Zoom lens and imaging apparatus

Abstract

A zoom lens includes: a first lens group having a positive refractive power which is fixed while changing magnification; two or more movable lens groups that move independently from each other while changing magnification; and a final lens group having a positive refractive power which is fixed while changing magnification, provided in this order from an object side. The zoom lens satisfying Conditional Formula (1) below:
1.30<h/(Yimg.Math.tan )<2.37(1).

Claims

1. A zoom lens, comprising: a first lens group having a positive refractive power which is fixed while changing magnification; two or more movable lens groups that move independently from each other while changing magnification; and a final lens group having a positive refractive power which is fixed while changing magnification, provided in this order from an object side; the zoom lens satisfying Conditional Formula (1) below:
1.30<h/(Yimg.Math.tan )<2.37(1) wherein h is the height at which a chief ray of light having a maximum image height enters a first surface at a wide angle end, Yimg is the maximum image height, and is the half angle of view at the wide angle end.

2. A zoom lens as defined in claim 1, wherein: the first lens group comprises an eleven lens group having a negative refractive power, a twelve lens group having a positive refractive power, and a thirteen lens group having a positive refractive power; and the twelve lens group moves to perform focusing operations.

3. A zoom lens as defined in claim 2 that satisfies Conditional Formula (3) below:
1.95<f13/f1<3.00(3) wherein f1 is the focal length of the first lens group, and f13 is the focal length of the thirteen lens group.

4. A zoom lens as defined in claim 2 that satisfies Conditional Formula (4) below:
2.20<f11/Yimg<1.50(4) wherein f11 is the focal length of the eleven lens group, and Yimg is a maximum image height.

5. A zoom lens as defined in claim 2, wherein: the twelve lens group comprises two pairs of cemented lenses.

6. A zoom lens as defined in claim 5, wherein: the two pairs of cemented lenses are a cemented lens formed by a positive lens and a negative lens, and a cemented lens formed by a negative lens and a positive lens, provided in this order from the object side.

7. A zoom lens as defined in claim 2 that satisfies Conditional Formula (2-1) below:
1.530<n1a<1.665(2-1) wherein n1a is the average refractive index of the eleven lens group with respect to the d line.

8. A zoom lens as defined in claim 2 that satisfies Conditional Formula (3-1) below:
2.10<f13/f1<2.90(3-1) wherein f1 is the focal length of the first lens group, and f13 is the focal length of the thirteen lens group.

9. A zoom lens as defined in claim 2 that satisfies Conditional Formula (3-2) below:
2.20<f13/f1<2.80(3-2) wherein f1 is the focal length of the first lens group, and f13 is the focal length of the thirteen lens group.

10. A zoom lens as defined in claim 2 that satisfies Conditional Formula (4-1) below:
2.10<f11/Yimg<1.60(4-1) wherein f11 is the focal length of the eleven lens group, and Yimg is a maximum image height.

11. A zoom lens as defined in claim 2 that satisfies Conditional Formula (4-2) below:
2.00<f11/Yimg<1.65(4-2) wherein f11 is the focal length of the eleven lens group, and Yimg is a maximum image height.

12. A zoom lens as defined in claim 1, wherein: a second lens group having a negative refractive power and a third lens group having a negative refractive power are provided in this order from the object side as the movable lens groups.

13. A zoom lens as defined in claim 1, wherein: a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power are provided in this order from the object side as the movable lens groups.

14. A zoom lens as defined in claim 1 that satisfies Conditional Formula (1-1) below:
1.70<h/(Yimg.Math.tan )<2.37(1-1) wherein h is the height at which a chief ray of light having a maximum image height enters a first surface at a wide angle end, Yimg is the maximum image height, and is the half angle of view at the wide angle end.

15. An imaging apparatus equipped with the zoom lens defined in claim 1.

16. A zoom lens, comprising: a first lens group having a positive refractive power which is fixed while changing magnification; two or more movable lens groups that move independently from each other while changing magnification; and a final lens group having a positive refractive power which is fixed while changing magnification, provided in this order from an object side; the first lens group comprising an eleven lens group having a negative refractive power, a twelve lens group having a positive refractive power, and a thirteen lens group having a positive refractive power; the twelve lens group moving to perform focusing operations; and the zoom lens satisfying Conditional Formula (2) below:
1.530<n1a<1.670(2) wherein n1a is the average refractive index of the eleven lens group with respect to the d line, wherein, a second lens group having a negative refractive power and a third lens group having a negative refractive power are provided in this order from the object side as the movable lens groups.

17. A zoom lens as defined in claim 16 that satisfies Conditional Formula (3) below:
1.95<f13/f1<3.00(3) wherein f1 is the focal length of the first lens group, and f13 is the focal length of the thirteen lens group.

18. A zoom lens as defined in claim 16 that satisfies Conditional Formula (4) below:
2.20<f11/Yimg<1.50(4) wherein f11 is the focal length of the eleven lens group, and Yimg is a maximum image height.

19. An imaging apparatus equipped with the zoom lens defined in claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a collection of sectional diagrams that illustrate a first example of the configuration of a zoom lens according to an embodiment of the present invention (which is common with Example 1).

(2) FIG. 2 is a diagram that illustrates the paths of light rays that pass through the zoom lens according to the embodiment of the present invention (which is common with Example 1).

(3) FIG. 3 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 2.

(4) FIG. 4 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 3.

(5) FIG. 5 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 4.

(6) FIG. 6 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 5.

(7) FIG. 7 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 6.

(8) FIG. 8 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to Example 7.

(9) FIG. 9 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 1.

(10) FIG. 10 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 2.

(11) FIG. 11 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 3.

(12) FIG. 12 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 4.

(13) FIG. 13 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 5.

(14) FIG. 14 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 6.

(15) FIG. 15 is a collection of diagrams (A through L) that illustrate aberrations of the zoom lens of Example 7.

(16) FIG. 16 is a schematic diagram that illustrates the configuration of an imaging apparatus according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

(17) Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a collection of sectional diagrams that illustrate the configuration of a zoom lens according to an embodiment of the present invention. FIG. 2 is a diagram that illustrates the paths of light rays that pass through the lens of FIG. 1. The example of the configuration illustrated in FIG. 1 and FIG. 2 is the same as the configuration of a zoom lens of Example 1 to be described later. In FIG. 1 and FIG. 2, the left side is the object side and the right side is the image side. In addition, FIG. 2 illustrates an axial light beam wa and a light beam wb at a maximum angle of view.

(18) As illustrated in FIG. 1 and FIG. 2. This zoom lens is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, two or more movable lens groups (a second lens group G2 and a third lens group G3 in the present embodiment) that move independently from each other while changing magnification, an aperture stop St, and a final lens group (a fourth lens group G4 in the present embodiment) having a positive refractive power which is fixed while changing magnification, provided in this order along an optical axis Z from the object side. Note that the aperture stop St does not necessarily represent the size or the shape thereof, but the position thereof along the optical axis Z.

