Zoom lens, lens barrel, and imaging device

Abstract

To provide a zoom lens, a lens barrel, and an imaging apparatus that can reduce a variation in aberration associated with a change in photographic distance.SOLUTION: A zoom lens has a positive first lens group, a negative second lens group, and a rear group, and in magnification variation from a wide end to a telephoto end, the interval between the adjacent lens groups is changed. The rear group has at least one negative lens group and one positive lens group. Of the negative lens groups included in the rear group, the lens group having the largest negative refractive power is a focusing lens group GF that moves to an image side during focusing from infinity to a close range. Of the positive lens groups included in the rear group, the positive lens group GFF arranged adjacent to an object side of the focusing lens group GF has a positive lens component L1 located on the most image side. The positive lens component L1 has a positive lens L1P, and satisfies the following conditional expression (1). (1) 1.85<NdL1 P, wherein NdL1P is the refractive index of the positive lens L1P.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens, a lens barrel, and an imaging device.

Background Art

[0002] Conventionally, various types of zoom lenses for digital cameras are known. In particular, as a zoom lens with an extended telephoto focal length, generally, a positive-lead zoom type that follows, in order from the object side, a positive, a negative, and a rear group is used, and it is required to be a small-sized zoom lens having high optical performance in the entire zoom and shooting distance range. Further, in order to realize a high-speed autofocus operation, an inner focus method of moving a lens group inside rather than a front lens having a large weight for weight reduction of a focusing lens group is known. In particular, a rear focus method that uses a lens group close to the image plane, which is easy to reduce the lens outer diameter and is lightweight, has been frequently used in recent years.

[0003] However, in the conventional rear focus method, there is a problem that the change in field curvature is large at the short focal length end side, and the change in spherical aberration and coma aberration is large at the long focal length end side, so that the image quality deteriorates according to the change in shooting distance. In particular, a lens for the purpose of high-speed AF is often configured with a small number of lenses in order to further reduce the weight of the focusing lens group. Naturally, the smaller the number of lenses, the more difficult it is to suppress aberration fluctuations according to the shooting distance. In addition, there is also a method of using a low-specific gravity optical material for weight reduction of the focusing lens. However, generally, since many low-specific gravity optical materials have a low refractive index, the effect of suppressing aberration fluctuations becomes weak.

[0004] In Patent Document 1, for the purpose of reducing the weight of the focusing lens, a five-group zoom lens configuration composed of, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power, and a fifth lens group with negative refractive power, or a six-group zoom lens configuration composed of, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power, a fifth lens group with negative refractive power, and a sixth lens group with negative refractive power is disclosed. This zoom lens moves the fifth lens group with negative refractive power toward the image side during focusing (the fifth lens group constitutes the focusing lens).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the zoom lens of Patent Document 1 has room for improvement in terms of suppressing aberration variation accompanying changes in the shooting distance (for example, suppressing changes in field curvature at the short focal length end and suppressing changes in spherical aberration and coma aberration at the long focal length end).

[0007] The present invention has been made in view of the above points, and an object thereof is to provide a zoom lens, a lens barrel, and an imaging device capable of suppressing aberration variation accompanying changes in the shooting distance.

Means for Solving the Problems

[0008] The zoom lens according to this embodiment has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group. When zooming from the wide-angle end to the telephoto end, the interval between adjacent lens groups changes. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power. Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. The rear group has at least one lens group located on the image side of the focusing lens group GF. Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power that is arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side. The positive lens component L1 has a positive lens L1P, and has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1. The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. The focusing lens group GF has at least one negative lens and at least one positive lens, and satisfies the following conditional expressions (1’), (2), and (8A) 、(13A) which is characterized by the following (1’) 1.87 < NdL1P (2) 25 < νdL1P (8A) 0.1 < TLT / fT ≦ 0.90 (13A) - 4 < fGFP / fGFN < -0.5 However NdL1P: refractive index of the positive lens L1P νdL1P: Abbe number of the positive lens L1P TLT: overall lens length at infinity focus at the telephoto end fT: focal length of the entire system at infinity focus at the telephoto end 、 fGFP: Focal length of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF fGFN: Focal length of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF That is

[0009] In another aspect, the zoom lens according to the present embodiment has, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power. Among the lens groups with a negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. It has at least one lens group located on the image side of the focusing lens group GF. Among them, the lens group with the positive refractive power arranged closest to the object side is the lens group GFRP that moves toward the object side during focusing from infinity to a short distance. The positive lens included in the lens group GFRP is only one, and it satisfies the following conditional expressions (24) and (25). Note that "the positive lens included in the lens group GFRP is only one" includes the case where the lens group GFRP is composed of only one positive lens, as well as the case where it has one or more negative lenses in addition to one positive lens. (24) 35 < νdRP < 100 (25) 1.55 < NdRP However, νdRP: Abbe number of the positive lens included in (constituting) the lens group GFRP NdRP: Refractive index of the positive lens included in (constituting) the lens group GFRP is.

[0010] In another aspect, the zoom lens according to the present embodiment has, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power. Among the lens groups with a negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. Among the lens groups with a positive refractive power included in the rear group, the lens group GFF with a positive refractive power disposed adjacent to the object side of the focusing lens group GF is composed of, in order from the object side, a positive lens L4P, a positive lens L3P, a negative lens L3N, a negative lens L2N, a positive lens L2P, and a positive lens L1P. The negative lenses L2N and L3N satisfy the following conditional expressions (27) and (28), respectively. This is the gist of the invention. (27) 1.91 < NdL2N (28) 1.91 < NdL3N However, NdL2N: The refractive index of the negative lens L2N, NdL3N: The refractive index of the negative lens L3N, is as follows.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a zoom lens, a lens barrel, and an imaging device that can suppress aberration fluctuations associated with changes in the shooting distance.

Brief Description of the Drawings

[0012]

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Mode for Carrying Out the Invention

[0013] First, definitions of terms used in this specification are provided. The "lens component" in this specification means a lens having only two refracting surfaces in contact with air in the normal optical path, i.e., the object side surface and the image side surface. For example, a single lens or a cemented lens corresponds to the "lens component". "Vibration prevention" in this specification means preventing image blur caused by lens shake during shooting, and the "vibration prevention lens" in this specification means a lens that is driven to prevent image blur caused by lens shake during shooting.

[0014] FIG. 1 is a diagram showing the movement locus of the zoom lens of Numerical Example 1 and the configurations of the vibration prevention lens group and the focus lens group.

[0015] The zoom lens of Numerical Example 1 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, and a fifth lens group G5 with positive refractive power. The third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the light amount that moves integrally with the third lens group G3 is provided. Between the fifth lens group G5 and the image plane, a parallel plate CG is provided. The parallel plate CG combines functions such as a low-pass filter, an infrared cut filter, and a cover glass of the imaging element.

[0016] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move (extend) toward the object side with respect to the image plane, and the second lens group G2 is fixed with respect to the image plane. By moving the third lens group G3 and the fifth lens group G5 along the same locus, the mechanical structure is simplified. In this way, the magnification is achieved by changing the intervals between adjacent lens groups.

[0017] The fourth lens group G4 is the lens group with the strongest negative refractive power in the rear group, and constitutes the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. The focusing lens group GF has one positive lens GFP and one negative lens GFN (it may have other lenses). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF.

[0018] The third lens group G3 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the fourth lens group G4) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has the positive lens component L1 located most on the image side and the positive lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of the positive lens L1P. The positive lens component L2 is composed of a cemented lens of the negative lens L2N and the positive lens L2P.

[0019] On the object side of the negative lens L2N, in order from the image side, the negative lens L3N, the positive lens L3P, and the positive lens L4P are arranged, and the negative lens L3N and the positive lens L3P are cemented. Therefore, the lens group GFF can have a configuration of the positive lens L4P, the positive lens L3P, the negative lens L3N, the negative lens L2N, the positive lens L2P, and the positive lens L1P in order from the object side. By adopting such a configuration in which the lenses are arranged symmetrically, aberration correction can be performed more effectively during zooming and when the shooting distance changes.

[0020] A part of the second lens group G2 (here, the first and second lenses out of six lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0021] FIG. 2 is a diagram showing the movement locus of the zoom lens of Numerical Example 2 and the configurations of the anti-shake lens group and the focus lens group.

[0022] The zoom lens of Numerical Example 2 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, and a sixth lens group G6 with positive refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. A parallel plate CG is provided between the sixth lens group G6 and the image plane.

[0023] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move (extend) toward the object side with respect to the image plane, and the second lens group G2 is fixed with respect to the image plane. By moving the fourth lens group G4 and the sixth lens group G6 along the same trajectory, the mechanical structure is simplified. In this way, the magnification is achieved by changing the intervals between adjacent lens groups.

[0024] The fifth lens group G5 is the lens group with the strongest negative refractive power in the rear group and constitutes a focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. The focusing lens group GF has one positive lens GFP and one negative lens GFN (it may have other lenses). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF.

[0025] The fourth lens group G4 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the fifth lens group G5) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has a positive lens component L1 located closest to the image side and a positive lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of a positive lens L1P. The positive lens component L2 is composed of a cemented lens of a negative lens L2N and a positive lens L2P.

[0026] A part of the second lens group G2 (here, the fourth to sixth lenses out of six lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0027] FIG. 3 is a diagram showing the movement locus of the zoom lens of Numerical Example 3 and the configurations of the anti-shake lens group and the focus lens group.

[0028] The zoom lens of Numerical Example 3 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, a fifth lens group G5 with positive refractive power, a sixth lens group G6 with negative refractive power, and a seventh lens group G7 with positive refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 constitute the "rear group". A diaphragm SP for adjusting the light amount that moves independently of each lens group is provided between the third lens group G3 and the fourth lens group G4. A parallel plate CG is provided between the seventh lens group G7 and the image plane.

[0029] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the sixth lens group G6, and the diaphragm SP move (extend) toward the object side with respect to the image plane, the fourth lens group G4 moves toward the image side with respect to the image plane, and the second lens group G2, the fifth lens group G5, and the seventh lens group G7 are fixed with respect to the image plane. In this way, the magnification is performed by changing the intervals between adjacent lens groups.

[0030] The sixth lens group G6 is the lens group with the strongest negative refractive power in the rear group, and constitutes the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. Also, the fourth lens group constitutes a focusing lens group that moves toward the object side during focusing from infinity to a short distance. By adopting such a double focusing method, aberration correction can be performed more effectively when the shooting distance changes. The focusing lens group GF (the sixth lens group G6) has one positive lens GFP and one negative lens GFN (and also has one negative lens). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF.

[0031] The fifth lens group G5 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the sixth lens group G6) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has the positive lens component L1 located most on the image side and the negative lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of the positive lens L1P. The positive lens component L2 is composed of a cemented lens of the positive lens L2P and the negative lens L2N.

[0032] A part of the second lens group G2 (here, the third to fifth lenses among the five lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0033] FIG. 4 is a diagram showing the movement locus of the zoom lens of Numerical Example 4 and the configurations of the anti-shake lens group and the focus lens group.

[0034] The zoom lens of Numerical Example 4 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, a fifth lens group G5 with positive refractive power, a sixth lens group G6 with negative refractive power, a seventh lens group G7 with positive refractive power, and an eighth lens group G8 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the eighth lens group G8 and the image plane, a parallel plate CG is provided.

[0035] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 move (extend) toward the object side with respect to the image plane, and the second lens group G2 is fixed with respect to the image plane. By moving the third lens group G3 and the fifth lens group G5 along the same trajectory, the mechanical structure is simplified. In this way, the magnification is achieved by changing the intervals between adjacent lens groups.

[0036] The sixth lens group G6 is the lens group with the strongest negative refractive power in the rear group and constitutes a focusing lens group GF that moves toward the image side when focusing from infinity to a short distance. Also, the fourth lens group constitutes a focusing lens group that moves toward the object side when focusing from infinity to a short distance. By adopting such a double focus method, aberration correction can be performed more effectively when the shooting distance changes. The focusing lens group GF (the sixth lens group G6) has a cemented lens of one positive lens GFP and one negative lens GFN (it may have other lenses). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF.

[0037] The fifth lens group G5 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the sixth lens group G6) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has a positive lens component L1 located closest to the image side and a negative lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of a cemented lens of a negative lens L1N and a positive lens L1P. The positive lens component L2 is composed of a cemented lens of a positive lens L2P and a negative lens L2N.

[0038] A part of the second lens group G2 (here, the third to fifth lenses out of five lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0039] FIG. 5 is a diagram showing the movement locus of the zoom lens of Numerical Example 5, the configuration of the anti-shake lens group, and the focus lens group.

[0040] The zoom lens of Numerical Example 5 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, a fifth lens group G5 with positive refractive power, a sixth lens group G6 with negative refractive power, a seventh lens group G7 with positive refractive power, and an eighth lens group G8 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the light amount that moves integrally with the third lens group G3 is provided. Between the eighth lens group G8 and the image plane, a parallel plane plate CG is provided.

[0041] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 move (extend) toward the object side with respect to the image plane, and the second lens group G2 is fixed with respect to the image plane. By moving the third lens group G3 and the fifth lens group G5 along the same locus, the mechanical structure is simplified. In this way, the magnification is changed by varying the intervals between adjacent lens groups.

[0042] The sixth lens group G6 is the lens group with the strongest negative refractive power in the rear group and constitutes the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. Also, the fourth lens group constitutes a focusing lens group that moves toward the object side during focusing from infinity to a short distance. By adopting such a double focus method, aberration correction can be performed more effectively when the shooting distance changes. The focusing lens group GF (the sixth lens group G6) has a cemented lens of one positive lens GFP and one negative lens GFN (and also has one positive lens). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF.

[0043] The fifth lens group G5 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the sixth lens group G6) among the lens groups with positive refractive power included in the rear group. The positive refractive power lens group GFF has the positive lens component L1 located most on the image side and the negative lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of the positive lens L1P. The positive lens component L2 is composed of a cemented lens of the positive lens L2P and the negative lens L2N.

[0044] A part of the second lens group G2 (here, the third to fifth lenses among the five lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0045] FIG. 6 is a diagram showing the movement locus of the zoom lens, the configuration of the anti-vibration lens group, and the focus lens group in Numerical Example 6.

[0046] The zoom lens in Numerical Example 6 is composed of, in order from the object side, a first lens group G1 with a positive refractive power, a second lens group G2 with a negative refractive power, a third lens group G3 with a positive refractive power, a fourth lens group G4 with a positive refractive power, a fifth lens group G5 with a negative refractive power, and a sixth lens group G6 with a negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 constitute the "rear group". Between the third lens group G3 and the fourth lens group G4 (immediately after the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the sixth lens group G6 and the image plane, a parallel plate CG is provided.

[0047] When zooming from the short focal length end to the long focal length end, the first lens group G1, the third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 move (extend) toward the object side with respect to the image plane, and the second lens group G2 is fixed with respect to the image plane. By moving the fourth lens group G4 and the sixth lens group G6 along the same locus, simplification of the mechanical configuration is achieved. In this way, the magnification is performed by changing the interval between adjacent lens groups.

[0048] The fifth lens group G5 is the lens group with the strongest negative refractive power in the rear group, and constitutes a focusing lens group GF that moves toward the image side when focusing from infinity to the near distance. The focusing lens group GF has a cemented lens of one negative lens GFN and one positive lens GFP (and also has one negative lens in addition). The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF. The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF.

[0049] The fourth lens group G4 constitutes a positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the fifth lens group G5) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has a positive lens component L1 located closest to the image side and a positive lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of a positive lens L1P. The positive lens component L2 is composed of a cemented lens of a positive lens L2P and a negative lens L2N.

[0050] A part of the second lens group G2 (here, the second and third lenses out of seven lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0051] FIG. 7 is a diagram showing the movement locus of the zoom lens of Numerical Example 7, the configuration of the anti-shake lens group, and the focus lens group.

