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 technology]

[0002] Various types of zoom lenses for digital cameras have been known. Zoom lenses with extended focal lengths, particularly on the telephoto end, typically use a positive-lead zoom type, with the positive, negative, and rear groups (from the object side) in that order. Compact zoom lenses with high optical performance across the entire zoom and shooting distance range are required. To achieve fast autofocusing, an inner-focus system is known, in which a lens group located inside the heavy front lens is moved to reduce the weight of the focusing lens group. In particular, the rear-focus system, which uses a lens group closer to the image plane as the focusing lens group, which allows for a smaller lens outer diameter and is therefore lighter, has become increasingly popular in recent years.

[0003] However, with conventional rear-focusing systems, there was a problem of image quality deteriorating as the shooting distance changed due to significant changes in field curvature at the short focal length end and significant changes in spherical aberration and coma at the long focal length end. Lenses designed for high-speed AF, in particular, are often constructed with a small number of elements to further reduce the weight of the focusing lens group, but naturally, the fewer elements there are, the more difficult it is to suppress aberration fluctuations as the shooting distance changes. One method of reducing the weight of focusing lenses is to use glass materials with low specific gravity, but since low-specific-gravity glass materials generally have low refractive indices, this method weakens the effect of suppressing aberration fluctuations.

[0004] Patent Document 1 discloses a zoom lens with a five-group zoom lens configuration consisting 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 consisting, 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, for the purpose of reducing the weight of the focusing lens. In this zoom lens, the fifth lens group with negative refractive power moves toward the image side during focusing (the fifth lens group constitutes the focusing lens). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-015930 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the zoom lens of Patent Document 1 has room for improvement in terms of suppressing aberration fluctuations that accompany changes in 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 has as its object to provide a zoom lens, a lens barrel, and an imaging device that can suppress aberration fluctuations that accompany changes in the shooting distance. [Means for solving the problem]

[0008] The zoom lens of 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 lens group, the rear group has at least six lens groups;a distance between adjacent lens groups changes during zooming from the short focal length extremity to the long focal length extremity, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is a focusing lens group GF that moves toward the image side during focusing from infinity to a close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, the lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and satisfies the following conditional formula (1): 、(6A) The present invention is characterized in that: (1) 1.85 <NdL1P (6A)1 <fL1 / fGFF<5 however, NdL1P: refractive index of the positive lens L1P, fL1: the focal length of the positive lens component L1, fGFF: the focal length of the lens group GFF with positive refractive power, is. The zoom lens of 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. The rear group has at least six lens groups, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and of 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 moves toward the image side during focusing from the limit distance to a close distance, and includes at least one lens group located closer to the image side than the focusing lens group GF, and among the lens groups with positive refractive power included in the rear group, a lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and is characterized by satisfying the following conditional expressions (1) and (8): (1) 1.85 <NdL1P (8) 0.1 <TLT / fT<0.95 however, NdL1P: refractive index of the positive lens L1P, TLT: Total length of the lens when focused at infinity at the long focal length end. fT: focal length of the entire system when focused at infinity at the long focal length end, is. The zoom lens of 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. The rear group has at least six lens groups, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and of 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 moves toward the image side during focusing from the limit distance to a close distance, and includes at least one lens group located closer to the image side than the focusing lens group GF, and among the lens groups with positive refractive power included in the rear group, a lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and is characterized by satisfying the following conditional expressions (1) and (9): (1) 1.85 <NdL1P (9) 0.1 <f1 / fT<1 however, NdL1P: refractive index of the positive lens L1P, f1: focal length of the first lens group, fT: focal length of the entire system when focused at infinity at the long focal length end, is. The zoom lens of 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. The rear group has at least six lens groups, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and the lens group with the strongest negative refractive power among the lens groups with negative refractive power included in the rear group has a refractive power of infinity. The focusing lens group GF moves toward the image side during focusing from a long distance to a close distance, and includes at least one lens group located closer to the image side than the focusing lens group GF, and among the lens groups with positive refractive power included in the rear group, a lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and is characterized by satisfying the following conditional expressions (1) and (11): (1) 1.85 <NdL1P (11)-8 <f1 / f2<-2 however, NdL1P: refractive index of the positive lens L1P, f1: focal length of the first lens group, f2: the focal length of the second lens group, is. The zoom lens of 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. The rear group has at least six lens groups, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and the lens group with the strongest negative refractive power among the lens groups with negative refractive power included in the rear group has a refractive power of infinity. The focusing lens group GF moves toward the image side during focusing from a long distance to a close distance, and includes at least one lens group located closer to the image than the focusing lens group GF. Of the lens groups with positive refractive power included in the rear group, a lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and satisfies the following conditional expressions (1) and (17'): (1) 1.85 <NdL1P (17')3.5<|(1-M_GFT 2 )×M_GFRT 2 | however, NdL1P: refractive index of the positive lens L1P, M_GFT: The lateral magnification of the focusing lens group GF at the long focal length end when focusing on infinity, M_GFRT: the combined lateral magnification of all lens groups located on the image side of the focusing lens group GF when focusing at infinity at the long focal length extremity (when the focusing lens group GF is located closest to the image side, M_GFRT=1), is. The zoom lens of 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. The rear group has at least six lens groups, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and among the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power moves toward the image side when focusing from infinity to a close distance. the first lens group G1 has at least one lens group located closer to the image than the focusing lens group GF, and among the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image, and the positive lens component L1 has a positive lens L1P, and the first lens group G1 has at least two positive lenses and at least one negative lens, and satisfies the following conditional expressions (1) and (18): (1) 1.85 <NdL1P (18)-10 <f1 / fN<-0.7 however, NdL1P: refractive index of the positive lens L1P, f1: focal length of the first lens group G1, fN: focal length of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1, is. The zoom lens of 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, the rear group has at least six lens groups, and the spacing between adjacent lens groups changes during zooming from the short focal length extremity to the long focal length extremity, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and of 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 moves toward the image side during focusing from infinity to a close distance, and includes at least one lens group located closer to the image than the focusing lens group GF, and among the lens groups with positive refractive power included in the rear group, a lens group GFF with positive refractive power located adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, and the positive lens component L1 has a positive lens L1P, and satisfies the following conditional expression (1'): (1')1.87 <NdL1P however, NdL1P: refractive index of the positive lens L1P, is.