(19) When this zoom lens is applied to an imaging apparatus, it is preferable for a cover glass, a prism, and various filters, such as an infrared cutoff filter and a low pass filter, to be provided between the optical system and an imaging surface Sim, depending on the configuration of the camera to which the lens is mounted. Therefore, FIG. 1 and FIG. 2 illustrate an example in which a plane parallel plate shaped optical member PP that presumes such filters is provided between the lens system and the imaging surface Sim.

(20) The first lens group G1 comprises a 11 lens group G11 having a negative refractive power, a 12 lens group G12 having a positive refractive power, and a 13 lens group G13, provided in this order from the object side. The 12 lens group G12 is configured to move to perform focusing operations. By adopting such a configuration, variations in the angle of view due to focusing operations can be suppressed.

(21) In addition, the zoom lens is configured to satisfy Conditional Formula (1) below. By the value of h/(Yimg.Math.tan ) not exceeding the upper limit defined in Conditional Formula (1), the diameter of the 11 lens group G11 can be prevented from becoming excessively large, which contributes to miniaturization and a reduction in weight. In addition, a configuration in which the value of h/(Yimg.Math.tan ) is not less than the lower limit defined in Conditional Formula (1) is advantageous from the viewpoint of correcting field curvature and distortion. Note that more favorable properties can be achieved if the zoom lens satisfies Conditional Formula (1-1) below.
1.30<h(Yimg.Math.tan )<2.37(1)
1.70<h/(Yimg.Math.tan )<2.37(1-1)

(22) wherein h is the height at which a chief ray of light having a maximum image height enters a first surface at a wide angle end, Yimg is the maximum image height, and is the half angle of view at the wide angle end.

(23) In addition, the zoom lens is configured to satisfy Conditional Formula (2) below. By the value of n1a not exceeding the upper limit defined in Conditional Formula (2), the specific weight of glass materials can be prevented from becoming excessively large, which contributes to a reduction in weight. In addition, a configuration in which the value of n1a is not less than the lower limit defined in Conditional Formula (2) is not only advantageous from the viewpoint of correcting field curvature and lateral chromatic aberration, but also can prevent the outer diameter and the thickness of the 11 lens group G11 from becoming excessively large, which contributes to miniaturization and a reduction in weight. Note that more favorable properties car, be achieved if the zoom lens satisfies Conditional Formula (2-1) below.
1.530<n1a<1.670(2)
1.530<n1a<1.665(2-1)

(24) wherein n1a is the average refractive index of the 11 lens group with respect to the d line.

(25) In the zoom lens of the present embodiment, an example is being described in which the second lens group G2 having a negative refractive power and the third lens group G3 having a negative refractive power, provided in this order from the object side, are the movable lens groups. Alternatively, the zoom lens having a five group configuration as a whole, in which the movable lens groups are a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, provided in this order from the object side.

(26) In addition, it is preferable for Conditional Formula (3) below to be satisfied. A configuration in which the value of f13/f1 does not exceed the upper limit defined in Conditional Formula (3) is not only advantageous from the viewpoint of correcting spherical aberration and field curvature, but also advantageous from the viewpoint of correcting spherical aberration and field curvature during focusing operations, and further can suppress variations in the angle of view during focusing operations. In addition, by the value of f13/f1 is not less than the lower limit defined in Conditional Formula (3), variations in the angle of view during focusing operations can be decreased, and the amount of movement necessary to perform focusing operations can be prevented from becoming excessively large, which contributes to miniaturization and a reduction in weight. Note that more favorable properties can be achieved if the zoom lens satisfies Conditional Formula (3-1) below, and more preferably Conditional Formula (3-2) below.
1.95<f13/f1<3.00(3)
2.10<f13/f1<2.90(3-1)
2.20<f13/f1<2.80(3-2)

(27) wherein f1 is the focal length of the first lens group, and f13 is the focal length of the 13 lens group.

(28) In addition, it is preferable for Conditional Formula (4) below to be satisfied. A configuration in which the value of f11/Yimg does not exceed the upper limit defined in Conditional Formula (4) is not only advantageous from the viewpoint of correcting astigmatism, field curvature, and distortion, but also can prevent the diameters of the 12 lens group G12 and the 13 lens group G13 from becoming excessively large, which contributes to miniaturization and a reduction in weight. In addition, a configuration in which the value of f11/Yimg is not less than the lower limit defined in Conditional Formula (4) is advantageous from the viewpoint of correcting spherical aberration and field curvature. Note that more favorable properties can be achieved if the zoom lens satisfies Conditional Formula (4-1) below, and more preferably Conditional Formula (4-2) below.
2.20<f11/Yimg<1.50(4)
2.10<f11/Yimg<1.60(4-1)
2.00<f11/Yimg<1.65(4-2)

(29) wherein f11 is the focal length of the 11 lens group, and Yimg is a maximum image height.

(30) In addition, it is preferable for the 12 lens group to comprise two pairs of cemented lenses. By adopting such a configuration, variations in spherical aberration, longitudinal chromatic aberration, and lateral chromatic aberration during focusing operations can be suppressed.

(31) In this case, it is preferable for the two pairs of cemented lenses of the 12 lens group to be a cemented lens formed by a positive lens and a negative lens, and a cemented lens formed by a negative lens and a positive lens, provided in this order from the object side. Such a configuration is advantageous from the viewpoint of correcting longitudinal chromatic aberration and lateral chromatic aberration.

(32) In addition, it is preferable for the surface most toward the object side within the first lens group and the surface toward the object side of the lens second from the object side to be aspherical. By adopting such a configuration, correction of astigmatism, field curvature, and distortion is facilitated, and such a configuration is also advantageous from the viewpoint of miniaturization.

(33) In the present zoom lens, a specific preferred material of the component provided most toward the object side is glass. Alternatively, a transparent ceramic material may be employed.

(34) In the case that the present zoom lens is to be utilized in an environment in which the zoom lens is likely to be damaged, it is preferable for a protective multiple layer film coating to be administered. Further, a reflection preventing coating may be administered in order to reduce the amount of ghost light during use, in addition to the protective coating.

(35) In addition, FIG. 1 illustrates an example in which the optical member PP is provided between the lens system and the imaging surface Sim. Alternatively, various filters such as low pass filters and filters that cut off specific wavelength bands may be provided among each of the lenses instead of being provided between the lens system and the imaging surface Sim. As a further alternative, coatings that have the same functions as the various filters may be administered on the surfaces of the lenses.

(36) Next, examples of numerical values of the zoom lens of the present invention will be described.