[0052] The zoom lens of Numerical Example 7 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, a sixth lens group G6 with positive refractive power, and a seventh lens group G7 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 constitute the "rear group". Between the second and third lenses of the fourth lens group G4, a diaphragm SP for adjusting the amount of light that moves integrally with the fourth lens group G4 is provided. Between the seventh lens group G7 and the image plane, a parallel plate CG is provided.

[0053] When zooming from the short focal length end to the long focal length end, the third lens group G3 and the sixth lens group G6 move (extend) toward the object side with respect to the image plane, the second lens group G2 moves toward the image side with respect to the image plane, the fifth lens group G5 and the sixth lens group G6 move so that the distance between adjacent lens groups changes, and the first lens group G1, the fourth lens group G4, and the seventh lens group G7 are fixed with respect to the image plane. In this way, zooming is performed by changing the distance between adjacent lens groups.

[0054] The fifth lens group G5 is the lens group with the strongest negative refractive power in the rear group and constitutes the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. The sixth lens group G6 is the lens group with the positive refractive power that is arranged closest to the object side among the lens groups located on the image side with respect to the focusing lens group GF, and constitutes the focusing lens group GFRP that moves toward the object side during focusing from infinity to a short distance. By adopting such a double focus method, aberration correction can be performed more effectively when the shooting distance changes. The focusing lens group GF (the fifth lens group G5) has a cemented lens of one positive lens GFP and one negative lens GFN (it may have other lenses). The positive lens GFP can be the positive lens with the smallest Abbe number among the positive lenses included in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses included in the focusing lens group GF. The focusing lens group GFRP (the sixth lens group G6) is composed of one positive lens (positive lens 61G described later).

[0055] The fourth lens group G4 constitutes the positive refractive power lens group GFF that is arranged adjacent to the object side of the focusing lens group GF (the fifth lens group G5) among the positive refractive power lens groups included in the rear group. The positive refractive power lens group GFF has the positive lens component L1 located closest to the image side and the positive lens component L2 located adjacent to the object side of the positive lens component L1. The positive lens component L1 is composed of the positive lens L1P. The positive lens component L2 is composed of a cemented lens of the negative lens L2N and the positive lens L2P.

[0056] A part of the fourth lens group G4 (here, the fourth to sixth lenses out of six lenses) is an anti-shake lens group that enables image blur by moving in a direction perpendicular to the optical axis during image blur correction.

[0057] As a result of intensive research, the inventor of the present invention has found that, in order to effectively suppress aberration variations according to the shooting distance, not only the selection of the lens material of the focusing lens group itself and the configuration of the lens group (in addition to this), but also the selection of the lens material of the lens group adjacent to the focusing lens group and the configuration of the lens group are important, and thus completed the present invention.

[0058] Generally, low refractive index lens materials are mostly low dispersion materials, which are effective for chromatic aberration correction, but due to their low refractive index, they are disadvantageous for correcting spherical aberration and field curvature.

[0059] In the present embodiment, the lens group with the strongest negative refractive power in the rear group is used as the focusing lens group GF, and a lens group GFF with a positive refractive power is arranged on the object side of the focusing lens group GF. By using a high refractive index material for the positive lens L1P of the positive lens component L1 located on the most image side of this positive refractive power lens group GFF, the effect of aberration correction due to changes in the shooting distance is improved.

[0060] In particular, the most image side of the positive refractive power lens group GFF is the position closest to the focusing lens group GF and having a large axial pupil diameter. Therefore, it is preferable to use the positive lens L1P of the high refractive index material at this position. Incidentally, in the zoom lens of Patent Document 1 described above, all the positive lenses used in the fourth lens group arranged adjacent to the object side of the fifth lens group, which is the focusing lens group, have relatively low refractive indices.

[0061] Summarizing the above, the zoom lens of the present embodiment has, in order from the object side, a first lens group G1 with a positive refractive power, a second lens group G2 with a negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power. Among the lens groups with a negative refractive power included in the rear group, the lens group with the strongest negative refractive power is defined as a focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. Among the lens groups with a positive refractive power included in the rear group, a lens group GFF with a positive refractive power arranged adjacent to the object side of the focusing lens group GF has a positive lens component L1 located most on the image side, and the positive lens component L1 has a positive lens L1P.

[0062] Based on the above lens configuration, the zoom lens of the present embodiment preferably satisfies the following conditional expression (1), and more preferably satisfies the following conditional expressions (1’), (1”), and (1’’’). (1) 1.85 < NdL1P (1’) 1.87 < NdL1P (1”) 1.88 < NdL1P (1’’’) 1.9 < NdL1P However, NdL1P: Refractive index of the positive lens L1P is.

[0063] By satisfying the conditional expression (1), spherical aberration, coma aberration, astigmatism, etc. can be corrected well. Also, the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end when the shooting distance changes can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expressions (1’), (1”), and (1’’’). When exceeding the lower limit of the conditional expression (1), it becomes difficult to correct spherical aberration, coma aberration, astigmatism, etc. In particular, the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end when the shooting distance changes deteriorate.

[0064] The zoom lens of this embodiment preferably satisfies the following conditional expression (2), and more preferably satisfies the following conditional expressions (2') and (2"). (2) 25 < νdL1P (2’) 27 < νdL1P (2”) 29 < νdL1P However,[ νdL1P: Abbe number of the positive lens L1P is.

[0065] By satisfying the conditional expression (2), axial chromatic aberration variation due to zooming or focusing can be suppressed. This effect can be obtained more remarkably by satisfying the conditional expressions (2') and (2"). When the lower limit of the conditional expression (2) is exceeded, the axial chromatic aberration variation due to zooming or focusing becomes large.

[0066] The zoom lens of this embodiment preferably satisfies the following conditional expression (3), and more preferably satisfies the following conditional expression (3'). (3) -5 < fGFF / fGF < -0.7 (3’) -3 < fGFF / fGF < -0.7 However,[ fGFF: Focal length of the lens group GFF with positive refractive power fGF: Focal length of the in-focus lens group GF is.

[0067] By satisfying the conditional expression (3), high-speed AF can be realized by suppressing the focus movement amount of the in-focus lens group GF. Also, the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end when the shooting distance changes can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expression (3'). If it exceeds the upper limit of conditional expressions (3) and (3’), the refractive power of the focusing lens group GF becomes too weak, the focus movement amount becomes large, and it becomes difficult to realize high-speed AF. In addition, the refractive power of the positive refractive power lens group GFF becomes too strong, and the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end when the shooting distance changes deteriorate. If it exceeds the lower limit of conditional expression (3), the refractive power of the focusing lens group GF becomes too strong, and the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end when the shooting distance changes deteriorate.

[0068] The zoom lens of the present embodiment has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, and the lens component L2 is composed of a cemented lens of a negative lens L2N and a positive lens L2P. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (4), and it is more preferable that it satisfies the following conditional expression (4’). (4) 1.0 < NdL2N / NdL2P < 1.6 (4’) 1.05 < NdL2N / NdL2P < 1.4 However, NdL2N: refractive index of the negative lens L2N, NdL2P: refractive index of the positive lens L2P, is.

[0069] By satisfying conditional expression (4), spherical aberration can be appropriately corrected. This effect can be obtained more remarkably by satisfying conditional expression (4’). If it exceeds the upper limit of conditional expression (4), the refractive index of the negative lens L2N becomes too high compared to the refractive index of the positive lens L2P, and spherical aberration becomes overcorrected. If it exceeds the lower limit of conditional expression (4), the refractive index of the negative lens L2N becomes too low compared to the refractive index of the positive lens L2P, and spherical aberration becomes undercorrected.

[0070] The zoom lens of this embodiment has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, and the lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (5), and it is more preferable that it satisfies the following conditional expression (5’). (5) 0.2 < νdL2N / νdL2P < 0.7 (5’) 0.2 < νdL2N / νdL2P < 0.5 However, νdL2P: Abbe number of the positive lens L2P, νdL2N: Abbe number of the negative lens L2N, is.

[0071] By satisfying the conditional expression (5), chromatic aberration can be appropriately corrected. This effect can be obtained more remarkably by satisfying the conditional expression (5’). When exceeding the upper limit of the conditional expression (5), the difference in Abbe number between the positive lens L2P and the negative lens L2N becomes too small, resulting in insufficient correction of chromatic aberration. When exceeding the lower limit of the conditional expressions (5) and (5’), the difference in Abbe number between the positive lens L2P and the negative lens L2N becomes too large, resulting in overcorrection of chromatic aberration.

[0072] It is preferable that the zoom lens of this embodiment satisfies the following conditional expression (6), and it is more preferable that it satisfies the following conditional expression (6’). (6) 0.5 < fL1 / fGFF < 5 (6’) 1 < fL1 / fGFF < 3 However, fL1: Focal length of the positive lens component L1, fGFF: Focal length of the lens group GFF with positive refractive power, is.

[0073] By satisfying the conditional expression (6), it is possible to satisfactorily correct the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end when the shooting distance changes. This effect can be obtained more remarkably by satisfying the conditional expression (6’). If it exceeds the upper limit of conditional expression (6), the refractive power of the positive lens component L1 becomes too weak, and the aberration generated in the focusing lens group GF becomes insufficiently corrected. As a result, the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end deteriorate when the shooting distance changes. If it exceeds the lower limit of conditional expression (6), the refractive power of the positive lens component L1 becomes too strong, and the aberration generated in the focusing lens group GF becomes overcorrected. As a result, the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end deteriorate when the shooting distance changes.

[0074] The zoom lens of this embodiment preferably satisfies the following conditional expression (7), and more preferably satisfies the following conditional expression (7’). (7) 0.5 < |fL2| / fL1 < 20 (7’) 0.6 < |fL2| / fL1 < 10 However, fL1: The focal length of the positive lens component L1, fL2: The focal length of the lens component L2, wherein.

[0075] By satisfying conditional expression (7), spherical aberration, coma aberration, field curvature, and chromatic aberration when the shooting distance changes can be corrected well. This effect can be obtained more remarkably by satisfying conditional expression (7’). If it exceeds the upper limit of conditional expression (7), the refractive power of the positive lens component L1 becomes too strong, and the spherical aberration, coma aberration, and field curvature when the shooting distance changes fluctuate (deteriorate). If it exceeds the lower limit of conditional expression (7), the refractive power of the lens component L2 becomes too strong, and the spherical aberration, coma aberration, and chromatic aberration when the shooting distance changes fluctuate (deteriorate).

[0076] The zoom lens of this embodiment preferably satisfies the following conditional expression (8), and more preferably satisfies the following conditional expression (8’). (8) 0.1 < TLT / fT < 0.95 (8’) 0.3 < TLT / fT < 0.92 However, TLT: The overall lens length at infinity focus at the long focal length end, fT: The focal length of the entire system at infinity focus at the long focal length end, is as follows.

[0077] By satisfying conditional expression (8), miniaturization of the entire lens system can be achieved, and spherical aberration and coma aberration, mainly at the long focal length end, can be corrected well. This effect can be obtained more remarkably by satisfying conditional expression (8’). If the upper limit of conditional expression (8) is exceeded, the entire lens system will become larger in size. If the lower limit of conditional expression (8) is exceeded, spherical aberration and coma aberration, mainly at the long focal length end, will deteriorate.

[0078] The zoom lens of this embodiment preferably satisfies the following conditional expression (9), and more preferably satisfies the following conditional expression (9’). (9) 0.1 < f1 / fT < 1 (9’) 0.3 < f1 / fT < 0.7 However, f1: The focal length of the first lens group G1, fT: The focal length of the entire system at infinity focus at the long focal length end, is as follows.

[0079] By satisfying conditional expression (9), miniaturization of the entire lens system can be achieved, and spherical aberration and coma aberration, mainly at the long focal length end, can be corrected well. This effect can be obtained more remarkably by satisfying conditional expression (9’). If the upper limit of conditional expression (9) is exceeded, the entire lens system will become larger in size. If the lower limit of conditional expression (9) is exceeded, spherical aberration and coma aberration, mainly at the long focal length end, will deteriorate.

[0080] The zoom lens of this embodiment preferably satisfies the following conditional expression (10), and more preferably satisfies the following conditional expression (10’). (10) 0.3 < f2 / fGF < 3.0 (10’) 0.4 < f2 / fGF < 2.5 However, f2: Focal length of the second lens group G2 fGF: Focal length of the in-focus lens group GF is satisfied.

[0081] By satisfying the conditional expression (10), it is possible to suppress aberration fluctuations due to changes in the shooting distance and aberration fluctuations during zooming. In particular, it is possible to satisfactorily correct spherical aberration and coma aberration at the long focal length end and astigmatism at the short focal length end. This operational effect can be obtained more remarkably by satisfying the conditional expression (10’). When the upper limit of the conditional expression (10) is exceeded, the refractive power of the in-focus lens group GF with respect to the second lens group G2 becomes too strong, and the aberration fluctuation due to the change in the shooting distance becomes large. In particular, it becomes difficult to correct spherical aberration and coma aberration at the long focal length end. When the lower limit of the conditional expression (10) is exceeded, the refractive power of the second lens group G2 with respect to the in-focus lens group GF becomes too strong, and the aberration fluctuation during zooming becomes large. In particular, it becomes difficult to correct astigmatism at the short focal length end and spherical aberration at the long focal length end.

[0082] The zoom lens of the present embodiment preferably satisfies the following conditional expression (11), and more preferably satisfies the following conditional expression (11’). (11) -8 < f1 / f2 < -2 (11’) -7 < f1 / f2 < -2.7 However, f1: Focal length of the first lens group G1 f2: Focal length of the second lens group G2 is satisfied.

[0083] By satisfying the conditional expression (11), it is possible to suppress aberration fluctuations during zooming and satisfactorily correct spherical aberration and coma aberration at the long focal length end. In addition, it is possible to reduce the size of the entire lens system. This operational effect can be obtained more remarkably by satisfying the conditional expression (11’). When exceeding the upper limit of conditional expression (11), the refractive power of the first lens group G1 becomes too strong with respect to the second lens group G2, making it difficult to correct spherical aberration and coma aberration at the long focal length end. When exceeding the lower limit of conditional expression (11), the refractive power of the second lens group G2 becomes too strong with respect to the first lens group G1, increasing the aberration variation during zooming. Also, the entire lens system becomes larger.

[0084] In the zoom lens of the present embodiment, when zooming from the short focal length end to the long focal length end, the position of the first lens group G1 or the second lens group G2 in the optical axis direction is fixed. If the first lens group G1 and the second lens group G2 move during zooming, it will cause decentering errors, mainly resulting in factors such as coma aberration at the long focal length end. By setting the first lens group G1 or the second lens group G2 as a fixed group during zooming, decentering errors can be suppressed, and mainly coma aberration at the long focal length end can be corrected well.

[0085] The zoom lens of the present embodiment has a focusing lens group GF having at least one negative lens. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (12), and more preferably satisfies the following conditional expression (12’). (12) 35 < νdGFN (12’) 37 < νdGFN However, νdGFN: The Abbe number of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF is.

[0086] By satisfying conditional expression (12), axial chromatic aberration variation due to zooming or focusing can be suppressed. This effect can be obtained more significantly by satisfying conditional expression (12’). When exceeding the lower limit of conditional expression (12), axial chromatic aberration variation due to zooming or focusing becomes large.

[0087] The zoom lens of this embodiment has a focusing lens group GF having at least one negative lens and at least one positive lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (13), and it is more preferable that it satisfies the following conditional expression (13'). (13) -10 < fGFP / fGFN < -0.5 (13’) -4 < fGFP / fGFN < -0.6 However, fGFP: The focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: The focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF, is as follows.