[0009] In another aspect, the zoom lens of this embodiment includes, 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, wherein the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity, the rear group includes at least one lens group with negative refractive power and at least one lens group with positive refractive power, the lens group with the strongest negative refractive power included in the rear group is a focusing lens group GF that moves toward the image side during focusing from infinity to a close distance, the zoom lens includes at least one lens group located closer to the image than the focusing lens group GF, and the lens group with positive refractive power that is located closest to the object side is a lens group GFRP that moves toward the object side during focusing from infinity to a close distance, the lens group GFRP includes only one positive lens, and satisfies the following conditional expressions (24) and (25): Note that "the lens group GFRP contains only one positive lens" includes not only the case where the lens group GFRP is composed of only one positive lens, but also the case where it contains one or more negative lenses in addition to the 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 of 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, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and of the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power has a negative refractive power when varying magnification from infinity to a close distance. The focusing lens group GF moves toward the image side during focusing, and 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 focusing lens group GF on the object side is made up 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, and the negative lens L2N and the negative lens L3N satisfy the following conditional expressions (27) and (28), respectively. (27)1.91 <NdL2N (28)1.91 <NdL3N however, NdL2N: refractive index of the negative lens L2N, NdL3N: refractive index of the negative lens L3N, is. [Effects 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 that occur with changes in the shooting distance. [Brief explanation of the drawings]