(37) First, the zoom lens of Example 1 will be described. FIG. 1 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 1. Note that the optical member PP is also illustrated, the left side is the object side, the right side is the image side, and the aperture stop St in the drawings do not necessarily represent the size or the shape thereof, but the position thereof along the optical axis Z, in FIG. 1 and FIGS. 3 through 8 that correspond to Examples 2 through 7 to be described later.

(38) The zoom lens of Example 1 is constituted by the first lens group G1 having a positive refractive power which is fixed while changing magnification, two the second lens group G2 that moves while changing magnification, the third lens group G3 that moves while changing magnification, and the fourth lens group G4 (final lens group) having a positive refractive power which is fixed while changing magnification.

(39) Basic lens data are shown in Table 1, data related to various items are shown in Table 2, data related to the distances among movable surfaces are shown in Table 3, and aspherical surface coefficients are shown in Table 4, for the zoom lens of Example 1. In the following description, the meanings of the symbols in the tables will be described for Example 1. The meanings of the symbols are basically the same for Examples 2 through 7.

(40) In the lens data of Table 1, ith (i=1, 2, 3, . . . ) lens surface numbers that sequentially increase from the object side to the image side, with the lens surface at the most object side designated as first, are shown in the column Si. The radii of curvature of ith surfaces are shown in the column Ri, the distances between an ith surface and an i+1st surface along the optical axis Z are shown in the column Di. The refractive indices of jth (j=1, 2, 3, . . . ) optical elements that sequentially increase from the object side to the image side, with the optical element at the most object side designated as first, with respect to the d line (wavelength: 587.6 nm) are shown in the column Ndj. The Abbe's numbers of the jth optical element with respect to the d line are shown in the column vdj. The partial dispersion ratios of jth optical elements (j=1, 2, 3, . . . ) that sequentially increase from the object side to the image side, with the optical element at the most object side designated as first, are shown in the column gFj.

(41) Note that the partial dispersion ratio gF is represented by the following formula.
gF=(NgNF)/(NFNC)

(42) wherein Ng is the refractive index with respect to the g line, NF is the refractive index with respect to the F line, and NC is the refractive index with respect to the C line.

(43) Here, the signs of the radii of curvature are positive in cases that the surface shape is convex toward the object side, and negative in cases that the surface shape is convex toward the image side. The aperture stop St and the optical member PP are also included in the basic lens data. Text reading (aperture stop) is indicated along with a surface number in the column of the surface numbers at the surface corresponding to the aperture stop. In addition, DD [i] is indicated in the column of the distances for distances that change while changing magnification. In addition, the lowermost value in the column Di is the distance between the surface of the optical member PP toward the image side and the imaging surface Sim.

(44) Table 2 shows the values of the zoom magnification rates of the entire system, the focal lengths f (mm), the back focus Bf, F values (F No.), the angles of view (2), at the wide angle end, at an intermediate position, and at the telephoto end, respectively, as well as the maximum image height at the wide angle end, as the data related to various items.

(45) In the basic lens data, the data related to various items, and the data related to the movable surfaces, am are used as the units for lengths and degrees are used as the units for angles. However, it is possible for optical systems to be proportionately enlarged or proportionately reduced and utilized. Therefore, other appropriate units may be used.

(46) In the lens data of Table 1, the symbol * is appended to the surface numbers of aspherical surfaces, and numerical values that represent the paraxial radii of curvature are shown as the radii of curvature of the aspherical surfaces. The data of Table 4 related to aspherical surface coefficients show the surface numbers of the aspherical surfaces and aspherical surface coefficients related to the aspherical surfaces. The aspherical coefficients are the values of coefficients KA and Am (m=3, 4, 5, . . . , 20) in formula (A) below.
Zd=C.Math.h.sup.2/{1+(1KA.Math.C.sup.2.Math.h.sup.2).sup.1/2}+Am.Math.h.sup.m(A)

(47) wherein: Zd is the depth of the aspherical surface (the length of a normal line from a point on the aspherical surface at a height h to a plane perpendicular to the optical axis in contact with the peak of the aspherical surface), h is height (the distance from the optical axis), C is the inverse of the paraxial radius of curvature, and KA and Am (m=3, 4, 5, . . . , 20) are aspherical surface coefficients.

(48) TABLE-US-00001 TABLE 1 Example 1: Lens Data Ndi g, Fj Si Ri (Re- dj (Partial (Surface (Radius of Di fractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 409.9270 4.5006 1.58313 59.38 0.5435 2 31.9478 17.0179 *3 106.6254 2.9991 1.74400 44.78 0.5656 4 30.0422 14.4978 5 52.2008 2.2991 1.65160 58.55 0.5427 6 67.6585 6.1233 1.53172 48.84 0.5631 7 198.7908 4.9704 8 139.4689 10.3618 1.80400 46.58 0.5573 9 96.4727 DD [9] 10 299.2196 8.9693 1.51742 52.43 0.5565 11 66.0762 3.9994 1.84661 23.78 0.6207 12 106.4066 0.1491 13 107.8632 2.5000 1.88100 40.14 0.5701 14 48.5554 10.7557 1.49700 81.54 0.5375 15 310.8769 DD [15] 16 11732.3504 6.5205 1.49700 81.54 0.5375 17 67.8512 0.1490 18 193.0989 2.6893 1.43875 94.93 0.5343 19 30544.0697 DD [19] 20 62.4444 3.0001 1.58913 61.14 0.5407 21 43.1799 6.0889 22 176.8246 1.1993 1.68893 31.07 0.6004 23 46.0137 3.3263 24 55.5904 3.6577 1.78470 26.29 0.6136 25 556.6621 DD [25] 26 69.9641 1.1991 1.60300 65.44 0.5402 27 44.5306 2.3725 1.80000 29.84 0.6018 28 106.1842 DD [28] 29 (aperture 1.2990 stop) 30 61.1821 2.9929 1.80100 34.97 0.5864 31 479.0028 0.1492 32 67.4770 19.7929 1.61800 63.33 0.5441 33 30.4084 1.2003 1.90366 31.32 0.5948 34 98.6984 9.2684 35 72.3486 4.3177 1.85002 32.40 0.5986 36 51.8177 2.0606 37 35.2035 6.3115 1.49700 81.54 0.5875 38 31.6712 1.2010 1.88100 40.14 0.5701 39 26.8368 2.0274 40 47.8031 7.3291 1.48749 70.23 0.5301 41 18.9526 1.1991 1.91082 35.25 0.5822 42 8343.9540 0.1502 43 90.6666 7.3503 1.48749 70.23 0.5301 44 23.7246 0.0000 45 2.3000 1.51633 64.14 0.5353 46 29.9940

(49) TABLE-US-00002 TABLE 2 Example 1: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.49 1.95 f 14.203 21.162 27.695 Bf 31.510 31.510 31.510 F No. 2.71 2.71 2.71 2 [] 98.2 72.4 58.0 h 38.470 Yimg 15.75