[0088] By satisfying the conditional expression (13), it is possible to satisfactorily correct the field curvature at the wide-angle end and the spherical aberration, coma aberration, and chromatic aberration at the telephoto end when the shooting distance changes. In addition, the focusing movement amount of the focusing lens group GF can be reduced to achieve high-speed AF. This effect can be obtained more remarkably by satisfying the conditional expression (13'). When exceeding the upper limit of the conditional expression (13), the refractive power of the negative lens GFN becomes too weak, the focusing movement amount of the focusing lens group GF becomes large, and high-speed AF becomes difficult. In addition, the refractive power of the positive lens GFP becomes too strong, and the field curvature at the wide-angle end and the spherical aberration, coma aberration at the telephoto end when the shooting distance changes deteriorate. When exceeding the lower limit of the conditional expression (13), the refractive power of the negative lens GFN becomes too strong, and the field curvature at the wide-angle end and the spherical aberration, coma aberration, and chromatic aberration at the telephoto end when the shooting distance changes deteriorate.

[0089] The zoom lens of this embodiment has a focusing lens group GF having at least one negative lens and at least one positive lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (14), and it is more preferable that it satisfies the following conditional expression (14'). (14) 0.2 < νdGFP / νdGFN < 0.7 (14’) 0.3 < νdGFP / νdGFN < 0.6 However, νdGFP: The Abbe number of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF. νdGFN: The Abbe number of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF. is.

[0090] By satisfying the conditional expression (14), chromatic aberration can be appropriately corrected. This effect can be obtained more significantly by satisfying the conditional expression (14’). When exceeding the upper limit of the conditional expression (14), the difference in Abbe number between the positive lens GFP and the negative lens GFN becomes too small, resulting in insufficient correction of chromatic aberration. When exceeding the lower limit of the conditional expression (14), the difference in Abbe number between the positive lens GFP and the negative lens GFN becomes too large, resulting in overcorrection of chromatic aberration.

[0091] The zoom lens of this embodiment has at least one lens group located on the image side with respect to the focusing lens group GF. Since the entrance pupil diameter becomes smaller on the image side with respect to the focusing lens group GF, it is less affected by spherical aberration and coma aberration. Therefore, the lens group on the image side with respect to the focusing lens group GF can be specialized for correcting field curvature and longitudinal chromatic aberration.

[0092] The zoom lens of this embodiment has at least one lens group located on the image side with respect to the focusing lens group GF. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (15), and more preferably satisfies the following conditional expression (15’). (15) 0.1 < DGFRT / TLT < 0.5 (15’) 0.1 < DGFRT / TLT < 0.4 However, TLT: The overall length of the lens at infinity focus at the telephoto end. DGFRT: The distance on the optical axis from the most image-side refracting surface of the lens group GFF with positive refractive power at infinity focus at the long focal length end to the most object-side refracting surface of the lens group on the image side of the focusing lens group GF. It is.

[0093] By satisfying the conditional expression (15), it is possible to suppress aberration fluctuations due to changes in the shooting distance. In particular, it is possible to favorably correct the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end. Also, by reducing the focusing movement amount of the focusing lens group GF, high-speed AF can be realized. This operational effect can be obtained more remarkably by satisfying the conditional expression (15’). When exceeding the upper limit of the conditional expression (15), the overall lens length at the long focal length end becomes too large. If an attempt is made to unreasonably reduce the overall lens length, the refractive power of the focusing lens group GF has to be increased, resulting in a large aberration fluctuation due to a change in the shooting distance. In particular, it becomes difficult to correct the field curvature at the short focal length end and the spherical aberration and coma aberration at the long focal length end. When exceeding the lower limit of the conditional expressions (15) and (15’), the focusing movement amount of the focusing lens group GF becomes too large, making it difficult to realize high-speed AF.

[0094] The zoom lens of this embodiment has at least one lens group located on the image side of the focusing lens group GF. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (16), and it is more preferable to satisfy the following conditional expression (16’). (16) |fGFRT| / fGF < -1.5 (16’) -1000 < |fGFRT| / fGF < -2 However, fGFRT: The combined focal length of the lens group on the image side of the focusing lens group GF at infinity focus at the long focal length end. fGF: The focal length of the focusing lens group GF. It is.

[0095] By satisfying conditional expression (16), it is possible to satisfactorily correct the aberration variation due to the change in the shooting distance. In particular, it is possible to satisfactorily correct the spherical aberration and the coma aberration at the telephoto end. This operational effect can be obtained more remarkably by satisfying conditional expression (16’). Furthermore, by satisfying conditional expression (16’), it is possible to satisfactorily correct the aberration variation during zooming or when the shooting distance changes. In particular, it is possible to satisfactorily correct the coma aberration and the field curvature which are off-axis aberrations. When exceeding the upper limit of conditional expression (16), the refractive power of the lens group on the image side from the focusing lens group GF becomes too strong, and the aberration variation during zooming or when the shooting distance changes becomes large. In particular, it becomes difficult to correct the coma aberration and the field curvature which are off-axis aberrations. When exceeding the lower limit of conditional expression (16’), the refractive power of the focusing lens group GF becomes too strong, and the aberration variation due to the change in the shooting distance becomes large. In particular, it becomes difficult to correct the spherical aberration and the coma aberration at the telephoto end.

[0096] In the zoom lens of the present embodiment, when zooming from the wide-angle end to the telephoto end, it is preferable that the interval between the focusing lens group GF and the front and rear lens groups adjacent to the focusing lens group GF changes. The focusing lens group GF also serves as a compensator during zooming. Since the pupil diameter of the focusing lens group GF is small, the influence on the spherical aberration is small, and the field curvature variation during zooming can be effectively suppressed.

[0097] The zoom lens of the present embodiment preferably satisfies the following conditional expression (17), and more preferably satisfies the following conditional expression (17’). (17) 3.0 < |(1 - M_GFT 2 ) × M_GFRT 2 | (17’) 3.5 < |(1 - M_GFT 2 ) × M_GFRT 2 | However, M_GFT: The lateral magnification of the focusing lens group GF at infinity focus at the telephoto end, M_GFRT: The combined lateral magnification of all lens groups arranged on the image side from the focusing lens group GF at infinity focus at the long focal length end (when the focusing lens group GF is the most on the image side, M_GFRT = 1), is as follows.

[0098] The conditional expressions (17) and (17’) define the focusing sensitivity of the focusing lens group GF. By satisfying the conditional expression (17), the maximum shooting magnification can be ensured, the focusing movement amount of the focusing lens group GF can be suppressed to enable high-speed AF, and the miniaturization of the entire lens system can be achieved. This operational effect can be obtained more remarkably by satisfying the conditional expression (17’). If it exceeds the lower limit of the conditional expression (17), the focusing sensitivity of the focusing lens group GF becomes too weak, the shortest shooting distance becomes long, and the maximum shooting magnification decreases. Alternatively, the focusing movement amount of the focusing lens group GF increases, the AF speed becomes slow, and the overall lens length becomes large.

[0099] The first lens group G1 preferably includes one negative lens and two positive lenses. At the long focal length end side (telephoto side), aberrations are enlarged, especially spherical aberration, coma aberration, and chromatic aberration increase. For the positive lenses in the first lens group G1, a low refractive index and low dispersion material is used for chromatic aberration correction. In this case, with only one positive lens, spherical aberration and coma aberration increase, making it difficult to extend the focal length at the long focal length end side (telephoto side). Therefore, it is preferable that the first lens group G1 includes at least two positive lenses. Also, in order to cancel out the aberrations generated by the positive lenses, it is necessary to provide at least one negative lens in the first lens group G1.

[0100] The zoom lens of this embodiment has the first lens group G1 having at least one negative lens. In this case, the zoom lens of this embodiment preferably satisfies the following conditional expression (18), and more preferably satisfies the following conditional expression (18’). (18) -10 < f1 / fN < -0.7 (18’) -3.3 < f1 / fN < -0.8 However, f1: Focal length of the first lens group G1, fN: Focal length of the negative lens having the strongest refractive power among the negative lenses included in the first lens group G1, which is as follows.

[0101] By satisfying the conditional expression (18), spherical aberration, coma aberration, astigmatism, and chromatic aberration can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expression (18’). When exceeding the upper limit of the conditional expression (18), the power of the negative lens having the strongest refractive power among the negative lenses included in the first lens group G1 becomes too weak, making it difficult to correct spherical aberration, coma aberration, and chromatic aberration. When exceeding the lower limit of the conditional expression (18), the power of the negative lens having the strongest refractive power among the negative lenses included in the first lens group G1 becomes too strong, making it difficult to correct spherical aberration, coma aberration, astigmatism, and chromatic aberration over the entire zoom range.

[0102] The zoom lens of the present embodiment preferably satisfies the following conditional expression (19), and more preferably satisfies the following conditional expression (19’). (19) 0.3 < f1 / (fw × ft) 1 / 2 < 3 (19’) 0.7 < f1 / (fw × ft) 1 / 2 < 1.5 However, f1: Focal length of the first lens group G1, fw: Focal length of the entire system at infinity focus at the short focal length end, ft: Focal length of the entire system at infinity focus at the long focal length end, which is as follows.

[0103] By satisfying the conditional expression (19), a desired magnification ratio can be ensured and the size of the entire lens system can be reduced. Also, especially on the long focal length end side (telephoto side), spherical aberration, coma aberration, astigmatism, axial chromatic aberration, magnification chromatic aberration, etc. can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expression (19’). When exceeding the upper limit of conditional expression (19), the refractive power of the first lens group G1 becomes too weak, resulting in a reduction in the zoom ratio or an increase in the overall size of the entire lens system. When exceeding the lower limit of conditional expression (19), the refractive power of the first lens group G1 becomes too strong, making it difficult to correct spherical aberration, coma aberration, astigmatism, axial chromatic aberration, magnification chromatic aberration, etc., particularly at the long focal length end (telephoto side).

[0104] The zoom lens of this embodiment preferably satisfies the following conditional expression (20). (20) 0.1 < (D12T - D12W) / f1 < 10 However, f1: The focal length of the first lens group G1, D12T: The distance on the optical axis from the most image-side refracting surface of the first lens group G1 to the most object-side refracting surface of the second lens group G2 when focused at infinity at the long focal length end, D12W: The distance on the optical axis from the most image-side refracting surface of the first lens group G1 to the most object-side refracting surface of the second lens group G2 when focused at infinity at the short focal length end, is.

[0105] By satisfying conditional expression (20), it is possible to reduce the overall size of the entire lens system while ensuring a sufficient zoom ratio. Also, various aberration variations during zooming can be corrected well. When exceeding the upper limit of conditional expression (20), the amount of change in the interval between the first lens group G1 and the second lens group G2 during zooming becomes too large, resulting in an excessive expansion of the interval between the first lens group G1 and the second lens group G2 at the long focal length end (telephoto side), and thus the overall size of the entire lens system increases. When exceeding the lower limit of conditional expression (20), the amount of change in the interval between the first lens group G1 and the second lens group G2 during zooming becomes too small, resulting in a decrease (or inability to ensure) in the zoom ratio. Also, if one tries to obtain the desired zoom ratio forcefully, the refractive power of the first lens group G1 or the second lens group G2 has to be increased, leading to an increase in various aberration variations during zooming.

[0106] The zoom lens of the present embodiment preferably satisfies the following conditional expression (21). (21) -10 < (D2RW - D2RT) / f2 < -0.1 However, f2: Focal length of the second lens group G2 D2RW: Distance on the optical axis from the most image-side refracting surface of the second lens group G2 to the most object-side refracting surface of the rear group when focused at infinity at the short focal length end D2RT: Distance on the optical axis from the most image-side refracting surface of the second lens group G2 to the most object-side refracting surface of the rear group when focused at infinity at the long focal length end is as follows.

[0107] By satisfying the conditional expression (21), it is possible to reduce the size of the entire lens system while ensuring a sufficient zoom ratio. In addition, various aberration variations during zooming can be corrected favorably. If the upper limit of the conditional expression (21) is exceeded, the distance between the second lens group G2 and the rear group becomes too large on the short focal length end (wide angle side), and the entire lens system becomes large-sized. If the lower limit of the conditional expression (21) is exceeded, the amount of change in the distance between the second lens group G2 and the rear group during zooming becomes too small, and the zoom ratio becomes small (or cannot be ensured). Also, if an attempt is made to obtain a desired zoom ratio forcibly, the refractive power of the second lens group G2 or the rear group (third lens group G3) must be increased, and various aberration variations during zooming become large.

[0108] The zoom lens of the present embodiment preferably satisfies the following conditional expression (22), and more preferably satisfies the following conditional expression (22’). (22) 0.3 < (ft / fw) / (M2T / M2W) < 2 (22’) 0.5 < (ft / fw) / (M2T / M2W) < 1.7 ft: Focal length of the entire system when focused at infinity at the long focal length end fw: Focal length of the entire system when focused at infinity at the short focal length end M2T: Lateral magnification of the second lens group G2 when focused at infinity at the long focal length end M2W: Lateral magnification of the second lens group G2 at infinity focus at the short focal length end, is as follows.

[0109] The conditional expressions (22) and (22’) define the zooming burden borne by the second lens group G2. By satisfying the conditional expression (22), it is possible to satisfactorily correct spherical aberration, coma aberration, astigmatism variation, etc. during zooming while obtaining a desired zoom ratio. This effect can be obtained more remarkably by satisfying the conditional expression (22’). When exceeding the upper limit of the conditional expression (22), the zooming burden of the second lens group G2 decreases, and it is necessary to increase the refractive power of other lens groups in order to obtain a desired zoom ratio. For this reason, it becomes difficult to correct spherical aberration, coma aberration, astigmatism variation, etc. during zooming. When exceeding the lower limit of the conditional expression (22), the zooming burden of the second lens group G2 increases, and it becomes difficult to correct spherical aberration, coma aberration, astigmatism variation, etc. during zooming.

[0110] In the zoom lens of the present embodiment, image blur generated in a captured image due to camera shake or the like can be corrected by having an anti-shake lens group. When camera shake of the same angle occurs, the image blur becomes larger as the focal length is longer. Therefore, for a lens with a longer focal length on the long focal length end side (telephoto side), it is desirable that the image blur can be corrected more. However, when the anti-shake lens group unit becomes larger, it affects the enlargement of the lens. Also, when the weight of the anti-shake lens group itself becomes heavier, in order to drive the heavy anti-shake lens group, a small and lightweight configuration of the anti-shake lens group is desired.

[0111] Further, it is preferable that the vibration-proof lens group is included in a lens group (the second lens group G2 or the fourth lens group G4 in the example of the present embodiment) whose position in the optical axis direction is fixed during zooming. Generally, for the vibration-proof lens group, a drive mechanism (including mechanical members, magnets, coils, electrical components, etc., hereinafter referred to as "vibration-proof drive mechanism") for moving the lens in a direction substantially perpendicular to the optical axis is arranged on the outer periphery of the lens to be driven. When the vibration-proof lens group is configured to move during zooming, a zoom movement mechanism and a lens barrel are further required in the outer peripheral direction, and the outer diameter direction of the lens becomes large. However, by fixing the lens group including the vibration-proof lens group during zooming as in the zoom lens of the present embodiment, it is possible to prevent the enlargement of the zoom movement mechanism and the lens barrel in the outer peripheral direction.

[0112] The zoom lens system of the present embodiment has a vibration-proof lens group on the object side of the focusing lens group GF. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (23), and more preferably satisfies the following conditional expression (23'). (23) 0.9 < |(1 - M_VT) × M_VRT| < 4.5 (23') 1.7 < |(1 - M_VT) × M_VRT| < 4.2 However, M_VT: Lateral magnification of the vibration-proof lens group at infinity focus at the long focal length end, M_VRT: Composite lateral magnification of all lens groups on the image side of the vibration-proof lens group at infinity focus at the long focal length end, is.

[0113] By satisfying the conditional expression (23), it is possible to obtain a desired anti-vibration effect while favorably correcting decentering aberration during anti-vibration driving. In addition, the vibration-proof lens group and thus the vibration-proof drive unit can be downsized. This effect can be obtained more remarkably by satisfying the conditional expression (23'). When the upper limit of the conditional expression (23) is exceeded, the refractive power of the vibration-proof lens group becomes too strong, and the decentering aberration during anti-vibration driving increases. When the lower limit of conditional expression (23) is exceeded, the anti-vibration sensitivity of the anti-vibration lens group becomes too weak to obtain a desired anti-vibration effect. Alternatively, the anti-vibration lens group and thus the anti-vibration drive unit become large-sized.