[0012] [Figure 1] 10A and 10B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 1. [Figure 2] 10A and 10B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 2. [Figure 3] 10A and 10B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 3. [Figure 4]10A and 10B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 4. [Figure 5] 10A and 10B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 5. [Figure 6] 13A and 13B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 6. [Figure 7] 13A and 13B are diagrams showing the movement locus of a zoom lens and the configuration of an image stabilization lens group and a focus lens group in Numerical Example 7. [Figure 8] FIG. 2 is a diagram showing the lens configuration of the zoom lens of Numerical Example 1 at the short focal length extremity when focusing on infinity. [Figure 9] 10A and 10B are longitudinal aberration diagrams of the zoom lens of Numerical Example 1 at the short focal length extremity when focused on infinity. [Figure 10] 10A and 10B are longitudinal aberration diagrams of the zoom lens of Numerical Example 1 at the long focal length extremity when focused on infinity. [Figure 11] 4A to 4C are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 1 at the short focal length extremity when focused on infinity. [Figure 12] 4A to 4C are diagrams illustrating lateral aberrations at the long focal length extremity of the zoom lens of Numerical Example 1 when focused on infinity. [Figure 13] 10A and 10B are longitudinal aberration diagrams of the zoom lens of Numerical Example 1 at the short focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 14] 10A and 10B are longitudinal aberration diagrams of the zoom lens of Numerical Example 1 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 15] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 1 at the short focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 16] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 1 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 17] FIG. 10 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 2 when focused on infinity at the short focal length extremity. [Figure 18]FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 2 when focused on infinity at the short focal length extremity. [Figure 19] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 2 at the long focal length extremity when focused on infinity. [Figure 20] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 2 at the short focal length extremity when focused on infinity. [Figure 21] 10A and 10B are diagrams illustrating lateral aberrations at the long focal length extremity of the zoom lens of Numerical Example 2 when focused on infinity. [Figure 22] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 2 at the short focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 23] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 2 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 24] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 2 at the short focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 25] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 2 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 26] FIG. 10 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 3 when focused on infinity at the short focal length extremity. [Figure 27] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 3 when focused on infinity at the short focal length extremity. [Figure 28] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 3 when focused on infinity at the long focal length extremity. [Figure 29] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 3 at the short focal length extremity when focused on infinity. [Figure 30] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 3 at the long focal length extremity when focused on infinity. [Figure 31] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 3 at the short focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 32] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 3 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 33] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 3 at the short focal length extremity when the object-to-image distance is in focus at 0.9 m. [Figure 34] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 3 at the long focal length extremity when the object-to-image distance is 0.9 m and in focus. [Figure 35] FIG. 10 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 4 at the short focal length extremity when focusing on infinity. [Figure 36] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 4 when focused on infinity at the short focal length extremity. [Figure 37] FIG. 11 is a longitudinal aberration diagram of the zoom lens of Numerical Example 4 at the long focal length extremity when focused on infinity. [Figure 38] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 4 at the short focal length extremity when focused on infinity. [Figure 39] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 4 at the long focal length extremity when focused on infinity. [Figure 40] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 4 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 41] FIG. 10 is a longitudinal aberration diagram of the zoom lens of Numerical Example 4 at the long focal length extremity when the object-to-image distance is 1.2 m and in focus. [Figure 42] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 4 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 43] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 4 at the long focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 44] FIG. 10 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 5 when focusing on infinity at the short focal length extremity. [Figure 45] FIG. 11 is a longitudinal aberration diagram of the zoom lens of Numerical Example 5 when focused on infinity at the short focal length extremity. [Figure 46] FIG. 11 is a longitudinal aberration diagram of the zoom lens of Numerical Example 5 at the long focal length extremity when focused on infinity. [Figure 47]10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 5 at the short focal length extremity when focused on infinity. [Figure 48] 10A and 10B are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 5 at the long focal length extremity when focused on infinity. [Figure 49] FIG. 11 is a longitudinal aberration diagram of the zoom lens of Numerical Example 5 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 50] FIG. 11 is a longitudinal aberration diagram of the zoom lens of Numerical Example 5 at the long focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 51] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 5 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 52] 10A to 10C are lateral aberration diagrams of the zoom lens of Numerical Example 5 at the long focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 53] FIG. 13 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 6 when focused on infinity at the short focal length extremity. [Figure 54] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 6 when focused on infinity at the short focal length extremity. [Figure 55] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 6 when focused on infinity at the long focal length extremity. [Figure 56] 13A to 13C are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 6 when focused on infinity at the short focal length extremity. [Figure 57] 13A to 13C are diagrams illustrating lateral aberrations of the zoom lens of Numerical Example 6 when focused on infinity at the long focal length extremity. [Figure 58] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 6 at the short focal length extremity when in focus with an object-to-image distance of 1.5 m. [Figure 59] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 6 at the long focal length extremity when in focus with an object-to-image distance of 1.5 m. [Figure 60] 13A to 13C are lateral aberration diagrams of the zoom lens of Numerical Example 6 at the short focal length extremity when in focus with an object-to-image distance of 1.5 m. [Figure 61]13A to 13C are lateral aberration diagrams of the zoom lens of Numerical Example 6 at the long focal length extremity when in focus with an object-to-image distance of 1.5 m. [Figure 62] FIG. 13 is a diagram showing the lens configuration of a zoom lens according to Numerical Example 7 when focused on infinity at the short focal length extremity. [Figure 63] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 7 when focused on infinity at the short focal length extremity. [Figure 64] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 7 when focused on infinity at the long focal length extremity. [Figure 65] FIG. 11 is a diagram illustrating lateral aberration of the zoom lens of Numerical Example 7 when focused on infinity at the short focal length extremity. [Figure 66] FIG. 11 is a diagram illustrating lateral aberration of the zoom lens of Numerical Example 7 at the long focal length extremity when focused on infinity. [Figure 67] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 7 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 68] FIG. 13 is a longitudinal aberration diagram of the zoom lens of Numerical Example 7 at the long focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 69] FIG. 11 is a lateral aberration diagram of the zoom lens of Numerical Example 7 at the short focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 70] FIG. 11 is a lateral aberration diagram of the zoom lens of Numerical Example 7 at the long focal length extremity when in focus with an object-to-image distance of 1.2 m. [Figure 71] FIG. 1 is a first diagram showing an example of an image capturing apparatus equipped with the zoom lens of the present embodiment. [Figure 72] FIG. 2 is a second diagram showing an example of an image capturing apparatus equipped with the zoom lens of the present embodiment. [Figure 73] 1 is a diagram showing an example of the external configuration of a lens barrel equipped with a zoom lens according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] First, the terms used in this specification are defined. In this specification, a "lens component" refers to a lens that has only two refracting surfaces, one on the object side and one on the image side, that come into contact with air in the normal optical path. For example, a single lens or a cemented lens corresponds to a "lens component." In this specification, "anti-vibration" refers to preventing image blur caused by lens shake during shooting, and an "anti-vibration lens" refers to 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 and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 1.