(50) TABLE-US-00003 TABLE 3 Example 1: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 8.921 8.921 8.921 DD [15] 3.935 3.935 3.935 DD [19] 1.500 29.121 41.635 DD [25] 14.635 3.103 5.194 DD [28] 33.513 17.425 2.819

(51) TABLE-US-00004 TABLE 4 Example 1: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 4.62278307E06 A4 4.86286556E06 A4 6.14778261E06 A6 8.77554561E10 A5 1.92932204E08 A8 1.34711999E11 A6 3.67925408E09 A10 4.96075731E14 A7 3.35087759E11 A12 1.15033129E16 A8 1.57495428E12 A14 1.60626594E19 A9 1.17528821E15 A16 1.22990998E22 A10 4.54994700E16 A18 4.17694414E26 A11 5.04502281E18 A20 2.65204259E30 A12 1.45086775E20 A13 8.02307748E22 A14 4.58656163E23 A15 1.06535667E24 A16 1.09653575E26 A17 2.54537928E28 A18 1.34715266E29 A19 1.70590216E31 A20 8.57519103E33

(52) A through L of FIG. 9 are diagrams that illustrate various aberrations of the zoom lens of Example 1. The spherical aberration, the astigmatic aberration, the distortion, and the lateral chromatic aberration of the zoom lens of Example 1 at the wide angle end are illustrated in A through D of FIG. 9, respectively. The spherical aberration, the astigmatic aberration, the distortion, and the lateral chromatic aberration of the zoom lens of Example 1 at an intermediate focal distance are illustrated in E through H of FIG. 9, respectively. The spherical aberration, the astigmatic aberration, the distortion, and the lateral chromatic aberration of the zoom lens of Example 1 at the telephoto end are illustrated in I through L of FIG. 9, respectively.

(53) The diagrams that illustrate spherical aberration, astigmatic aberration, and distortion show aberrations related to the d line (wavelength: 587.6 nm). The diagrams that illustrate spherical aberration show aberrations related to the d line (wavelength: 587.6 nm), aberrations related to the C line (wavelength: 656.3 nm), and aberrations related to the F line (wavelength: 486.1 nm), as solid lines, broken lines, and dotted lines, respectively. In the diagrams that illustrate astigmatic aberrations, aberrations in the sagittal direction are indicated by solid lines, while aberrations in the tangential direction are indicated by dotted lines. In the diagrams that illustrate lateral chromatic aberration, aberrations related to the C: line (wavelength: 656.3 nm) and aberrations related to the F line (wavelength: 486.1 nm) are shown as broken lines and dotted lines, respectively. In the diagrams that illustrate spherical aberrations, Fno. denotes F values. In the other diagrams that illustrate the aberrations, denotes half angles of view.

(54) Next, a zoom lens according to Example 2 will be described. FIG. 3 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 2.

(55) The zoom lens of Example 2 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a negative refractive power which moves while changing magnification, and a fourth lens group G4 (final lens group) having a positive refractive power which is fixed while changing magnification.

(56) In addition, basic lens data of the zoom lens of Example 2 are shown in Table 5, data related to various items of the zoom lens of Example 2 are shown in Table 6, data related to the distances among movable surfaces of the zoom lens of Example 2 are shown in Table 7, data related to aspherical surface coefficients of the zoom lens of Example 2 are shown in Table 8, and various aberrations of the zoom lens of Example 2 are shown in A through L of FIG. 10.

(57) TABLE-US-00005 TABLE 5 Example 2: Lens Data Ndi g, Fj Si Ri (Re- dj (Partial (Surface (Radius of Di fractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 821.5018 4.5033 1.58313 59.38 0.5435 2 31.5717 17.1046 *3 112.8237 3.0008 1.74400 44.78 0.5656 4 29.3852 14.3024 5 52.2372 2.3299 1.65160 58.55 0.5427 6 61.3517 6.2842 1.53172 48.84 0.5631 7 213.8560 5.1100 8 136.3532 11.2833 1.80400 46.58 0.5573 9 94.7857 DD [9] 10 328.4968 8.8107 1.51742 52.43 0.5565 11 66.0762 4.0007 1.84661 23.78 0.6207 12 106.9894 0.1495 13 108.8604 2.4995 1.88100 40.14 0.5701 14 47.7436 11.0535 1.49700 81.54 0.5375 15 274.5647 DD [15] 16 15632.8276 6.6588 1.49700 81.54 0.5375 17 66.4006 0.1491 18 211.2845 2.4734 1.43875 94.93 0.5343 19 4209.3691 DD [19] 20 61.1845 2.9992 1.58913 61.14 0.5407 21 43.1398 6.6406 22 164.5955 1.1991 1.68893 31.07 0.6004 23 46.0859 3.3263 24 54.8700 3.7000 1.78470 26.29 0.6136 25 534.4627 DD [25] 26 77.3276 1.1991 1.60300 65.44 0.5402 27 46.9962 2.2700 1.80000 29.84 0.6018 28 106.8527 DD [28] 29 (aperture 1.2990 stop) 30 63.5411 2.4660 1.80518 25.42 0.6162 31 443.3579 0.1491 32 48.6249 8.0301 1.56384 60.83 0.5408 33 172.1528 0.4530 34 718.9845 6.5372 1.55332 71.68 0.5403 35 30.8697 1.1991 1.90366 31.32 0.5948 36 97.5055 9.7747 37 107.0521 4.1214 1.85002 32.40 0.5986 38 45.7197 3.0316 39 35.1380 6.3252 1.49700 81.54 0.5375 40 30.5251 1.1991 1.88100 40.14 0.5701 41 26.0385 1.6118 42 35.9154 7.8882 1.48749 70.23 0.5301 43 18.4695 1.1999 1.91082 35.25 0.5822 44 931.2713 1.2785 45 112.2373 7.2528 1.48749 70.23 0.5301 46 23.2427 0.0000 47 2.3000 1.51633 64.14 0.5353 48 30.8700

(58) TABLE-US-00006 TABLE 6 Example 2: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.49 1.95 f 13.801 20.563 26.911 Bf 32.386 32.386 32.386 F No. 2.71 2.71 2.71 2 [] 99.8 74.0 59.4 h 38.550 Yimg 15.75

(59) TABLE-US-00007 TABLE 7 Example 2: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 7.582 7.582 7.582 DD [15] 3.695 3.695 3.695 DD [19] 1.499 29.452 41.907 DD [25] 13.483 2.994 6.258 DD [28] 36.009 18.545 2.826

(60) TABLE-US-00008 TABLE 8 Example 2: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 6.19960130E06 A4 5.32872676E06 A4 7.10169757E06 A6 4.14123998E10 A5 3.94902024E08 A8 1.36128219E11 A6 3.95088610E09 A10 4.94110009E14 A7 3.96583237E11 A12 1.14406960E16 A8 1.69064292E12 A14 1.61231505E19 A9 1.91914204E15 A16 1.23793133E22 A10 4.79410275E16 A18 3.98065907E26 A11 6.04038966E18 A20 6.85445131E31 A12 3.33911800E20 A13 6.15155323E22 A14 4.72501812E23 A15 1.23554996E24 A16 1.65224208E26 A17 1.51203736E28 A18 1.25849261E29 A19 1.85915802E31 A20 5.94365475E33

(61) Next, a zoom lens according to Example 3 will be described. FIG. 4 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 3.