[0114] The zoom lens of the present embodiment, in another aspect (for example, Numerical Example 7 described later), has, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, and the rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power. Among the lens groups with a negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. The rear group has at least one lens group located on the image side of the focusing lens group GF, and among them, the lens group with the positive refractive power arranged closest to the object side is the lens group GFRP that moves toward the object side during focusing from infinity to a short distance. There is only one positive lens included in the lens group GFRP, and it can satisfy the following conditional expression (24) and conditional expression (25). (24) 35 < νdRP < 100 (25) 1.55 < NdRP However, νdRP: The Abbe number of the positive lens(es) included in (constituting) the lens group GFRP, NdRP: The refractive index of the positive lens(es) included in (constituting) the lens group GFRP, is.

[0115] In addition, in this specification, "there is only one positive lens included in the lens group GFRP" includes not only the case where the lens group GFRP is composed of only one positive lens, but also the case where there are one or more negative lenses in addition to one positive lens.

[0116] In other words, the zoom lens of the present embodiment has at least one lens group located on the image side with respect to the focusing lens group GF. Among them, the lens group having a positive refractive power and arranged closest to the object side is the lens group GFRP that moves toward the object side during focusing from infinity to a short distance. There is only one positive lens included in the lens group GFRP. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (24), and it is more preferable that it satisfies the following conditional expression (24’). (24) 35 < νdRP < 100 (24’) 50 < νdRP < 68 However, νdRP: Abbe number of the positive lens included in (constituting) the lens group GFRP is.

[0117] The zoom lens of the present embodiment can have a lens group GFRP that further moves in addition to the focusing lens group GF during focusing. By adopting such a double focusing method, it is possible to more effectively correct aberrations when the shooting distance changes. In particular, the lens group GFRP having a positive refractive power and arranged adjacent to the image side with respect to the focusing lens group GF has a relatively small outer diameter and is lightweight, can perform high-speed AF operation, and can be configured with a relatively small number of lenses. Furthermore, by satisfying the conditional expression (24), it is possible to suppress axial chromatic aberration and magnification chromatic aberration fluctuations due to zooming and focusing. This effect can be obtained more remarkably by satisfying the conditional expression (24’). When exceeding the upper limit of the conditional expression (24), axial chromatic aberration and magnification chromatic aberration fluctuations due to zooming and focusing will be overcorrected. When exceeding the lower limit of the conditional expression (24), axial chromatic aberration and magnification chromatic aberration fluctuations due to zooming and focusing will become large.

[0118] Further, the zoom lens of the present embodiment has at least one lens group located on the image side with respect to the focusing lens group GF. Among them, the lens group having a positive refractive power and arranged closest to the object side is the lens group GFRP that moves toward the object side during focusing from infinity to a short distance. There is only one positive lens included in the lens group GFRP. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (25), and it is more preferable to satisfy the following conditional expression (25’). (25) 1.55 < NdRP (25’) 1.59 < NdRP However, νdRP: The refractive index of the positive lens included in (constituting) the lens group GFRP is as follows.

[0119] By satisfying the conditional expression (25), spherical aberration, coma aberration, astigmatism, etc. can be corrected well. Also, the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end when the shooting distance changes can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expression (25’). When exceeding the lower limit of the conditional expression (25), it becomes difficult to correct spherical aberration, coma aberration, astigmatism, etc. In particular, the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end when the shooting distance changes deteriorate.

[0120] Further, the zoom lens of the present embodiment has at least one lens group located on the image side with respect to the focusing lens group GF. Among them, the lens group having a positive refractive power and arranged closest to the object side is the lens group GFRP that moves toward the object side during focusing from infinity to a short distance. There is only one positive lens included in the lens group GFRP. In this case, it is preferable that the zoom lens of the present embodiment satisfies the following conditional expression (26), and it is more preferable to satisfy the following conditional expression (26’). (26) 0.2 < |fGF / fGFRP| < 2.5 (26’) 0.4 < |fGF / fGFRP| < 1.2 However, fGF: Focal length of the focusing lens group GF fGFRP: Focal length of the lens group GFRP is as follows.

[0121] By satisfying the conditional expression (26), it is possible to satisfactorily correct spherical aberration, coma aberration, astigmatism, etc. Also, it is possible to satisfactorily correct the field curvature at the wide-angle end and the spherical aberration and coma aberration at the telephoto end when the shooting distance changes. This operational effect can be obtained more remarkably by satisfying the conditional expression (26’). If the upper limit of the conditional expression (26) is exceeded, the refractive power of the lens group GFRP becomes too strong, making it difficult to correct spherical aberration, coma aberration, astigmatism, etc. In particular, the spherical aberration and coma aberration at the telephoto end when the shooting distance changes deteriorate. If the lower limit of the conditional expression (26) is exceeded, the refractive power of the lens group GFRP becomes too weak, making it difficult to correct spherical aberration, coma aberration, astigmatism, etc. In particular, the field curvature at the wide-angle end when the shooting distance changes deteriorates.

[0122] In another aspect (for example, Numerical Example 1 described later) of the zoom lens according to the present embodiment, it has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group. When zooming from the wide-angle end to the telephoto end, the interval between adjacent lens groups changes. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power. Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side when focusing from infinity to a short distance. Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF is composed of, in order from the object side, a positive lens L4P, a positive lens L3P, a negative lens L3N, a negative lens L2N, a positive lens L2P, and a positive lens L1P. The negative lenses L2N and L3N can satisfy the following conditional expressions (27) and (28), respectively. (27) 1.91 < NdL2N (28) 1.91 < NdL3N However, NdL2N: Refractive index of negative lens L2N, NdL3N: Refractive index of negative lens L3N, is the case.

[0123] As described above, in the zoom lens of the present embodiment, among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF can be configured as a positive lens L4P, a positive lens L3P, a negative lens L3N, a negative lens L2N, a positive lens L2P, and a positive lens L1P in order from the object side. By adopting such a configuration in which the lenses are arranged symmetrically, aberration correction can be performed more effectively when zooming or changing the shooting distance. In particular, it is effective for off-axis aberrations such as coma aberration and astigmatism. In addition, since the distance between the negative lens L3N and the negative lens L2N is fixed during zooming, aberrations caused by decentration during zooming can be suppressed.

[0124] The zoom lens of the present embodiment preferably satisfies the following conditional expressions (27) and (28) on the premise of the above lens configuration, and more preferably satisfies the following conditional expressions (27’), (27”), (28’), and (28”). (27) 1.91 < NdL2N (27’) 1.95 < NdL2N (27”) 2.00 < NdL2N (28) 1.91 < NdL3N (28’) 1.95 < NdL3N (28”) 2.00 < NdL3N However, NdL2N: Refractive index of negative lens L2N, NdL3N: Refractive index of negative lens L3N, is the case.

[0125] By satisfying the conditional expression (27), spherical aberration, coma aberration, etc. over the entire zoom range can be corrected well. In addition, fluctuations in spherical aberration and coma aberration when the shooting distance changes can be corrected well. This effect can be obtained more remarkably by satisfying the conditional expressions (27’) and (27”). When exceeding the lower limit of conditional expression (27), it becomes difficult to correct spherical aberration, coma aberration, etc. across the entire zoom range. Also, spherical aberration and coma aberration when the shooting distance changes deteriorate.

[0126] By satisfying conditional expression (28), it is possible to satisfactorily correct spherical aberration, coma aberration, etc. across the entire zoom range. Also, it is possible to satisfactorily correct fluctuations in spherical aberration and coma aberration when the shooting distance changes. This operational effect can be obtained more remarkably by satisfying conditional expressions (28’) and (28”). When exceeding the lower limit of conditional expression (28), it becomes difficult to correct spherical aberration, coma aberration, etc. across the entire zoom range. Also, spherical aberration and coma aberration when the shooting distance changes deteriorate.

[0127] In the zoom lens of the present embodiment, for the lens group GFF, on the premise of the configuration of a positive lens L4P, a positive lens L3P, a negative lens L3N, a negative lens L2N, a positive lens L2P, and a positive lens L1P in order from the object side, it is preferable to satisfy the following conditional expression (29), and it is more preferable to satisfy the following conditional expressions (29’) and (29”). (29) 0.2 < D23N < DGFF < 0.8 (29’) 0.3 < D23N < DGFF < 0.7 (29”) 0.35 < D23N < DGFF < 0.65 However, D23N: The distance on the optical axis from the image side surface of the negative lens L3N to the object side surface of the negative lens L2N, DGFF: The distance on the optical axis from the most object side refracting surface to the most image side refracting surface of the lens group GFF, is as follows.

[0128] By satisfying conditional expression (29), it is possible to shorten the overall lens length and satisfactorily correct coma aberration across the entire zoom range. If it exceeds the upper limit of conditional expression (29), the thickness of the lens group GFF in the optical axis direction becomes too large, and the overall lens length increases. For this reason, the lens diameter must be increased to increase the peripheral light quantity of off-axis light. As a result, it becomes difficult to correct coma aberration. If it exceeds the lower limit of conditional expression (29), it becomes difficult to correct coma aberration throughout the zoom range.

[0129] In the zoom lens of the present embodiment, the lens group GFF preferably satisfies the following conditional expression (30) on the premise of the configuration of a positive lens L4P, a positive lens L3P, a negative lens L3N, a negative lens L2N, a positive lens L2P, and a positive lens L1P in this order from the object side, and more preferably satisfies the following conditional expressions (30') and (30"). (30) 0.7 < fGFFA < fGFFB < 1.5 (30’) 0.75 < fGFFA < fGFFB < 1.3 (30”) 0.8 < fGFFA < fGFFB < 1.2 However, fGFFA: The combined focal length of the positive lens L4P, the positive lens L3P, and the negative lens L3N, fGFFB: The combined focal length of the negative lens L2N, the positive lens L2P, and the positive lens L1P, is.

[0130] By satisfying conditional expression (30), it is possible to satisfactorily correct spherical aberration, coma aberration, astigmatism, etc. throughout the zoom range. If it exceeds the upper limit of conditional expression (30), the symmetry of the refractive power of the lens group GFF is broken, and it becomes difficult to correct spherical aberration, coma aberration, astigmatism, etc. If it exceeds the lower limit of conditional expression (30), the symmetry of the refractive power of the lens group GFF is broken, and again, it becomes difficult to correct spherical aberration, coma aberration, astigmatism, etc.

[0131] Specific numerical examples 1-7 are shown. In the longitudinal aberration diagram, lateral aberration diagram, and the table, d-line, g-line, and C-line represent aberrations for their respective wavelengths, S is sagittal, M is meridional, FNO. is the F-number, f is the focal length, W is the semi-field angle, Y is the image height, BF is the back focus, L is the overall lens length, R is the radius of curvature, D is the lens thickness or lens interval, N(d) is the refractive index for the d-line, and ν(d) is the Abbe number for the d-line. The back focus is the distance from the most image-side surface of the entire lens system to the designed image plane. The overall lens length and back focus indicate the value of the air-equivalent length without including a cover glass, etc. between the most image-side surface of the entire lens system and the designed image plane. The F-number, focal length, magnification, semi-field angle, image height, back focus, overall lens length, and the lens interval D whose interval changes with zooming and focusing are shown in the order of short focal length end - intermediate focal length - long focal length end. The unit of length is [mm]. The rotationally symmetric aspherical surface is defined by the following equation. x = cy2 / [1 + [1 - (1 + K)c2y2]1 / 2] + A4y4 + A6y6 + A8y8 + A10y10 + A12y12 ··· (where c is the curvature (1 / r), y is the height from the optical axis, K is the conic coefficient, A4, A6, A8, ····· are the aspherical coefficients of each order)

[0132] [Numerical Example 1] Figures 8 to 16 and Tables 1 to 3 show the zoom lens of Numerical Example 1. Figure 8 is a diagram showing the lens configuration at the short focal length end when focused at infinity. Figures 9 and 10 are longitudinal aberration diagrams at the short focal length end and long focal length end when focused at infinity. Figures 11 and 12 are lateral aberration diagrams at the short focal length end and long focal length end when focused at infinity. Figures 13 and 14 are longitudinal aberration diagrams when focused with an object-image distance of 0.9 m at the short focal length end and long focal length end. Figures 15 and 16 are lateral aberration diagrams when focused with an object-image distance of 0.9 m at the short focal length end and long focal length end. Table 1 is surface data, Table 2 is various data, and Table 3 is zoom lens group data.

[0133] The zoom lens of Numerical Example 1 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power (lens group GFF with positive refractive power), a fourth lens group G4 with negative refractive power (focusing lens group GF), and a fifth lens group G5 with positive refractive power. The third lens group G3, the fourth lens group G4, and the fifth lens group G5 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately in front of the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the fifth lens group G5 and the image plane, a parallel plane plate CG is provided.

[0134] The first lens group G1 is composed of, in order from the object side, a positive meniscus lens 11A convex on the object side, a negative meniscus lens 12A convex on the object side, and a positive meniscus lens 13A convex on the object side. The negative meniscus lens 12A and the positive meniscus lens 13A are joined together.

[0135] The second lens group G2 is composed of, in order from the object side, a biconcave negative lens 21A, a positive meniscus lens 22A convex on the object side, a biconvex positive lens 23A, a negative meniscus lens 24A convex on the object side, a positive meniscus lens 25A convex on the object side, and a negative meniscus lens 26A convex on the image side. The negative meniscus lens 24A and the positive meniscus lens 25A are joined together.

[0136] The third lens group G3 is composed of, in order from the object side, a biconvex positive lens 31A, a biconvex positive lens 32A, a negative meniscus lens 33A convex on the image side, a negative meniscus lens 34A (negative lens L2N) convex on the object side, a biconvex positive lens 35A (positive lens L2P), and a biconvex positive lens 36A (positive lens L1P). The biconvex positive lens 32A and the negative meniscus lens 33A are joined together. The negative meniscus lens 34A (negative lens L2N) and the biconvex positive lens 35A (positive lens L2P) are joined together and constitute the positive lens component L2. The biconvex positive lens 36A (positive lens L1P) constitutes the positive lens component L1.

[0137] The fourth lens group G4 is composed of, in order from the object side, a positive meniscus lens 41A (positive lens GFP) convex toward the image side and a biconcave negative lens 42A (negative lens GFN).

[0138] The fifth lens group G5 is composed of, in order from the object side, a negative meniscus lens 51A convex toward the image side, a biconvex positive lens 52A, and a negative meniscus lens 53A convex toward the image side. The biconvex positive lens 52A and the negative meniscus lens 53A are joined together.

