2.3380 −2.2215 −2.2138 (20) D1pt/TLt 0.3564 0.3707 0.3736 0.3622 (21) fw/fBw −0.7655 −0.7706 −0.7721 −0.9918 (22) fw × tanωw/ Yw 1.0822 1.1073 1.1027 1.0338 (23) f2/f1 −0.1708 −0.1539 −0.1566 −0.1645
TABLE-US-00026 TABLE 26 Expres- sion Con- ditional Exam- ple 5 Exam- ple 6 Exam- ple 7 Exam- ple 8 (1) fw/Denw 1.0748 1.0610 1.1529 1.0763 (2) fw/Dexw 0.4907 0.4129 0.4332 0.4653 (3) D1/TLt 0.0421 0.0238 0.0412 0.0398 (4) ft/fw 6.7460 6.7460 6.7460 5.8000 (5) 1/βA 0.09258 −0.06928 −0.32583 0.08323 (6) HAt/HSt 1.0059 1.2988 1.1296 0.9705 (7) ft/fpAt 7.5436 7.3947 6.3280 6.0899 (8) HAt/ HAw 1.1893 1.2362 0.8143 1.0474 (9) DSAt/ DSLt 0.2523 0.2043 0.3191 0.2723 (10) dA/Yt 0.1134 0.0452 0.0462 0.0604 (11) TLt/ft 1.1178 1.2257 1.1833 1.3195 (12) BFw/Yw 0.8009 0.7954 0.7764 0.7500 (13) υ1 23.78 17.02 25.46 23.78 (14) N1 1.84666 2.10420 2.00069 1.84666 (15) N2n 1.85400 1.72916 1.83481 1.88202 (16) N2p 1.84666 1.80809 1.82115 1.84666 (17) υnL 63.47 28.27 57.56 64.06 (18) Mp/TLt −0.2392 −0.3250 −0.2232 −0.2312 (19) fp/2 −2.9251 −3.1878 −2.5696 −2.7892 (20) D1pt/TLt 0.3499 0.3092 0.3276 0.3466 (21) fw/fBw −0.9309 −0.8129 −0.9682 −0.8495 (22) fw × tanωw/ Yw 1.0682 1.0802 1.0816 1.0603 (23) f2/f1 −0.1527 −0.1776 −0.1381 −0.1489
[0140] As can be seen from the data described above, the zoom lenses of Examples 1 to 8 have a zoom ratio of 5.5 times or more and are configured to be small-size and lightweight while achieving a high zoom ratio.
[0141] Next, an imaging apparatus according to an embodiment of the present disclosure will be described.
[0142] The camera 30 comprises a camera body 31, and a shutter button 32 and a power button 33 are provided on an upper surface of the camera body 31. Further, an operating part 34, an operating part 35, and a display unit 36 are provided on a rear surface of the camera body 31. The display unit 36 is able to display a captured image and an image within an angle of view before imaging.
[0143] An imaging aperture, through which light from an imaging target is incident, is provided at the center on the front surface of the camera body 31. A mount 37 is provided at a position corresponding to the imaging aperture. The interchangeable lens 20 is mounted on the camera body 31 with the mount 37 interposed therebetween.
[0144] In the camera body 31, there are provided an imaging element, a signal processing circuit, a storage medium, and the like. The imaging element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) outputs a captured image signal based on a subject image which is formed through the interchangeable lens 20. The signal processing circuit generates an image through processing of the captured image signal which is output from the imaging element. The storage medium stores the generated image. The camera 30 is able to capture a still image or a video in a case where the shutter button 32 is pressed, and is able to store image data, which is obtained through imaging, in the storage medium.
[0145] The technique of the present disclosure has been hitherto described through embodiments and examples, but the technique of the present disclosure is not limited to the above-mentioned embodiments and examples, and may be modified into various forms. For example, values such as the curvature radius, the surface spacing, the refractive index, the Abbe number, and the aspherical coefficient of each lens are not limited to the values shown in the numerical examples, and different values may be used therefor.
[0146] Further, the imaging apparatus according to the embodiment of the present disclosure is not limited to the above example, and may be modified into various forms such as a camera other than the mirrorless type, a film camera, and a video camera.