(62) The zoom lens of Example 3 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a positive refractive power which moves while changing magnification, a fourth lens group G4 having a negative refractive power which moves while changing magnification, and a fifth lens group G5 (final lens group) having a positive refractive power which is fixed while changing magnification.

(63) In addition, basic lens data of the zoom lens of Example 3 are shown in Table 9, data related to various items of the zoom lens of Example 3 are shown in Table 10, data related to the distances among movable surfaces of the zoom lens of Example 3 are shown in Table 11, data related to aspherical surface coefficients of the zoom lens of Example 3 are shown in Table 12, and various aberrations of the zoom lens of Example 3 are shown in A through L of FIG. 11.

(64) TABLE-US-00009 TABLE 9 Example 3: Lens Data Ndi g, Fj Si Ri (Re- dj (Partial (Surface (Radius of Di fractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 10000.0000 4.1998 1.58313 59.38 0.5435 2 32.2211 15.8119 *3 74.8507 2.9994 1.72916 54.68 0.5445 4 33.9087 15.9374 5 60.8937 2.0004 1.62230 53.17 0.5542 6 52.2565 7.0614 1.64769 33.79 0.5939 7 268.1345 0.3004 8 80.2515 13.1581 1.51742 52.43 0.5565 9 263.2128 DD [9] 10 400.3201 12.7251 1.51742 52.43 0.5565 11 45.5823 3.0010 1.80518 25.42 0.6162 12 73.2623 0.1509 13 92.2770 2.4002 1.88300 40.80 0.5656 14 47.3282 13.4005 1.49700 81.54 0.5375 15 131.3566 DD [15] 16 440.5038 6.2316 1.49700 81.54 0.5375 17 84.6784 0.1490 18 113.8967 1.8709 1.67790 55.34 0.5473 19 162.6816 DD [19] 20 49.9400 1.9993 1.78472 25.68 0.6162 21 32.6069 5.5028 22 172.4815 1.2010 1.60311 60.64 0.5415 23 37.4416 DD [23] 24 46.7805 3.0176 1.78472 25.68 0.6162 25 148.9296 DD [25] 26 38.6766 1.2008 1.60300 65.44 0.5402 27 53.0088 3.4169 1.80000 29.84 0.6018 28 227.4770 DD [28] 29 (aperture 1.7011 stop) 30 128.5387 2.9391 1.80518 25.43 0.6103 31 102.8542 1.2149 1.80610 33.27 0.5885 32 123.8381 4.0718 33 41.9640 6.9852 1.59282 68.63 0.5441 34 33.8072 1.2008 1.90366 31.32 0.5948 35 118.9395 10.4118 36 230.1445 3.6022 1.84139 24.56 0.6127 37 48.2639 0.2996 38 33.9414 4.9201 1.49700 81.54 0.5375 39 79.9336 1.2007 1.90366 31.32 0.5948 40 28.3339 1.9573 41 47.1420 6.4878 1.56883 56.36 0.5489 42 25.7955 1.2008 1.91082 35.25 0.5822 43 133.4236 0.1509 44 66.4493 4.8070 1.51633 64.14 0.5353 45 42.5558 42.1624 46 2.3000 1.51633 64.14 0.5353 47 6.8700

(65) TABLE-US-00010 TABLE 10 Example 3: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.69 2.40 f 14.502 24.508 34.805 Bf 50.551 50.551 50.551 F No. 2.76 2.76 2.76 2 [] 97.2 64.2 47.6 h 39.752 Yimg 15.75

(66) TABLE-US-00011 TABLE 11 Example 3: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 1.999 1.999 1.999 DD [15] 3.194 3.194 3.194 DD [19] 1.500 30.612 46.067 DD [23] 2.918 3.870 2.748 DD [25] 32.001 9.398 4.944 DD [28] 18.948 11.487 1.607

(67) TABLE-US-00012 TABLE 12 Example 3: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 0.00000000E+00 A4 4.48998467E06 A4 6.99592748E06 A6 1.63755377E09 A5 9.31615918E08 A8 1.65105078E11 A6 1.82380523E09 A10 5.56597762E14 A7 2.16562421E11 A12 1.16319351E16 A8 1.18566591E12 A14 1.53007740E19 A9 9.20263760E16 A16 1.22395091E22 A10 3.67463235E16 A18 5.24386986E26 A11 2.61263836E18 A20 8.75856166E30 A12 8.84168154E22 A13 6.90400529E23 A14 1.72013889E23 A15 5.70263783E25 A16 8.00452042E27 A17 1.97107244E29 A18 1.77994399E30 A19 1.27198496E31 A20 6.59943874E35

(68) Next, a zoom lens according to Example 4 will be described. FIG. 5 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 4.

(69) The zoom lens of Example 4 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a positive refractive power which moves while changing magnification, a fourth lens group G4 having a negative refractive power which moves while changing magnification, and a fifth lens group G5 (final lens group) having a positive refractive power which is fixed while changing magnification.

(70) In addition, basic lens data of the zoom lens of Example 4 are shown in Table 13, data related to various items of the zoom lens of Example 4 are shown in Table 14, data related to the distances among movable surfaces of the zoom lens of Example 4 are shown in Table 15, data related to aspherical surface coefficients of the zoom lens of Example 4 are shown in Table 16, and various aberrations of the zoom lens of Example 4 are shown in A through L of FIG. 12.