[0139] (Table 1) [Surface data] Zoom ratio 4.04 Surface number R D N(d) ν(d) 1 99.253 5.400 1.48749 70.2 2 1397.368 0.200 3 100.745 1.950 1.83400 37.2 4 56.982 7.700 1.49700 81.6 5 585.095 D5 6 -141.620 0.960 1.65160 58.5 7 32.543 1.400 8 32.259 2.150 1.84666 23.8 9 50.420 3.244 10 1510.480 2.700 1.91082 35.2 11 -54.493 0.200 12 417.468 1.200 1.83400 37.2 13 22.174 4.090 1.76182 26.5 14 70.614 3.490 15 -28.047 1.200 1.83400 37.2 16 -122.178 D16 17 Stop INFINITY 1.800 18 238.169 3.000 1.80400 46.5 19 -63.599 0.200 20 41.342 6.200 1.49700 81.6 21 -41.342 1.200 2.00100 29.1 22 -303.653 18.383 23 84.166 1.200 2.00100 29.1 24 35.196 5.700 1.48749 70.2 25 -75.219 0.200 26 65.603 3.200 1.91082 35.2 27 -332.779 D27 28 -875.660 2.130 1.84666 23.8 29 -54.081 1.980 30 -51.289 0.800 1.77250 49.6 31 32.834 D31 32 -27.290 1.300 1.48749 70.2 33 -45.252 0.200 34 56.317 5.900 1.57501 41.5 35 -58.451 1.200 1.90366 31.3 36 -368.732 D36 37 INFINITY 1.500 1.51633 64.1 38 INFINITY - (Table 2) [Various data] Infinity Close distance (object-image distance 0.9 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 4.6 5.2 5.7 4.6 5.2 5.7 f 72.08 135.00 291.32 67.32 110.85 157.13 Magnification 0.000 0.000 0.000 -0.094 -0.169 -0.320 W 17.2 9.1 4.2 17.3 9.1 4.4 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 42.56 55.31 66.55 42.56 55.31 66.55 L 190.18 223.07 259.23 190.18 223.07 259.23 D5 4.770 37.655 73.817 4.770 37.655 73.817 D16 26.036 13.284 2.046 26.036 13.284 2.046 D27 3.798 7.090 6.039 5.034 10.603 18.550 D31 22.540 19.248 20.299 21.304 15.735 7.788 D36 40.573 53.325 64.563 40.573 53.325 64.563 (Table 3) [Zoom lens group data] Group Starting surface Focal length 1 1 161.89 2 6 -29.08 3 18 35.49 4 28 -43.86 5 32 3569.92

[0140] [Numerical Example 2] Figures 17 to 25 and Tables 4 to 6 show the zoom lens of Numerical Example 2. Figure 17 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figures 18 and 19 are diagrams of longitudinal aberration at infinity focus at the short focal length end and the long focal length end. Figures 20 and 21 are diagrams of lateral aberration at infinity focus at the short focal length end and the long focal length end. Figures 22 and 23 are diagrams of longitudinal aberration at focus with an object-image distance of 0.9 m at the short focal length end and the long focal length end. Figures 24 and 25 are diagrams of lateral aberration at focus with an object-image distance of 0.9 m at the short focal length end and the long focal length end. Table 4 is surface data, Table 5 is various data, and Table 6 is zoom lens group data.

[0141] The zoom lens of Numerical Example 2 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power (lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (focusing lens group GF), and a sixth lens group G6 with positive refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the sixth lens group G6 and the image plane, a parallel plate CG is provided.

[0142] The first lens group G1 is composed of, in order from the object side, a biconvex positive lens 11B, a negative meniscus lens 12B convex on the object side, and a positive meniscus lens 13B convex on the object side. The negative meniscus lens 12B and the positive meniscus lens 13B are joined.

[0143] The second lens group G2 is composed of, in order from the object side, a biconcave negative lens 21B, a positive meniscus lens 22B convex on the object side, a plano-convex positive lens 23B convex on the image side, a biconcave negative lens 24B, a positive meniscus lens 25B convex on the object side, and a negative meniscus lens 26B convex on the image side. The biconcave negative lens 24B and the positive meniscus lens 25B are joined.

[0144] The third lens group G3 is composed of, in order from the object side, a biconvex positive lens 31B, a biconvex positive lens 32B, and a negative meniscus lens 33B convex on the image side. The biconvex positive lens 32B and the negative meniscus lens 33B are joined.

[0145] The fourth lens group G4 is composed of, in order from the object side, a negative meniscus lens 41B (negative lens L2N) convex on the object side, a biconvex positive lens 42B (positive lens L2P), and a positive meniscus lens 43B (positive lens L1P) convex on the object side. The negative meniscus lens 41B (negative lens L2N) and the biconvex positive lens 42B (positive lens L2P) are joined together and constitute a positive lens component L2. The positive meniscus lens 43B (positive lens L1P) constitutes a positive lens component L1.

[0146] The fifth lens group G5 is composed of, in order from the object side, a biconvex positive lens 51B (positive lens GFP) and a biconcave negative lens 52B (negative lens GFN).

[0147] The sixth lens group G6 is composed of, in order from the object side, a negative meniscus lens 61B convex on the image side and a biconvex positive lens 62B.

[0148] (Table 4) [Surface data] Zoom ratio 4.05 Surface number R D N(d) ν(d) 1 118.000 4.400 1.48749 70.2 2 -21975.397 0.200 3 130.672 1.950 1.80440 39.6 4 61.654 7.700 1.53775 74.7 5 17419.442 D5 6 -305.065 0.960 1.76200 40.1 7 29.167 0.569 8 29.456 3.600 1.65412 39.7 9 161.556 3.599 10 INFINITY 2.700 1.59270 35.3 11 -67.668 3.405 12 -109.802 1.200 1.77250 49.6 13 26.122 3.000 1.80518 25.4 14 89.182 2.990 15 -40.185 1.200 1.59522 67.7 16 -210.247 D16 17 Infinite 1.800 18 156.117 3.500 1.80400 46.5 19 -87.190 0.200 20 38.380 6.200 1.49700 81.6 21 -49.698 1.200 2.00100 29.1 22 -1480.388 D22 23 62.249 1.200 2.00100 29.1 24 30.004 5.700 1.53775 74.7 25 -146.839 0.200 26 66.574 3.200 1.95375 32.3 27 1994.267 D27 28 960.353 2.130 1.84666 23.8 29 -54.671 2.677 30 -45.887 0.800 1.75700 47.8 31 31.355 D31 32 -26.907 1.300 1.83400 37.2 33 -47.676 0.200 34 87.528 3.400 1.58913 61.2 35 -95.902 D35 36 Infinite 1.500 1.51633 64.1 37 Infinite - (Table 5) [Various data] Infinity Close distance (object-image distance 0.9 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 4.6 5.1 5.8 4.6 5.1 5.6 f 71.90 135.00 291.36 67.02 110.68 154.21 Magnification 0.000 0.000 0.000 -0.094 -0.165 -0.314 W 17.2 9.0 4.2 17.3 9.2 4.4 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 40.31 51.04 63.67 40.31 51.04 63.67 L 193.32 231.85 262.35 193.32 231.85 262.35 D5 5.299 43.825 74.329 5.299 43.825 74.329 D16 31.284 19.386 2.497 31.284 19.386 2.497 D22 18.383 19.553 23.815 18.383 19.553 23.815 D27 3.798 4.862 6.039 5.176 8.702 20.257 D31 23.069 22.005 20.828 21.692 18.165 6.610 D35 38.321 49.050 61.676 38.321 49.050 61.676 (Table 6) [Zoom lens group data] Group Starting surface Focal length 1 1 167.26 2 6 -32.51 3 18 53.27 4 23 55.30 5 28 -44.52 6 32 6517.22

[0149] [Numerical Example 3] Figs. 26 to 34 and Tables 7 to 9 show the zoom lens of Numerical Example 3. Fig. 26 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figs. 27 and 28 are diagrams of longitudinal spherical aberration at infinity focus at the short focal length end and the long focal length end. Figs. 29 and 30 are diagrams of lateral spherical aberration at infinity focus at the short focal length end and the long focal length end. Figs. 31 and 32 are diagrams of longitudinal spherical aberration at focus with an object-image distance of 0.9 m at the short focal length end and the long focal length end. Figs. 33 and 34 are diagrams of lateral spherical aberration at focus with an object-image distance of 0.9 m at the short focal length end and the long focal length end. Table 7 is surface data, Table 8 is various data, and Table 9 is zoom lens group data.

[0150] The zoom lens of Numerical Example 3 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, a fifth lens group G5 (lens group GFF with positive refractive power), a sixth lens group G6 with negative refractive power (focusing lens group GF), and a seventh lens group G7 with positive refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 constitute the "rear group". Between the third lens group G3 and the fourth lens group G4, a diaphragm SP for adjusting the amount of light that moves independently of each lens group is provided. Between the seventh lens group G7 and the image plane, a parallel plane plate CG is provided.

[0151] The first lens group G1 is composed of, in order from the object side, a positive meniscus lens 11C convex on the object side, a negative meniscus lens 12C convex on the object side, and a positive meniscus lens 13C convex on the object side.

[0152] The second lens group G2 is composed of, in order from the object side, a negative meniscus lens 21C convex on the object side, a biconvex positive lens 22C, a biconcave negative lens 23C, a biconcave negative lens 24C, and a positive meniscus lens 25C convex on the object side. The biconcave negative lens 24C and the positive meniscus lens 25C are joined together.

[0153] The third lens group G3 is composed of, in order from the object side, a biconvex positive lens 31C, a biconvex positive lens 32C, and a negative meniscus lens 33C convex on the image side. The biconvex positive lens 32C and the negative meniscus lens 33C are joined together.

[0154] The fourth lens group G4 is composed of a cemented lens of a biconcave negative lens 41C and a biconvex positive lens 42C, which are located in order from the object side.

[0155] The fifth lens group G5 is composed of, in order from the object side, a biconvex positive lens 51C, a biconvex positive lens 52C (positive lens L2P), a negative meniscus lens 53C (negative lens L2N) convex on the image side, and a positive meniscus lens 54C (positive lens L1P) convex on the object side. The biconvex positive lens 52C (positive lens L2P) and the negative meniscus lens 53C (negative lens L2N) are joined together and constitute a negative lens component L2. The positive meniscus lens 54C (positive lens L1P) constitutes a positive lens component L1.

[0156] The sixth lens group G6 is composed of, in order from the object side, a negative meniscus lens 61C convex on the object side, a biconvex positive lens 62C (positive lens GFP), and a biconcave negative lens 63C (negative lens GFN).

[0157] The seventh lens group G7 is composed of a biconvex positive lens 71C.

[0158] (Table 7) [Surface data] Zoom ratio 3.77 Surface number R D N(d) ν(d) 1 184.448 5.000 1.62299 58.2 2 1215.181 0.150 3 155.193 2.700 1.65412 39.7 4 83.735 0.110 5 83.943 9.280 1.43875 95.0 6 1729.280 D6 7 1702.867 1.000 1.78590 44.2 8 72.810 1.800 9 80.046 4.000 1.76385 48.5 10 -249.575 2.220 11 -2870.919 1.550 1.65160 58.5 12 66.949 5.400 13 -67.143 1.550 1.61800 63.4 14 83.339 3.000 1.85478 24.8 15 674.893 D15 16 416.366 5.440 1.43387 95.2 17 -67.052 0.180 18 79.949 5.970 1.49700 81.6 19 -76.526 1.600 1.90366 31.3 20 -262.745 D20 21 strands INFINITY D21 22 -50.524 1.400 1.59270 35.3 23 36.748 4.870 1.74077 27.8 24 -144.274 D24 25 4801.275 3.220 1.59551 39.2 26 -59.605 0.160 27 215.865 4.740 1.49700 81.6 28 -35.438 1.400 1.84666 23.8 29 -137.919 0.150 30 72.012 2.930 1.90043 37.4 31 220.196 D31 32 176.254 1.200 1.80400 46.5 33 39.636 4.080 34 337.790 3.160 1.85025 30.0 35 -40.505 1.330 36 -37.191 1.200 1.75500 52.3 37 55.973 D37 38 172.690 3.110 1.64000 60.1 39 -205.474 D39 40 INFINITY 1.500 1.51633 64.1 41 INFINITY - (Table 8) [Various data] Infinity Close distance (object-image distance 0.9 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 4.6 4.6 5.7 4.8 5.0 5.2 f 103.00 200.00 388.00 91.35 141.08 170.29 Magnification 0.000 0.000 0.000 -0.140 -0.236 -0.335 W 11.7 5.9 3.1 11.7 5.9 3.5 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 55.31 55.31 55.31 55.31 55.31 55.31 L 234.40 300.06 340.41 234.40 300.06 340.41 D6 1.500 67.152 107.506 1.500 67.152 107.506 D15 36.337 18.658 1.400 36.337 18.658 1.400 D20 1.610 22.809 11.000 1.610 22.809 11.000 D21 7.600 9.497 48.216 4.713 8.620 40.077 D24 19.569 14.153 4.500 22.456 15.030 12.640 D31 13.466 10.673 1.350 16.295 19.536 25.766 D37 15.115 17.908 27.231 12.286 9.046 2.815 D39 53.317 53.318 53.318 53.317 53.318 53.318 (Table 9) [Zoom lens group data] Group Starting surface Focal length 1 1 234.09 2 7 -64.07 3 16 84.15 4 22 -423.21 5 25 58.85 6 32 -37.70 7 38 147.08

[0159] [Numerical Example 4] Figures 35 to 43 and Tables 10 to 13 show the zoom lens of Numerical Example 4. Figure 35 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figures 36 and 37 are diagrams of longitudinal aberration at infinity focus at the short focal length end and the long focal length end. Figures 38 and 39 are diagrams of lateral aberration at infinity focus at the short focal length end and the long focal length end. Figures 40 and 41 are diagrams of longitudinal aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Figures 42 and 43 are diagrams of lateral aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Table 10 is surface data, Table 11 is various data, Table 12 is zoom lens group data, and Table 13 is aspherical data.

[0160] The zoom lens of Numerical Example 4 is composed of, in order from the object side, a first lens group G1 with a positive refractive power, a second lens group G2 with a negative refractive power, a third lens group G3 with a positive refractive power, a fourth lens group G4 with a negative refractive power, a fifth lens group G5 with a positive refractive power (lens group GFF with a positive refractive power), a sixth lens group G6 with a negative refractive power (focusing lens group GF), a seventh lens group G7 with a positive refractive power, and an eighth lens group G8 with a negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the eighth lens group G8 and the image plane, a parallel plate CG is provided.

[0161] The first lens group G1 is composed of, in order from the object side, a positive meniscus lens 11D convex on the object side, a negative meniscus lens 12D convex on the object side, and a positive meniscus lens 13D convex on the object side. The negative meniscus lens 12D and the biconvex positive lens 13D are joined.

[0162] The second lens group G2 is composed of, in order from the object side, a biconcave negative lens 21D, a positive meniscus lens 22D convex on the object side, a biconvex positive lens 23D, a biconcave negative lens 24D, and a biconcave negative lens 25D. The biconvex positive lens 23D and the biconcave negative lens 24D are joined.

[0163] The third lens group G3 is composed of a biconvex positive lens 31D.

[0164] The fourth lens group G4 is composed of a negative meniscus lens 41D convex on the image side.

[0165] The fifth lens group G5 is composed of, in order from the object side, a positive meniscus lens 51D convex toward the image side, a biconvex positive lens 52D (positive lens L2P), a negative meniscus lens 53D (negative lens L2N) convex toward the image side, a negative meniscus lens 54D (negative lens L1N) convex toward the object side, and a biconvex positive lens 55D (positive lens L1P). The biconvex positive lens 52D (positive lens L2P) and the negative meniscus lens 53D (negative lens L2N) are joined together and constitute a negative lens component L2. The negative meniscus lens 54D (negative lens L1N) and the biconvex positive lens 55D (positive lens L1P) are joined together and constitute a positive lens component L1.

[0166] The sixth lens group G6 is composed of, in order from the object side, a biconvex positive lens 61D (positive lens GFP) and a biconcave negative lens 62D (negative lens GFN). The biconvex positive lens 61D (positive lens GFP) and the biconcave negative lens 62D (negative lens GFN) are joined together.

[0167] The seventh lens group G7 is composed of a biconvex positive lens 71D.

[0168] The eighth lens group G8 is composed of a negative meniscus lens 81D convex toward the image side. An aspherical surface is formed on the object-side surface of the negative meniscus lens 81D.

[0169] (Table 10) [Surface Data] Zoom ratio 5.38 Surface number R D N(d) ν(d) 1 104.065 6.690 1.59522 67.7 2 382.421 0.200 3 97.507 2.800 1.83400 37.2 4 61.040 10.970 1.43875 95.0 5 534.823 D5 6 -313.905 1.600 1.90366 31.3 7 49.648 2.000 8 52.721 4.000 1.84666 23.8 9 3601.881 2.000 10 190.316 3.100 1.85025 30.0 11 -52.724 1.200 1.72000 50.2 12 59.705 4.000 13 -56.995 1.200 1.59410 60.5 14 645.309 D14 15 Strangle INFINITY 0.500 16 47.545 5.360 1.43875 95.0 17 -86.947 D17 18 -35.704 1.500 1.88100 40.1 19 -67.799 D19 20 -1121.378 4.600 1.74400 44.8 21 -43.867 3.690 22 85.425 5.130 1.49700 81.6 23 -37.446 1.700 2.00100 29.1 24 -215.449 0.200 25 119.472 1.200 2.00100 29.1 26 47.388 3.310 1.90366 31.3 27 -723.455 D27 28 1557.459 2.710 1.85478 24.8 29 -114.108 1.200 1.77250 49.6 30 46.445 D30 31 78.011 7.800 1.65412 39.7 32 -504.024 D32 33* -35.000 1.800 1.49710 81.6 34 -110.103 D34 35 INFINITY 1.500 1.51633 64.1 36 INFINITY - (Table 11) [Various data] Infinity Close distance (object-image distance 1.2 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 4.1 5.3 5.8 4.1 5.6 6.1 f 72.10 200.00 388.00 65.49 134.70 180.33 Magnification 0.000 0.000 0.000 -0.066 -0.168 -0.277 W 17.4 6.3 3.3 17.8 6.5 3.6 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 8.34 21.09 32.23 8.34 21.09 32.23 L 198.41 248.03 285.17 198.41 248.03 285.17 D5 3.500 53.119 90.266 3.500 53.119 90.266 D14 27.755 5.460 1.610 27.755 5.460 1.610 D17 4.922 11.874 15.246 2.805 5.780 4.864 D19 11.460 4.507 1.135 13.577 10.602 11.518 D27 22.779 22.715 3.270 25.125 32.883 31.183 D30 6.930 21.289 54.992 4.583 11.121 27.079 D32 32.257 27.511 5.961 32.257 27.511 5.961 D34 6.355 19.101 30.242 6.355 19.101 30.242 (Table 12) [Zoom lens group data] Group Starting surface Focal length 1 1 178.37 2 6 -44.40 3 16 70.92 4 18 -87.52 5 20 48.61 6 28 -65.21 7 31 103.83 8 33 -104.05 (Table 13) [Aspherical Data] NO.33 K=-0.338 A4=0.6191E-05 A6=0.2880E-09 A8=-0.2054E-11 A10=0.2950E-14

[0170] [Numerical Example 5] Figures 44 to 52 and Tables 14 to 17 show the zoom lens of Numerical Example 5. Figure 44 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figures 45 and 46 are diagrams of longitudinal aberration at infinity focus at the short focal length end and the long focal length end. Figures 47 and 48 are diagrams of lateral aberration at infinity focus at the short focal length end and the long focal length end. Figures 49 and 50 are diagrams of longitudinal aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Figures 51 and 52 are diagrams of lateral aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Table 14 is surface data, Table 15 is various data, Table 16 is zoom lens group data, and Table 17 is aspherical data.

[0171] The zoom lens of Numerical Example 5 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, a fifth lens group G5 with positive refractive power (lens group GFF with positive refractive power), a sixth lens group G6 with negative refractive power (focusing lens group GF), a seventh lens group G7 with positive refractive power, and an eighth lens group G8 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, the seventh lens group G7, and the eighth lens group G8 constitute the "rear group". Between the second lens group G2 and the third lens group G3 (immediately before the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the eighth lens group G8 and the image plane, a parallel plate CG is provided.

[0172] The first lens group G1 is composed of, in order from the object side, a positive meniscus lens 11E convex on the object side, a negative meniscus lens 12E convex on the object side, and a positive meniscus lens 13E convex on the object side. The negative meniscus lens 12E and the positive meniscus lens 13E are joined.

[0173] The second lens group G2 is composed of, in order from the object side, a biconcave negative lens 21E, a positive meniscus lens 22E convex on the object side, a biconvex positive lens 23E, a biconcave negative lens 24E, and a negative meniscus lens 25E convex on the image side. The biconvex positive lens 23E and the biconcave negative lens 24E are joined.

[0174] The third lens group G3 is composed of a biconvex positive lens 31E.

[0175] The fourth lens group G4 is composed of a negative meniscus lens 41E convex on the image side.

[0176] The fifth lens group G5 is composed of, in order from the object side, a positive meniscus lens 51E convex toward the image side, a biconvex positive lens 52E (positive lens L2P), a negative meniscus lens 53E (negative lens L2N) convex toward the image side, and a biconvex positive lens 54E (positive lens L1P). The biconvex positive lens 52E (positive lens L2P) and the negative meniscus lens 53E (negative lens L2N) are joined and constitute a negative lens component L2. The biconvex positive lens 54E (positive lens L1P) constitutes a positive lens component L1.

[0177] The sixth lens group G6 is composed of, in order from the object side, a biconvex positive lens 61E (positive lens GFP), a biconcave negative lens 62E (negative lens GFN), and a positive meniscus lens 63E convex toward the object side. The biconvex positive lens 61E (positive lens GFP) and the biconcave negative lens 62E (negative lens GFN) are joined.

[0178] The seventh lens group G7 is composed of a biconvex positive lens 71E.

[0179] The eighth lens group G8 is composed of a negative meniscus lens 81E convex toward the image side. An aspherical surface is formed on the object-side surface of the negative meniscus lens 81E.

[0180] (Table 14) [Surface Data] Zoom ratio 5.38 Surface number R D N(d) ν(d) 1 104.176 6.690 1.59522 67.7 2 380.855 0.200 3 97.664 2.800 1.83400 37.2 4 60.661 10.970 1.43875 95.0 5 526.158 D5 6 -306.086 1.600 1.88100 40.1 7 48.697 2.000 8 52.215 4.000 1.85025 30.0 9 2988.601 2.000 10 187.409 3.100 1.85025 30.0 11 -61.975 1.200 1.65160 58.5 12 49.512 4.000 13 -56.322 1.200 1.69680 55.5 14 -782.477 D14 15絞 INFINITY 0.500 16 46.973 5.360 1.43875 95.0 17 -88.408 D17 18 -35.684 1.500 1.89190 37.1 19 -68.241 D19 20 -926.897 4.600 1.74320 49.3 21 -43.656 3.690 22 91.191 5.130 1.49700 81.6 23 -37.058 1.700 2.00100 29.1 24 -234.678 0.200 25 127.192 4.510 2.00100 29.1 26 -1078.467 D26 27 2112.091 2.710 1.85478 24.8 28 -98.081 1.200 1.78800 47.4 29 44.447 2.000 30 47.601 2.300 1.48749 70.2 31 56.986 D31 32 77.448 11.306 1.65412 39.7 33 -481.206 D33 34* -35.000 1.800 1.49710 81.6 35 -115.109 D35 36 INFINITY 1.500 1.51633 64.1 37 INFINITY - (Table 15) [Various data] Infinity Close distance (object-image distance 1.2 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 4.1 5.3 5.8 4.1 5.6 6.1 f 72.10 200.00 388.00 65.62 135.66 181.00 Magnification 0.000 0.000 0.000 -0.067 -0.168 -0.277 W 17.4 6.3 3.3 17.8 6.5 3.6 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 7.38 20.05 33.49 7.38 20.05 33.49 L 205.62 256.35 292.36 205.62 256.35 292.36 D5 3.500 54.231 90.245 3.500 54.231 90.245 D14 27.755 5.650 1.610 27.755 5.650 1.610 D17 7.280 13.786 18.125 5.203 7.741 7.801 D19 11.460 4.954 0.615 13.536 10.999 10.938 D26 20.661 22.538 3.270 22.962 32.622 31.024 D31 6.930 22.936 50.775 4.628 12.852 23.021 D33 32.383 23.941 5.961 32.383 23.941 5.961 D35 5.393 18.056 31.505 5.393 18.056 31.505 (Table 16) [Zoom lens group data] Group Starting surface Focal length 1 1 180.87 2 6 -44.24 3 16 70.77 4 18 -85.72 5 20 48.18 6 27 -66.84 7 32 102.81 8 34 -101.93 (Table 17) [Aspherical Data] NO.34 K=-0.338 A4=0.6191E-05 A6=0.2880E-09 A8=-0.2054E-11 A10=0.2950E-14

[0181] [Numerical Example 6] Figures 53 to 61 and Tables 18 to 20 show the zoom lens of Numerical Example 6. Figure 53 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figures 54 and 55 are longitudinal aberration diagrams at infinity focus at the short focal length end and the long focal length end, respectively. Figures 56 and 57 are lateral aberration diagrams at infinity focus at the short focal length end and the long focal length end, respectively. Figures 58 and 59 are longitudinal aberration diagrams at focus with an object-image distance of 1.5 m at the short focal length end and the long focal length end, respectively. Figures 60 and 61 are lateral aberration diagrams at focus with an object-image distance of 1.5 m at the short focal length end and the long focal length end, respectively. Table 18 is surface data, Table 19 is various data, and Table 20 is zoom lens group data.

[0182] The zoom lens of Numerical Example 6 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power (lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (focusing lens group GF), and a sixth lens group G6 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, and the sixth lens group G6 constitute the "rear group". Between the third lens group G3 and the fourth lens group G4 (immediately behind the third lens group G3), a diaphragm SP for adjusting the amount of light that moves integrally with the third lens group G3 is provided. Between the sixth lens group G6 and the image plane, a parallel plane plate CG is provided.

[0183] The first lens group G1 is composed of, in order from the object side, a negative meniscus lens 11F convex on the object side, a positive meniscus lens 12F convex on the object side, and a biconvex positive lens 13F.

[0184] The second lens group G2 is composed of, in order from the object side, a biconvex positive lens 21F, a biconcave negative lens 22F, a positive meniscus lens 23F convex on the object side, a biconvex positive lens 24F, a biconcave negative lens 25F, a biconcave negative lens 26F, and a biconvex positive lens 27F. The biconcave negative lens 26F and the biconvex positive lens 27F are joined together.

[0185] The third lens group G3 is composed of, in order from the object side, a biconvex positive lens 31F, a biconvex positive lens 32F, a biconcave negative lens 33F, a positive meniscus lens 34F convex on the object side, and a negative meniscus lens 35F convex on the object side. The biconvex positive lens 32F and the biconcave negative lens 33F are joined together.

[0186] The fourth lens group G4 is composed of, in order from the object side, a biconvex positive lens 41F (positive lens L2P), a negative meniscus lens 42F (negative lens L2N) convex on the image side, and a positive meniscus lens 43F (positive lens L1P) convex on the object side. The biconvex positive lens 41F (positive lens L2P) and the negative meniscus lens 42F (negative lens L2N) are joined together and constitute a positive lens component L2. The positive meniscus lens 43F (positive lens L1P) constitutes a positive lens component L1.

[0187] The fifth lens group G5 is composed of, in order from the object side, a negative meniscus lens 51F convex on the object side, a biconcave negative lens 52F (negative lens GFN), and a positive meniscus lens 53F (positive lens GFP) convex on the object side. The biconcave negative lens 52F (negative lens GFN) and the positive meniscus lens 53F (positive lens GFP) are joined together.

[0188] The sixth lens group G6 is composed of a biconcave negative lens 61F.

[0189] (Table 18) [Surface data] Zoom ratio 3.77 Plane number R D N(d) ν(d) 1 220.319 3.000 1.83400 37.3 2 127.262 0.200 3 126.500 9.800 1.49700 81.6 4 774.194 0.150 5 166.193 9.300 1.43700 95.1 6 -1868.579 D6 7 291.576 3.780 1.74000 28.3 8 -494.359 19.000 9 -173.577 1.000 1.80400 46.5 10 60.827 2.000 11 55.256 3.000 1.86966 20.0 12 98.474 6.092 13 95.553 4.500 1.69930 51.1 14 -107.486 1.808 15 -167.295 1.500 1.80610 40.9 16 70.631 5.000 17 -47.183 1.500 1.74400 44.8 18 94.272 4.000 1.65412 39.7 19 -103.915 D19 20 661.049 3.873 1.77250 49.6 21 -66.823 0.150 22 64.592 5.004 1.49700 81.6 23 -52.657 1.000 1.91082 35.2 24 101.219 0.150 25 37.470 4.206 1.67300 38.3 26 110.715 2.455 27 35.363 1.000 1.83481 42.7 28 28.918 5.761 29 aperture INFINITY D29 30 208.171 4.150 1.61340 44.3 31 -34.586 1.000 2.00100 29.1 32 -63.459 0.150 33 106.953 2.570 1.90043 37.4 34 392.438 D34 35 90.490 1.000 1.90366 31.3 36 34.131 4.982 37 -285.596 1.000 1.49700 81.6 38 35.810 4.059 1.78880 28.4 39 410.899 D39 40 -127.507 1.500 1.48749 70.2 41 1090.662 D41 42 INFINITY 1.500 1.51633 64.1 43 INFINITY - (Table 19) [Various data] Infinity Near distance (Object distance 1.5m) Wide-angle Mid-range Telephoto Wide-angle Mid-range Telephoto FNO. 5.3 5.4 6.5 5.4 5.8 7.9 f 154.50 250.00 582.00 132.05 185.45 242.46 Magnification 0.000 0.000 0.000 -0.110 -0.157 -0.322 W 7.8 4.8 2.1 7.7 4.9 2.0 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 50.52 57.89 84.97 50.52 57.89 84.97 L 302.82 368.86 411.23 302.82 368.86 411.23 D6 33.864 99.903 142.276 33.864 99.903 142.276 D19 32.302 33.109 3.500 32.302 33.109 3.500 D29 30.133 21.957 24.487 30.133 21.957 24.487 D34 18.026 8.984 1.998 23.350 18.465 33.883 D39 18.328 27.370 34.356 13.004 17.889 2.471 D41 48.535 55.904 82.982 48.535 55.904 82.982 (Table 20) [Zoom lens group data] Group Starting surface Focal length 1 1 297.09 2 7 -56.33 3 20 81.63 4 30 73.05 5 35 -87.07 6 40 -234.09

[0190] [Numerical Example 7] Figures 62 to 70 and Tables 21 to 23 show the zoom lens of Numerical Example 7. Figure 62 is a diagram showing the lens configuration at infinity focus at the short focal length end. Figures 63 and 64 are diagrams of longitudinal aberration at infinity focus at the short focal length end and the long focal length end. Figures 65 and 66 are diagrams of lateral aberration at infinity focus at the short focal length end and the long focal length end. Figures 67 and 68 are diagrams of longitudinal aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Figures 69 and 70 are diagrams of lateral aberration at focus with an object-image distance of 1.2 m at the short focal length end and the long focal length end. Table 21 is surface data, Table 22 is various data, and Table 23 is zoom lens group data.

[0191] The zoom lens of Numerical Example 7 is composed of, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power (lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (focusing lens group GF), a sixth lens group G6 with positive refractive power (focusing lens group GFRP), and a seventh lens group G7 with negative refractive power. The third lens group G3, the fourth lens group G4, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7 constitute the "rear group". Between the second lens 42G and the third lens 43G of the fourth lens group G4, a diaphragm SP for adjusting the amount of light that moves integrally with the fourth lens group G4 is provided. Between the seventh lens group G7 and the image plane, a parallel plate CG is provided.

[0192] The first lens group G1 is composed of, in order from the object side, a negative meniscus lens 11G convex on the object side, a biconvex positive lens 12G, and a positive meniscus lens 13G convex on the object side. The negative meniscus lens 11G and the biconvex positive lens 12G are joined.

[0193] The second lens group G2 is composed of, in order from the object side, a biconvex positive lens 21G, a negative meniscus lens 22G convex on the object side, a biconcave negative lens 23G, a positive meniscus lens 24G convex on the object side, and a biconcave negative lens 25G. The biconcave negative lens 23G and the positive meniscus lens 24G are joined.

[0194] The third lens group G3 is composed of a biconvex positive lens 31G.