(71) TABLE-US-00013 TABLE 13 Example 4: Lens Data Ndi g, Fj Si Ri (Re- dj (Partial (Surface (Radius of Di fractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 10000.0000 4.0006 1.58313 59.38 0.5435 2 32.9933 17.2882 *3 87.0979 3.0002 1.58913 61.14 0.5407 4 33.2350 16.5350 5 58.3333 2.0003 1.58913 61.14 0.5407 6 45.1187 6.9705 1.59551 39.24 0.5804 7 131.6367 1.8871 8 81.5665 11.9999 1.51742 52.43 0.5565 9 160.9692 DD [9] 10 940.4868 12.8191 1.51742 52.43 0.5565 11 42.4380 2.4010 1.80518 25.42 0.6162 12 66.0091 0.1495 13 86.9718 2.9994 1.88300 40.80 0.5656 14 45.5306 12.8459 1.49700 81.54 0.5375 15 157.5820 DD [15] 16 153.1852 7.1314 1.49700 81.54 0.5375 17 88.9356 DD [17] 18 43.2939 2.0008 1.62041 60.29 0.5427 19 29.9643 5.8258 20 194.0683 1.1993 1.62041 60.29 0.5427 21 33.9926 DD [21] 22 39.1631 3.6463 1.60342 38.03 0.5836 23 151.6252 DD [23] 24 44.3515 1.2010 1.60300 65.44 0.5402 25 53.7225 3.1924 1.80000 29.84 0.6018 26 452.7386 DD [26] 27 (aperture 1.3177 stop) 28 87.3983 3.4625 1.80518 25.43 0.6103 29 97.7067 1.2008 1.80610 33.27 0.5885 30 112.2153 0.1498 31 47.7318 6.8015 1.59282 68.63 0.5441 32 33.0684 1.2010 1.90366 31.32 0.5948 33 100.3029 11.8604 34 712.8535 3.5246 1.84139 24.56 0.6127 35 43.7794 0.2990 36 33.0831 5.4367 1.49700 81.54 0.5375 37 58.3870 1.2003 1.90366 31.32 0.5948 38 29.1855 2.3905 39 70.9544 5.7982 1.56883 56.36 0.5489 40 24.3753 1.2004 1.91082 35.25 0.5822 41 250.8216 0.1510 42 63.3138 5.4349 1.51633 64.14 0.5353 43 37.5309 42.1624 44 2.3000 1.51633 64.14 0.5353 45 7.2740

(72) TABLE-US-00014 TABLE 14 Example 4: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.69 2.40 f 14.502 24.509 34.805 Bf 50.954 50.954 50.954 F No. 2.76 2.76 2.76 2 [] 97.0 64.2 47.6 h 40.475 Yimg 15.75

(73) TABLE-US-00015 TABLE 15 Example 4: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 2.001 2.001 2.001 DD [15] 4.351 4.351 4.351 DD [17] 1.648 30.144 45.142 DD [21] 2.708 3.660 2.538 DD [23] 28.703 7.715 4.698 DD [26] 21.115 12.655 1.796

(74) TABLE-US-00016 TABLE 16 Example 4: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 0.00000000E+00 A4 5.29504060E06 A4 6.75059893E06 A6 5.71449059E10 A5 8.28752745E08 A8 1.57517676E11 A6 1.96498556E09 A10 5.54412820E14 A7 2.02284701E11 A12 1.16432393E16 A8 1.18830034E12 A14 1.53241444E19 A9 5.05719925E16 A16 1.22413439E22 A10 3.57264124E16 A18 5.26028411E26 A11 2.39742061E18 A20 8.89038276E30 A12 4.34277976E21 A13 1.09559279E22 A14 1.67422397E23 A15 5.24037655E25 A16 6.31296722E27 A17 2.61711042E29 A18 2.31751638E30 A19 1.27029101E31 A20 1.16955006E33

(75) Next, a zoom lens according to Example 5 will be described. FIG. 6 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 5.

(76) The zoom lens of Example 5 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a positive refractive power which moves while changing magnification, a fourth lens group G4 having a negative refractive power which moves while changing magnification, and a fifth lens group G5 (final lens group) having a positive refractive power which is fixed while changing magnification.

(77) In addition, basic lens data of the zoom lens of Example 5 are shown in Table 17, data related to various items of the zoom lens of Example 5 are shown in Table 18, data related to the distances among movable surfaces of the zoom lens of Example 5 are shown in Table 19, data related to aspherical surface coefficients of the zoom lens of Example 5 are shown in Table 20, and various aberrations of the zoom lens of Example 5 are shown in A through L of FIG. 13.

(78) TABLE-US-00017 TABLE 17 Example 5: Lens Data g, Fj Si Ri Ndi dj (Partial (Surface (Radius of Di (Refractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 9996.1662 3.9990 1.58313 59.38 0.5435 2 33.0268 17.6736 *3 92.7441 3.0004 1.56384 60.67 0.5403 4 32.9830 16.7002 5 57.7257 2.0009 1.56384 60.67 0.5403 6 44.4273 6.9894 1.59551 39.24 0.5804 7 123.4868 2.2107 8 81.8371 11.0878 1.51742 52.43 0.5565 9 175.4565 DD [9] 10 908.4134 12.8193 1.51742 52.43 0.5565 11 42.4326 2.4005 1.80518 25.42 0.6162 12 65.6231 0.1510 13 86.6019 2.4000 1.88300 40.80 0.5656 14 45.0903 12.7416 1.49700 81.54 0.5375 15 168.5297 DD [15] 16 144.0425 7.2491 1.49700 81.54 0.5375 17 89.5821 DD [17] 18 43.5673 2.0001 1.62041 60.29 0.5427 19 29.8335 5.8291 20 200.5387 1.2005 1.62041 60.29 0.5427 21 34.0496 DD [21] 22 39.1990 3.6683 1.60342 38.03 0.5836 23 156.1540 DD [23] 24 43.9071 1.2006 1.60300 65.44 0.5402 25 54.0052 3.1865 1.80000 23.84 0.6018 26 430.7076 DD [26] 27 1.3026 (aperture stop) 28 85.9546 3.4471 1.80518 25.43 0.6103 29 100.1930 1.1997 1.80610 33.27 0.5885 30 110.4660 0.1505 31 48.3759 6.7674 1.53282 68.63 0.5441 32 32.8141 1.1999 1.90366 31.32 0.5948 33 100.3206 11.8554 34 718.3071 3.5385 1.84139 24.56 0.6127 35 43.5209 0.2992 36 33.2408 5.4687 1.49700 81.54 0.5375 37 56.8048 1.2002 1.90366 31.32 0.5948 38 29.1867 2.3596 39 68.8322 6.2059 1.56883 56.36 0.5489 40 24.2121 1.2004 1.91082 35.25 0.5822 41 224.8661 0.1499 42 62.5064 5.5209 1.51633 64.14 0.5353 43 36.7534 42.1624 44 2.3000 1.51633 64.14 0.5353 45 6.7840

(79) TABLE-US-00018 TABLE 18 Example 5: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.69 2.40 f 14.502 24.508 34.805 Bf 50.465 50.465 50.465 F No. 2.76 2.76 2.76 2 [] 97.0 64.2 47.6 h 40.585 Yimg 15.75

(80) TABLE-US-00019 TABLE 19 Example 5: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 2.001 2.001 2.001 DD [15] 4.134 4.134 4.134 DD [17] 1.650 30.084 45.030 DD [21] 2.704 3.656 2.535 DD [23] 28.332 7.585 4.692 DD [26] 21.359 12.719 1.787

(81) TABLE-US-00020 TABLE 20 Example 5: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 0.00000000E+00 A4 5.34557685E06 A4 6.62012404E06 A6 4.77918366E10 A5 8.00989016E08 A8 1.56978908E11 A6 1.97332847E09 A10 5.54192293E14 A7 2.00322887E11 A12 1.16440250E16 A8 1.18543694E12 A14 1.53260905E19 A9 5.62931037E16 A16 1.22421216E22 A10 3.58303992E16 A18 5.25557609E26 A11 2.40915082E18 A20 8.84678479E30 A12 4.42425152E21 A13 1.18549232E22 A14 1.69519099E23 A15 5.26851207E25 A16 6.24066577E27 A17 2.83311374E29 A18 2.36817680E30 A19 1.28243816E31 A20 1.23191223E33

(82) Next, a zoom lens according to Example 6 will be described. FIG. 7 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 6.