[0195] The fourth lens group G4 is composed of, in order from the object side, a biconvex positive lens 41G, a biconcave negative lens 42G, a biconcave negative lens 43G, a negative meniscus lens 44G (negative lens L2N) convex on the object side, a biconvex positive lens 45G (positive lens L2P), and a positive meniscus lens 46G (positive lens L1P) convex on the object side. The negative meniscus lens 44G (negative lens L2N) and the biconvex positive lens 45G (positive lens L2P) are joined together and constitute a positive lens component L2. The positive meniscus lens 46G (positive lens L1P) constitutes a positive lens component L1.

[0196] The fifth lens group G5 is composed of, in order from the object side, a positive meniscus lens 51G (positive lens GFP) convex on the image side and a biconcave negative lens 52G (negative lens GFN). The positive meniscus lens 51G (positive lens GFP) and the biconcave negative lens 52G (negative lens GFN) are joined together.

[0197] The sixth lens group G6 is composed of a biconvex positive lens 61G.

[0198] The seventh lens group G7 is composed of, in order from the object side, a biconcave negative lens 71G and a biconvex positive lens 72G.

[0199] (Table 21) [Surface data] Zoom ratio 2.83 Surface number R D N(d) ν(d) 1 193.512 2.400 1.90366 31.3 2 82.686 10.180 1.49700 81.6 3 -451.165 0.200 4 72.421 8.780 1.43700 95.1 5 549.259 D5 6 141.133 5.050 1.85478 24.8 7 -421.355 2.134 8 20392.485 2.800 1.57501 41.5 9 66.706 5.000 10 -226.826 1.600 1.59349 67.0 11 57.892 3.500 1.84666 23.8 12 132.431 4.735 13 -68.309 1.500 1.58267 46.5 14 116.510 D14 15 131.781 6.459 1.74100 52.7 16 -83.245 D16 17 78.287 8.430 1.43700 95.1 18 -56.310 1.300 1.72000 50.2 19 2545.556 3.585 20 strands INFINITY 4.000 21 -143.686 1.800 1.74950 35.3 22 125.656 2.433 23 102.485 1.300 1.85478 24.8 24 43.003 7.200 1.69680 55.5 25 -114.001 0.200 26 56.611 3.576 1.90043 37.4 27 96.667 D27 28 -236.335 3.330 1.84666 23.8 29 -41.240 0.800 1.65412 39.7 30 40.597 D30 31 118.655 4.642 1.59349 67.0 32 -105.336 D32 33 -73.711 1.500 1.88300 40.8 34 155.486 6.110 35 85.318 5.620 1.72825 28.5 36 -162.178 D36 37 Infinity 1.500 1.51633 64.1 38 Infinity - (Table 22) [Various data] Infinity Close distance (object-image distance 1.2 m) Wide angle Medium Telephoto Wide angle Medium Telephoto FNO. 2.9 3.6 4.1 2.9 3.5 4.1 f 103.00 200.00 292.00 96.53 158.13 187.60 Magnification 0.000 0.000 0.000 -0.097 -0.171 -0.241 W 11.9 6.0 4.1 11.9 6.3 4.4 Y 21.64 21.64 21.64 21.64 21.64 21.64 BF 18.00 18.00 18.00 18.00 18.00 18.00 L 259.72 259.72 259.72 259.72 259.72 259.72 D5 1.528 28.745 41.231 1.528 28.745 41.231 D14 58.612 23.382 2.000 58.612 23.382 2.000 D16 1.000 9.012 17.908 1.000 9.012 17.908 D27 10.551 14.035 10.471 11.788 19.630 24.175 D30 41.491 50.628 57.873 34.070 26.324 14.824 D32 18.372 5.750 2.070 24.556 24.460 31.415 D36 16.011 16.011 16.011 16.011 16.011 16.011 (Table 23) [Zoom lens group data] Group Starting surface Focal length 1 1 163.25 2 6 -56.29 3 15 69.74 4 17 133.08 5 28 -66.26 6 31 94.75 7 33 -329.73

[0200] Table 24 shows the relationship between the image shake correction amounts of Numerical Examples 1 to 7 and the movement amounts of the anti-shake lens group corresponding thereto. The unit of this movement amount is millimeter [mm]. (Table 24) Vibration-proof correction amount Driving amount Wide-angle end Middle Telephoto end Example 1 ±0.40° ±0.524 ±0.677 ±0.998 Example 2 ±0.40° ±0.278 ±0.384 ±0.550 Example 3 ±0.35° ±0.370 ±0.538 ±0.745 Example 4 ±0.35° ±0.409 ±0.619 ±1.002 Example 5 ±0.35° ±0.572 ±0.607 ±0.958 Example 6 ±0.28° ±0.638 ±0.896 ±1.212 Example 7 ±0.40° ±0.369 ±0.666 ±0.979

[0201] Table 25 shows the values for each conditional expression of Numerical Examples 1 to 7. (Table 25) Example 1 Example 2 Example 3 Example 4 Conditional expression (1) 1.91082 1.95375 1.90043 1.90366 Conditional expression (2) 35.25 32.32 37.37 31.31 Conditional expression (3) -0.81 -1.24 -1.56 -0.75 Conditional expression (4) 1.35 1.30 1.23 1.34 Conditional expression (5) 0.41 0.39 0.29 0.36 Conditional expression (6) 1.70 1.30 2.00 2.72 Conditional expression (7) 4.24 3.15 6.23 2.71 Conditional expression (8) 0.89 0.90 0.88 0.73 Conditional expression (9) 0.56 0.57 0.60 0.46 Conditional expression (10) 0.66 0.73 1.70 0.68 Conditional expression (11) -5.57 -5.14 -3.65 -4.02 Conditional expression (12) 49.60 47.82 52.32 49.60 Conditional expression (13) -2.63 -2.50 -1.45 -2.92 Conditional expression (14) 0.48 0.50 0.57 0.50 Conditional expression (15) 0.12 0.12 0.12 0.22 Conditional expression (16) -81.40 -146.38 -3.90 -17.04 Conditional expression (17) 8.30 7.39 6.48 4.71 Conditional expression (18) -1.01 -1.14 -0.83 -0.88 Conditional expression (19) 1.12 1.16 1.17 1.07 Conditional expression (20) 0.43 0.41 0.45 0.49 Conditional expression (21) -0.82 -0.89 -0.55 -0.59 Conditional expression (22) 1.45 1.50 1.05 0.98 Conditional expression (23) 2.03 3.69 3.14 2.34 Conditional expression (24) - - - - Conditional expression (25) - - - - Conditional expression (26) - - - - Conditional expression (27) 2.00100 - - - Conditional expression (28) 2.00100 - - - Conditional expression (29) 0.47 - - - Conditional expression (30) 1.02 - - - Example 5 Example 6 Example 7 Conditional expression (1) 2.00100 1.90043 1.90043 Conditional expression (2) 29.13 37.37 37.37 Conditional expression (3) -0.72 -0.84 -2.01 Conditional expression (4) 1.34 1.34 1.09 Conditional expression (5) 0.36 0.36 0.45 Conditional expression (6) 2.36 2.23 1.09 Conditional expression (7) 2.39 0.82 0.65 Conditional expression (8) 0.75 0.71 0.89 Conditional expression (9) 0.47 0.51 0.56 Conditional expression (10) 0.66 0.65 0.85 Conditional expression (11) -4.09 -5.27 -2.90 Conditional expression (12) 47.37 81.61 39.68 Conditional expression (13) -2.84 -0.77 -1.88 Conditional expression (14) 0.52 0.35 0.60 Conditional expression (15) 0.21 0.12 0.28 Conditional expression (16) -14.95 -2.69 -2.29 Conditional expression (17) 4.59 7.40 3.76 Conditional expression (18) -0.91 -0.81 -1.01 Conditional expression (19) 1.08 0.99 0.94 Conditional expression (20) 0.48 0.36 0.24 Conditional expression (21) -0.59 -0.51 -1.01 Conditional expression (22) 1.08 1.09 1.34 Conditional expression (23) 2.45 2.34 2.08 Conditional expression (24) - - 67.00 Conditional expression (25) - - 1.59349 Conditional expression (26) - - 0.699 Conditional expression (27) - - - Conditional expression (28) - - - Conditional expression (29) - - - Conditional expression (30) - - -

[0202] As is clear from Table 25, Numerical Examples 1 to 7 satisfy Conditional Expressions (1) to (30), and as is clear from the longitudinal aberration diagram and the lateral aberration diagram, various aberrations are corrected relatively well. Also, despite the small number of lens elements constituting the focusing lens, aberration variations due to changes in the shooting distance are suppressed at both the short focal length end and the long focal length end, and aberration variations during anti-shake driving are also corrected well.

[0203] Even if a lens or lens group having substantially no power is added to the zoom lens included in the claims of the present invention, it is included in the technical scope of the present invention (it does not avoid the technical scope of the present invention).

[0204] The zoom lens of the present embodiment is not limited to the 5-group zoom, 6-group zoom, 7-group zoom, or 8-group zoom shown in the above-described numerical examples. Also, an aspherical surface or a diffractive surface may be used on any surface, and the aspherical surface may be a glass molded aspherical surface or a ground aspherical surface directly formed on the lens surface, a hybrid aspherical lens (hybrid lens) in which a resin layer is applied on the lens surface and an aspherical surface is applied thereon, a plastic aspherical surface in which the lens itself is made of a resin material, or the like.

[0205] With reference to FIGS. 71 and 72, a digital camera (imaging device) 100 equipped with the zoom lens of the present embodiment will be described.

[0206] The digital camera 100 includes a camera body (housing) 101, a photographing lens 102, a finder 103, a flash 104, a shutter button 105, a power button 106, a liquid crystal monitor 107, operation buttons 108, a memory card slot 109, and a zoom switch 110.

[0207] The camera body 101 houses each component of the digital camera 100. The shooting lens 102 is, for example, a unit in which the zoom lens of the present embodiment is incorporated into a lens barrel. The viewfinder 103 is a peephole for determining the subject and composition. The flash 104 emits a flash during night shooting or shooting in a dark place. The shutter button 105 is a physical switch for executing shooting by the digital camera 100. The power button 106 is a physical switch for switching the power of the digital camera 100 on and off. The liquid crystal monitor 107 displays a captured image or the like by the digital camera 100. The operation button 108 is a physical switch for setting the shooting mode or the like of the digital camera 100. The memory card slot 109 is a slot for inserting a memory card (not shown) that stores a captured image or the like by the digital camera 100. The zoom switch 110 is a physical switch for performing zooming between the wide-angle end and the telephoto end. By operating the zoom switch 110, the interval between the lens groups of the zoom lens of the present embodiment is appropriately changed.

[0208] As internal functional components of the digital camera 100, the digital camera 100 includes a central processing unit 111, an image processing unit 112, a light receiving element 113, a signal processing unit 114, a semiconductor memory 115, and a communication card 116.

[0209] The central processing unit 111 performs various arithmetic processes inside the digital camera 100. The image processing unit 112 performs various image processes on the captured image by the digital camera 100. The light receiving element 113 takes in and receives external light used for photometry processing. The signal processing unit 114 performs various signal processes such as a shooting instruction signal and an image processing signal. The semiconductor memory 115 constitutes a temporary storage area for the captured image by the digital camera 100. The communication card 116 is for enabling wireless communication with an external device (not shown).

[0210] The configuration of the digital camera 100 described here is merely an example, and various design changes are possible (there is freedom in the specific embodiment of the digital camera 100).

[0211] In addition, the zoom lens of the present embodiment can be applied not only to the digital camera 100 described above, but also to, for example, interchangeable lenses, portable information terminal devices, video cameras, silver halide cameras, optical sensors, projection optical systems (projectors), etc.

[0212] FIG. 73 is a diagram showing an example of the external configuration of a lens barrel (imaging device) LX equipped with the zoom lens according to the present embodiment. The lens barrel LX is configured as, for example, a zoom interchangeable lens for a single-lens reflex camera. The lens barrel LX includes a fixed barrel 10, and a lens mount 100LM is fixed to the rear side surface of the fixed barrel 10. A zoom ring 11 is fitted on the circumferential surface of the fixed barrel 10 in the front region in the optical axis direction, and a focus ring 12 is fitted in the rear region. Rubber rings ZG and FG are fixed to the circumferential surfaces of these zoom ring 11 and focus ring 12, respectively, to enhance the feel during operation.

[0213] The lens barrel LX is detachable from a camera body (not shown) by a lens mount 100LM provided on the fixed barrel 10, and can be zoomed to the telephoto (long focus) side and the wide-angle (short focus) side by rotating the zoom ring 11. Further, by operating the zoom ring 11 further to the short focus side while pressing the retractable button B disposed on the circumferential surface, the lens barrel LX can be set to the retracted state where the length is minimized. Focusing is automatically performed by a built-in motor, but manual focusing is also possible by rotating the focus ring 12.

[0214] Inside the fixed cylinder 10, an outer direct-acting cylinder 13 and an inner direct-acting cylinder (not shown) are coaxially arranged with a required gap in the cylinder diameter direction. These direct-acting cylinders are integrated with each other at their respective rear ends, and are linearly moved in the optical axis direction integrally inside the fixed cylinder 10 as the zoom ring 11 rotates due to the cam engagement between the linear groove in the optical axis direction provided on the fixed cylinder 10 and the cam groove provided on the zoom ring 11.

[0215] Although not shown, a helicoid cylinder with a helicoid groove formed on its outer peripheral surface is fitted on the outer periphery of the inner direct-acting cylinder. This helicoid cylinder is moved in the cylinder axis direction integrally with the inner direct-acting cylinder, but is linked to the zoom ring 11 and is rotationally moved around the cylinder axis on the circumferential surface of the inner direct-acting cylinder as the zoom ring 11 rotates. Also, a front direct-acting cylinder 16 is fitted between the helicoid cylinder and the outer direct-acting cylinder 13 in the radial direction. This front direct-acting cylinder 16 is fitted into the helicoid groove of the helicoid cylinder and is moved in the optical axis direction by the rotation of the helicoid cylinder. A lens L1 is supported at the front end of this front direct-acting cylinder 16. The lens L1 depicted in Fig. 73 can be, for example, the lens (11A, 11B, 11C, 11D, 11E, 11F, 11G) located on the most object side of the first lens group G1 of the zoom lens of the present embodiment. Further, components for exerting and assisting the functions of the zoom lens of the present embodiment (for example, an ON / OFF changeover switch for anti-vibration drive) are provided on the lens barrel LX.

Explanation of Signs

[0216] G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group G5 Fifth lens group G6 Sixth lens group G7 Seventh lens group G8 Eighth lens group GF Focusing lens group GFP Positive lens GFN Negative lens GFF Lens group with positive refractive power arranged adjacent to the object side of the focusing lens group GFRP Focusing Lens Group L1 Positive Lens Component L1P Positive Lens L1N Negative Lens L2 Positive or Negative Lens Component L2P Positive Lens L2N Negative Lens L3P Positive Lens L3N Negative Lens L4P Positive Lens LX Lens Barrel (Imaging Device) 100 Digital Camera (Imaging Device)

Claims

1. It has, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group, When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power, Among the lens groups with a negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, It has at least one lens group located on the image side of the focusing lens group GF, Among the lens groups with a positive refractive power included in the rear group, the lens group GFF with a positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, The positive lens component L1 has a positive lens L1P, It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, The focusing lens group GF has at least one negative lens and at least one positive lens, Satisfies the following conditional expressions (1'), (2), (8A), (13A), A zoom lens characterized by this. (1') 1.87 < NdL1P (2) 25 < νdL1P (8A) 0.1 < TLT / fT ≤ 0.90 (13A) -4 < fGFP / fGFN < -0.5 However, NdL1P: The refractive index of the positive lens L1P, νdL1P: The Abbe number of the positive lens L1P, TLT: The overall lens length at infinity focus at the long focal length end, fT: The focal length of the entire system at infinity focus at the long focal length end, fGFP: The focal length of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: The focal length of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF.

2. It has, in order from the object side, a first lens group with a positive refractive power, a second lens group with a negative refractive power, and a rear group, When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with a negative refractive power and at least one lens group with a positive refractive power, Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, has at least one lens group located on the image side of the focusing lens group GF, Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, The positive lens component L1 has a positive lens L1P, has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, The focusing lens group GF has at least one negative lens and at least one positive lens, satisfies the following conditional expressions (1'), (2), (9A), and (13A), characterized by a zoom lens. (1') 1.87 < NdL1P (2) 25 < νdL1P (9A) 0.1 < f1 / fT < 0.7 (13A) -4 < fGFP / fGFN < -0.5 However, NdL1P: The refractive index of the positive lens L1P, νdL1P: The Abbe number of the positive lens L1P, f1: The focal length of the first lens group G1, fT: The overall focal length at infinity focus at the long focal length end, fGFP: The focal length of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: The focal length of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF.

3. Has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, During zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, has at least one lens group located on the image side of the focusing lens group GF, Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, The positive lens component L1 has a positive lens L1P, It has a positive or negative lens component L2 positioned adjacent to the object side of the positive lens component L1, wherein the lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, the focusing lens group GF has at least one negative lens and at least one positive lens, and satisfies the following conditional expressions (1'), (2), (13A), and (17A), characterized in that it is a zoom lens. (1') 1.87 < NdL1P (2) 25 < νdL1P (13A) -4 < fGFP / fGFN < -0.5 (17A) 4.59 ≤ |(1 - M_GFT ２ ) × M_GFRT ２ | provided that NdL1P: the refractive index of the positive lens L1P, νdL1P: the Abbe number of the positive lens L1P, fGFP: the focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: the focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF, M_GFT: the lateral magnification of the focusing lens group GF at infinity focus at the long focal length end, M_GFRT: the combined lateral magnification of all lens groups arranged on the image side of the focusing lens group GF at infinity focus at the long focal length end (when the focusing lens group GF is the most on the image side, M_GFRT = 1).

4. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, and when zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, it has at least one lens group positioned on the image side of the focusing lens group GF, among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 positioned most on the image side, the positive lens component L1 has a positive lens L1P, it has a positive or negative lens component L2 positioned adjacent to the object side of the positive lens component L1, the lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, the focusing lens group GF has at least one negative lens and at least one positive lens, The first lens group G1 has at least two positive lenses and at least one negative lens, satisfies the following conditional expressions (1'), (2), and (8A), which is a zoom lens characterized by this. (1') 1.87 < NdL1P (2) 25 < νdL1P (8A) 0.1 < TLT / fT ≤ 0.90 However, NdL1P: refractive index of the positive lens L1P, νdL1P: Abbe number of the positive lens L1P, TLT: overall lens length at infinity focus at the long focal length end, fT: focal length of the entire system at infinity focus at the long focal length end.

5. It has a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group in order from the object side, during zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, it has at least one lens group located on the image side of the focusing lens group GF, among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, the positive lens component L1 has a positive lens L1P, it has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, the lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, the focusing lens group GF has at least one negative lens and at least one positive lens, the first lens group G1 has at least two positive lenses and at least one negative lens, satisfies the following conditional expressions (1'), (2), and (9A), which is a zoom lens characterized by this. (1') 1.87 < NdL1P (2) 25 < νdL1P (9A) 0.1 < f1 / fT < 0.7 However, NdL1P: refractive index of the positive lens L1P, νdL1P: Abbe number of the positive lens L1P, f1: focal length of the first lens group G1, fT: focal length of the entire system at infinity focus at the long focal length end.

6. It has a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group in order from the object side, When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, it has at least one lens group located on the image side of the focusing lens group GF, among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, the positive lens component L1 has a positive lens L1P, it has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, the lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, the focusing lens group GF has at least one negative lens and at least one positive lens, the first lens group G1 has at least two positive lenses and at least one negative lens, satisfies the following conditional expressions (1'), (2), (17A), characterized in that it is a zoom lens. (1') 1.87 < NdL1P (2) 25 < νdL1P (17A) 4.59 ≤ |(1 - M_GFT ２ ) × M_GFRT ２ | provided that, NdL1P: the refractive index of the positive lens L1P, νdL1P: the Abbe number of the positive lens L1P, M_GFT: the lateral magnification of the focusing lens group GF at infinity focus at the long focal length end, M_GFRT: the combined lateral magnification of all lens groups arranged on the image side of the focusing lens group GF at infinity focus at the long focal length end (when the focusing lens group GF is the most on the image side, M_GFRT = 1).

7. having, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, when zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, it has at least one lens group located on the image side of the focusing lens group GF, Among the positive refractive power lens groups included in the rear group, the positive refractive power lens group GFF disposed adjacent to the object side of the focusing lens group GF has a positive lens component L1 located on the most image side. The positive lens component L1 has a positive lens L1P. It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1. The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. The focusing lens group GF has at least one negative lens and at least one positive lens. Satisfies the following conditional expressions (1'), (2), (13A'). A zoom lens characterized by this. (1') 1.87 < NdL1P (2) 25 < νdL1P (13A') -2.92 ≤ fGFP / fGFN < -0.5 However, NdL1P: The refractive index of the positive lens L1P. νdL1P: The Abbe number of the positive lens L1P. fGFP: The focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF. fGFN: The focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF.

8. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power. Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance. It has at least one lens group located on the image side of the focusing lens group GF. Among the positive refractive power lens groups included in the rear group, the positive refractive power lens group GFF disposed adjacent to the object side of the focusing lens group GF has a positive lens component L1 located on the most image side. The positive lens component L1 has a positive lens L1P. It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1. The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. The focusing lens group GF has at least one negative lens and at least one positive lens. Satisfies the following conditional expressions (1'''), (2), (13A). A zoom lens characterized by this. (1''') 1.9 < NdL1P (2) 25 < νdL1P (13A) -4 < fGFP / fGFN < -0.5 However, NdL1P: Refractive index of the positive lens L1P; νdL1P: Abbe number of the positive lens L1P; fGFP: Focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF; fGFN: Focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF.

9. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, It has at least one lens group located on the image side of the focusing lens group GF, Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, The positive lens component L1 has a positive lens L1P, It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, The focusing lens group GF has at least one negative lens and at least one positive lens, The first lens group G1 has at least two positive lenses and at least one negative lens, Satisfying the following conditional expressions (1''') and (2), A zoom lens characterized by this. (1''') 1.9 < NdL1P (2) 25 < νdL1P However, NdL1P: Refractive index of the positive lens L1P; νdL1P: Abbe number of the positive lens L1P.

10. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, It has at least one lens group located on the image side of the focusing lens group GF, Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has the positive lens component L1 located most on the image side, The positive lens component L1 has a positive lens L1P, It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P, The focusing lens group GF has at least one negative lens and at least one positive lens, The first lens group G1 has at least two positive lenses and at least one negative lens, Satisfying the following conditional expressions (1), (3), (13A'), and (18), A zoom lens characterized by this. (1) 1.85 < NdL1P (3) -5 < fGFF / fGF < -0.7 (13A') -2.92 ≤ fGFP / fGFN < -0.5 (18) -10 < f1 / fN < -0.7 However, NdL1P: The refractive index of the positive lens L1P, fGFF: The focal length of the lens group GFF with positive refractive power, fGF: The focal length of the focusing lens group GF, fGFP: The focal length of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: The focal length of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF, f1: The focal length of the first lens group G1, fN: The focal length of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1.

11. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group, During zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes, The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a short distance, It has at least one lens group located on the image side of the focusing lens group GF, Among the positive refractive power lens groups included in the rear group, the positive refractive power lens group GFF disposed adjacent to the object side of the focusing lens group GF has a positive lens component L1 located on the most image side. The positive lens component L1 has a positive lens L1P. It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1. The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. The focusing lens group GF has at least one negative lens and at least one positive lens. The first lens group G1 has at least two positive lenses and at least one negative lens. Satisfies the following conditional expressions (1), (13A'), (14A), and (18). A zoom lens characterized by this. (1) 1.85 < NdL1P (13A') -2.92 ≤ fGFP / fGFN < -0.5 (14A) 0.2 < νdGFP / νdGFN < 0.6 (18) -10 < f1 / fN < -0.7 However, NdL1P: The refractive index of the positive lens L1P. fGFP: The focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF. fGFN: The focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF. νdGFP: The Abbe number of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF. νdGFN: The Abbe number of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF. f1: The focal length of the first lens group G1. fN: The focal length of the negative lens having the strongest refractive power among the negative lenses included in the first lens group G1.

12. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one negative refractive power lens group and at least one positive refractive power lens group. Among the negative refractive power lens groups included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side during focusing from infinity to a near distance. It has at least one lens group located on the image side of the focusing lens group GF. Among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power arranged adjacent to the object side of the focusing lens group GF has a positive lens component L1 located on the most image side. The positive lens component L1 has a positive lens L1P. It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1. The lens component L2 consists of a cemented lens of a negative lens L2N and a positive lens L2P. The focusing lens group GF has at least one negative lens and at least one positive lens. The first lens group G1 has at least two positive lenses and at least one negative lens. Satisfies the following conditional expressions (1'), (13A), (18), (21A). A zoom lens characterized by this. (1') 1.87 < NdL1P (13A) -4 < fGFP / fGFN < -0.5 (18) -10 < f1 / fN < -0.7 (21A) -10 < (D2RW - D2RT) / f2 ≤ -0.51 However, NdL1P: The refractive index of the positive lens L1P. fGFP: The focal length of the positive lens GFP with the smallest Abbe number among the positive lenses included in the focusing lens group GF. fGFN: The focal length of the negative lens GFN with the largest Abbe number among the negative lenses included in the focusing lens group GF. f1: The focal length of the first lens group G1. fN: The focal length of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1. f2: The focal length of the second lens group G2. D2RW: The distance on the optical axis from the most image-side refracting surface of the second lens group G2 to the most object-side refracting surface of the rear group at infinity focus at the short focal length end. D2RT: The distance on the optical axis from the most image-side refracting surface of the second lens group G2 to the most object-side refracting surface of the rear group at infinity focus at the long focal length end.

13. It has, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a rear group. When zooming from the short focal length end to the long focal length end, the interval between adjacent lens groups changes. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power. Among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is the focusing lens group GF that moves toward the image side when focusing from infinity to a short distance. It has at least one lens group located on the image side of the focusing lens group GF. Among the positive refractive power lens groups included in the rear group, the positive refractive power lens group GFF disposed adjacent to the object side of the focusing lens group GF has a positive lens component L1 located on the most image side, The positive lens component L1 has a positive lens L1P, It has a positive or negative lens component L2 located adjacent to the object side of the positive lens component L1, The lens component L2 is composed of a cemented lens of a negative lens L2N and a positive lens L2P, The focusing lens group GF has at least one negative lens and at least one positive lens, The first lens group G1 has at least two positive lenses and at least one negative lens, Satisfying the following conditional expressions (1'), (18), and (21A), A zoom lens characterized by this. (1') 1.87 < NdL1P (18) -10 < f1 / fN < -0.7 (21A) -10 < (D2RW - D2RT) / f2 ≤ -0.51 However, NdL1P: The refractive index of the positive lens L1P, f1: The focal length of the first lens group G1, fN: The focal length of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1, f2: The focal length of the second lens group G2, D2RW: The distance on the optical axis from the most image-side refractive surface of the second lens group G2 to the most object-side refractive surface of the rear group at infinity focus at the short focal length end, D2RT: The distance on the optical axis from the most image-side refractive surface of the second lens group G2 to the most object-side refractive surface of the rear group at infinity focus at the long focal length end.

14. Satisfying the following conditional expression (2), The zoom lens according to any one of Claims 10 to 13, characterized by this. (2) 25 < νdL1P However, νdL1P: The Abbe number of the positive lens L1P.

15. Satisfying the following conditional expression (3), The zoom lens according to any one of Claims 1 to 9 and Claims 11 to 14, characterized by this. (3) -5 < fGFF / fGF < -0.7 However, fGFF: The focal length of the positive refractive power lens group GFF, fGF: The focal length of the focusing lens group GF.

16. Satisfying the following conditional expression (4), The zoom lens according to any one of Claims 1 to 15, characterized by this. (4) 1.0 < NdL2N / NdL2P < 1.6 However, NdL2N: The refractive index of the negative lens L2N, NdL2P: The refractive index of the positive lens L2P.

17. Satisfying the following conditional expression (5), The zoom lens according to any one of claims 1 to 16, characterized in that... (5) 0.2 < νdL2N / νdL2P < 0.7 However, νdL2P: Abbe number of the positive lens L2P, νdL2N: Abbe number of the negative lens L2N.

18. Satisfying the following conditional expression (6), The zoom lens according to any one of claims 1 to 17, characterized in that... (6) 0.5 < fL1 / fGFF < 5 However, fL1: Focal length of the positive lens component L1, fGFF: Focal length of the lens group GFF with positive refractive power.

19. Satisfying the following conditional expression (7), The zoom lens according to any one of claims 1 to 18, characterized in that... (7) 0.5 < |fL2| / fL1 < 20 However, fL1: Focal length of the positive lens component L1, fL2: Focal length of the lens component L2.

20. Satisfying the following conditional expression (8), The zoom lens according to any one of claims 2, 3, 5 to 19, characterized in that... (8) 0.1 < TLT / fT < 0.95 However, TLT: Total lens length at infinity focus at the long focal length end, fT: Focal length of the entire system at infinity focus at the long focal length end.

21. Satisfying the following conditional expression (9), The zoom lens according to any one of claims 1, 3, 4, 6 to 20, characterized in that... (9) 0.1 < f1 / fT < 1 However, f1: Focal length of the first lens group, fT: Focal length of the entire system at infinity focus at the long focal length end.

22. Satisfying the following conditional expression (10), The zoom lens according to any one of claims 1 to 21, characterized in that... (10) 0.3 < f2 / fGF < 3.0 However, f2: Focal length of the second lens group, fGF: Focal length of the focusing lens group GF.

23. Satisfying the following conditional expression (11), The zoom lens according to any one of claims 1 to 22, characterized in that... (11) -8 < f1 / f2 < -2 However, f1: Focal length of the first lens group, f2: Focal length of the second lens group.

24. When varying the magnification from the short focal length end to the long focal length end, the position of the first lens group or the second lens group in the optical axis direction is fixed, The zoom lens according to any one of claims 1 to 23, characterized in that...

25. Satisfying the following conditional expression (12), The zoom lens according to any one of claims 1 to 24, characterized in that... (12) 35 < νdGFN However, νdGFN: Abbe number of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF.

26. Satisfying the following conditional expression (13), The zoom lens according to any one of Claims 4 to 6, Claim 9, and Claims 13 to 25, characterized in that. (13) -10 < fGFP / fGFN < -0.5 However, fGFP: Focal length of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF, fGFN: Focal length of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF.

27. Satisfying the following conditional expression (14), The zoom lens according to any one of Claims 1 to 10 and Claims 12 to 26, characterized in that. (14) 0.2 < νdGFP / νdGFN < 0.7 However, νdGFP: Abbe number of the positive lens GFP having the smallest Abbe number among the positive lenses included in the focusing lens group GF, νdGFN: Abbe number of the negative lens GFN having the largest Abbe number among the negative lenses included in the focusing lens group GF.

28. Satisfying the following conditional expression (15), The zoom lens according to any one of Claims 1 to 27, characterized in that. (15) 0.1 < DGFR'T / TLT < 0.5 However, TLT: Overall length of the lens at infinity focus at the long focal length end, DGFR'T: Distance on the optical axis from the most image-side refracting surface of the lens group GFF having positive refractive power at infinity focus at the long focal length end to the most object-side refracting surface of the lens group on the image side of the focusing lens group GF.

29. Satisfying the following conditional expression (16), The zoom lens according to any one of Claims 1 to 28, characterized in that. (16) |fGFR'T| / fGF < -1.5 However, fGFR'T: Composite focal length of the lens group on the image side of the focusing lens group GF at infinity focus at the long focal length end, fGF: Focal length of the focusing lens group GF.

30. A lens barrel having the zoom lens according to any one of Claims 1 to 29.

31. An imaging device having the zoom lens according to any one of Claims 1 to 29.

Images