(83) The zoom lens of Example 6 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a positive refractive power which moves while changing magnification, a fourth lens group G4 having a negative refractive power which moves while changing magnification, and a fifth lens group G5 (final lens group) having a positive refractive power which is fixed while changing magnification.

(84) In addition, basic lens data of the zoom lens of Example 6 are shown in Table 21, data related to various items of the zoom lens of Example 6 are shown in Table 22, data related to the distances among movable surfaces of the zoom lens of Example 6 are shown in Table 23, data related to aspherical surface coefficients of the zoom lens of Example 6 are shown in Table 24, and various aberrations of the zoom lens of Example 6 are shown in A through L of FIG. 14.

(85) TABLE-US-00021 TABLE 21 Example 6: Lens Data g, Fj Si Ri Ndi dj (Partial (Surface (Radius of Di (Refractive (Abbe's Dispersion No.) Curvature) (Distance) Index) Number) Ratio) *1 833.2049 4.2000 1.58313 59.38 0.5435 2 31.7636 17.9002 *3 127.6910 3.0000 1.72916 54.68 0.5445 4 34.3126 14.6813 5 69.9234 2.0609 1.65100 56.16 0.5482 6 45.5660 9.2669 1.80610 40.92 0.5702 7 578.7597 2.3162 8 93.6917 7.8281 1.51742 52.43 0.5565 9 256.4813 DD [9] 10 11.3461 1.51742 52.43 0.5565 11 44.7600 3.0000 1.80518 25.42 0.6162 12 73.1209 0.1503 13 96.2962 2.4200 1.88300 40.80 0.5656 14 46.8100 12.4094 1.49700 81.54 0.5375 15 180.2152 DD [15] 16 951.6580 6.3106 1.49700 81.54 0.5375 17 77.2853 0.1509 18 163.9945 3.0654 1.51633 64.14 0.5353 19 DD [19] 20 57.6292 2.0006 1.80519 25.40 0.6157 21 37.7564 5.0473 22 146.0915 1.2000 1.62041 60.29 0.5427 23 41.6554 DD [23] 24 54.8186 3.0165 1.78472 25.68 0.6162 25 265.6294 DD [25] 26 43.8649 1.2000 1.60300 65.44 0.5402 27 56.3300 3.0813 1.80000 29.84 0.6018 28 477.8065 DD [28] 29 1.3000 (aperture stop) 30 83.3692 2.1698 1.80518 25.42 0.6162 31 633.2100 2.1715 1.80400 46.58 0.5573 32 187.0891 6.3158 33 36.6370 6.9118 1.61800 63.33 0.5441 34 36.6370 1.2000 1.90366 31.32 0.5948 35 63.4913 12.4536 36 218.6049 3.7518 1.84139 24.56 0.6127 37 45.5768 0.3017 38 31.9703 5.6143 1.49700 81.54 0.5375 39 61.6770 1.2000 1.91082 35.25 0.5822 40 26.9714 1.6352 41 33.2963 7.2686 1.51633 64.14 0.5353 42 26.3200 1.2000 1.91082 35.25 0.5822 43 122.8536 0.2203 44 59.1966 4.9714 1.51633 64.14 0.5353 45 46.6277 37.6430 46 2.3000 1.51633 64.14 0.5353 47 5.7960

(86) TABLE-US-00022 TABLE 22 Example 6: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.69 2.40 f 14.503 24.510 34.808 Bf 44.956 44.956 44.956 F No. 2.75 2.75 2.75 2 [] 97.2 64.2 47.6 h 39.391 Yimg 15.75

(87) TABLE-US-00023 TABLE 23 Example 6: Zoom Distances Wide Angle End Intermediate Telephoto End DD [9] 1.999 1.999 1.999 DD [15] 3.720 3.720 3.720 DD [19] 1.500 31.951 47.943 DD [23] 3.097 3.968 2.812 DD [25] 31.053 8.441 4.417 DD [28] 21.337 12.628 1.816

(88) TABLE-US-00024 TABLE 24 Example 6: Aspherical Surface Coefficients Surface No. 1 Surface No. 3 KA 1.00000000E+00 KA 1.00000000E+00 A3 7.36624463E06 A4 4.10988571E06 A4 6.48233272E06 A6 1.21995779E09 A5 7.39213084E08 A8 1.59589857E11 A6 1.96775959E09 A10 5.49266080E14 A7 1.87763145E11 A12 1.16559890E16 A8 1.19443930E12 A14 1.54783593E19 A9 1.64603963E16 A16 1.23414774E22 A10 3.50236069E16 A18 5.23355121E26 A11 2.53695199E18 A20 8.61685265E30 A12 4.38860761E21 A13 1.40947481E22 A14 1.29050477E23 A15 5.05727148E25 A16 8.41600054E27 A17 1.65092551E28 A18 8.29887329E31 A19 8.12713794E32 A20 1.81223806E33

(89) Next, a zoom lens according to Example 7 will be described. FIG. 8 is a collection of sectional diagrams that illustrate the lens configuration of the zoom lens of Example 7.

(90) The zoom lens of Example 7 is constituted by a first lens group G1 having a positive refractive power which is fixed while changing magnification, a second lens group G2 having a negative refractive power which moves while changing magnification, a third lens group G3 having a positive refractive power which moves while changing magnification, a fourth lens group G4 having a negative refractive power which moves while changing magnification, and a fifth lens group G5 (final lens group) having a positive refractive power which is fixed while changing magnification.

(91) In addition, basic lens data of the zoom lens of Example 7 are shown in Table 25, data related to various items of the zoom lens of Example 7 are shown in Table 26, data related to the distances among movable surfaces of the zoom lens of Example 7 are shown in Table 27, data related to aspherical surface coefficients of the zoom lens of Example 7 are shown in Table 28, and various aberrations of the zoom lens of Example 7 are shown in A through L of FIG. 15.

(92) TABLE-US-00025 TABLE 25 Example 7: Lens Data Ri Ndi g, Fj Si (Radius of Di (Refractive (Abbe's (Surface No.) Curvature) (Distance) Index) Number) *1 474.1079 4.0745 1.88000 36.02 2 38.1537 15.3232 *3 57.6675 3.0000 1.88000 40.00 4 32.3563 15.9448 5 111.1467 1.2000 1.88300 40.76 6 140.5909 1.2000 1.88300 40.76 7 101.7368 8.0019 8 77.3379 1.2000 1.43500 82.06 9 615.4996 6.6907 10 301.7285 9.6136 1.87999 34.48 11 83.3740 1.1964 12 87.3406 15.9509 1.43956 87.94 13 86.3341 2.9828 14 69.4525 1.7988 1.88000 24.68 15 82.1391 1.5524 16 205.8050 6.9859 1.88001 33.30 17 47.9172 14.8863 1.43501 86.05 18 188.9332 5.4496 19 275.6761 11.0517 1.56570 69.89 20 76.4781 0.3443 21 123.8611 2.7878 1.44152 89.00 22 240.6510 DD [22] *23 67.8102 1.2534 1.88000 40.00 24 31.7225 4.2411 25 484.3459 1.2000 1.68126 57.44 26 63.9111 DD [26] 27 56.2453 2.3229 1.79506 25.25 28 158.3898 DD [28] 29 47.7543 1.2000 1.56867 65.78 30 64.6989 2.9294 1.88000 28.37 31 552.2441 DD [31] 32 (aperture 0.2993 stop) 33 459.5820 2.4215 1.43501 89.63 34 127.7905 0.2970 35 90.0800 2.8112 1.74142 27.93 36 14886.6570 7.8174 37 95.5653 10.1929 1.55514 71.35 38 39.6539 1.6944 1.85632 34.30 39 251.4526 19.7231 40 90.7134 4.4685 1.46016 62.61 41 50.6603 8.2083 42 44.6260 6.1506 1.63441 34.69 43 26.8777 1.1999 1.87980 25.58 44 26.3581 1.0758 45 39.0893 7.7742 1.52585 50.15 46 21.5664 1.2000 1.87768 40.23 47 470.8190 3.6661 48 70.5057 8.5184 1.46393 85.55 49 28.0438 0.0000 50 3.7000 1.51633 64.14 51 29.5110

(93) TABLE-US-00026 TABLE 26 Example 7: Items (related to d line) Wide Angle End Intermediate Telephoto End Zoom Ratio 1.00 1.50 2.40 f 10.348 15.522 24.834 Bf 31.950 31.950 31.950 F No. 2.67 2.67 2.67 2 [] 115.8 89.4 63.4 h 45.011 Yimg 15.75

(94) TABLE-US-00027 TABLE 27 Example 7: Zoom Distances Wide Angle End Intermediate Telephoto End DD [22] 1.500 24.832 46.278 DD [26] 7.494 8.700 6.716 DD [28] 31.917 11.571 4.959 DD [31] 18.568 14.375 1.526

(95) TABLE-US-00028 TABLE 28 Example 7: Aspherical Surface Coefficients Surface No. 1 3 23 KA 1.00000000E+00 1.00000000E+00 1.00000000E+00 A3 0.00000000E+00 0.00000000E+00 0.00000000E+00 A4 5.18882505E06 5.14249825E06 5.25532447E07 A5 0.00000000E+00 0.00000000E+00 0.00000000E+00 A6 3.23450934E09 5.12834157E11 8.34301502E10 A7 0.00000000E+00 0.00000000E+00 0.00000000E+00 A8 1.98740330E12 1.14153099E12 4.93172362E12 A9 0.00000000E+00 0.00000000E+00 0.00000000E+00 A10 6.83584428E16 3.42331893E16 1.06735795E14 A11 0.00000000E+00 0.00000000E+00 0.00000000E+00 A12 1.14552162E19 1.12891019E21 7.89012953E18 A13 0.00000000E+00 0.00000000E+00 0.00000000E+00 A14 0.00000000E+00 0.00000000E+00 0.00000000E+00 A15 0.00000000E+00 0.00000000E+00 0.00000000E+00 A16 0.00000000E+00 0.00000000E+00 0.00000000E+00 A17 0.00000000E+00 0.00000000E+00 0.00000000E+00 A18 0.00000000E+00 0.00000000E+00 0.00000000E+00 A19 0.00000000E+00 0.00000000E+00 0.00000000E+00 A20 0.00000000E+00 0.00000000E+00 0.00000000E+00

(96) In addition, Table 29 shows values corresponding to Conditional Formulae (1) through (4) for Examples 1 through 7. Note that all of the Examples use the d line as a reference wavelength, and the values shown in Table 29 are those with respect to the reference wavelength.

(97) TABLE-US-00029 TABLE 29 Conditional Formula Formula Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 (1) h/(Yimg tan) 2.12 2.06 2.23 2.27 2.28 2.21 1.79 (2) n1a 1.663 1.663 1.620 1.575 1.565 1.657 1.807 (3) f13/f1 2.59 2.66 2.64 2.78 2.73 2.28 2.85 (4) f11/Yimg 1.89 1.85 1.68 1.68 1.69 1.84 1.79

(98) Based on the data above, all of the zoom lenses of Examples 1 through 6 satisfy Conditional Formulae (1) through (4), and the zoom lens of Example 7 satisfies Conditional Formulae (1), (3), and (4). Therefore, it can be understood that these zoom lenses are high performance zoom lenses having wide angles of view, while being compact and lightweight.

(99) Next, an imaging apparatus according to an embodiment of the present invention will be described. FIG. 16 is a schematic diagram that illustrates the configuration of an imaging apparatus equipped with a zoom lens according to an embodiment of the present invention as an example of an imaging apparatus according to the embodiment of the present invention. Note that FIG. 16 schematically illustrates each of the lens groups. Examples of this imaging apparatus include a video camera and an electronic still camera having a solid state imaging element such as a CCD and a CMOS as a recording medium.

(100) The imaging apparatus 10 illustrated in FIG. 16 is equipped with an imaging lens 1, a filter 6 that functions as a low pass filter or the like, provided toward the image side of the imaging lens 1, an imaging element 7 provided toward the image side of the filter 6, and a signal processing circuit 8. The imaging element 7 converts optical images formed by the imaging lens 1 into electrical signals. A CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) may be employed as the imaging element 7, for example. The imaging element 7 is provided such that the imaging surface thereof is positioned at the image formation plane of the imaging lens 1.

(101) Images obtained by the imaging lens 1 are formed on the imaging surface of the imaging element 7. Output signals from the imaging element 7 related to the images undergo calculation processes at the signal processing circuit 8, and the images are displayed by a display device 9.

(102) The present invention has been described in connection with the embodiments and the Examples. However, the zoom lens of the present invention is not limited to the embodiments and Examples described above, and various modifications are possible. For example, the values of the radii of curvature, the distances among surfaces, and the refractive indices, etc., of each lens component are not limited to the numerical values indicated in connection with the Examples, and may be other values.