[0015] The zoom lens of Numerical Example 1 is composed of, 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the fifth lens group G5 and the image plane. The plane-parallel plate CG combines the functions of a low-pass filter, an infrared cut filter, and a cover glass for the image sensor.

[0016] When changing magnification from the short focal length extremity to the long focal length extremity, 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 relative to the image plane, while the second lens group G2 is fixed relative to the image plane. The third lens group G3 and the fifth lens group G5 move along the same locus, simplifying the mechanical configuration. In this way, the spacing between adjacent lens groups changes to change magnification.

[0017] The fourth lens group G4 is the lens group with the strongest negative refractive power among the rear groups, and constitutes the focusing lens group GF, which moves toward the image side during focusing from infinity to a close distance. The focusing lens group GF includes one positive lens GFP and one negative lens GFN (or may include 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 is one of the lens groups with positive refractive power included in the rear group, and constitutes the lens group GFF with positive refractive power, which is located adjacent to the focusing lens group GF (fourth lens group G4) on the object side. The lens group GFF with positive refractive power has a positive lens component L1 located closest to the image side, and a positive lens component L2 located adjacent to the positive lens component L1 on the object side. 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.

[0019] On the object side of the negative lens L2N, there are arranged, in order from the image side, a negative lens L3N, a positive lens L3P, and a positive lens L4P, and the negative lens L3N and the positive lens L3P are cemented together. Therefore, the lens group GFF can be configured, in order from the object side, to have 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. By adopting a configuration in which the lenses are arranged symmetrically in this way, aberrations can be corrected more effectively when the magnification is changed or the shooting distance is changed.

[0020] A part of the second lens group G2 (here, the first and second lenses of the six lenses) is an image stabilizing lens group that moves 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 and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 2.

[0022] The zoom lens of Numerical Example 2 is composed of, 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the sixth lens group G6 and the image plane.

[0023] When changing magnification from the short focal length extremity to the long focal length extremity, 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 relative to the image plane, while the second lens group G2 is fixed relative to the image plane. The fourth lens group G4 and the sixth lens group G6 move along the same locus, simplifying the mechanical configuration. In this way, the spacing between adjacent lens groups changes to change magnification.

[0024] The fifth lens group G5 is the lens group with the strongest negative refractive power among the rear groups, and constitutes the focusing lens group GF, which moves toward the image side during focusing from infinity to a close distance. The focusing lens group GF includes one positive lens GFP and one negative lens GFN (or may include 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 is one of the lens groups with positive refractive power included in the rear group, and constitutes the lens group GFF with positive refractive power, which is located adjacent to the focusing lens group GF (fifth lens group G5) on the object side. The lens group GFF with positive refractive power has a positive lens component L1 located closest to the image side, and a positive lens component L2 located adjacent to the positive lens component L1 on the object side. 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 the six lenses) is an image stabilizing lens group that moves in a direction perpendicular to the optical axis during image blur correction to enable image blur correction.

[0027] FIG. 3 is a diagram showing the movement locus of the zoom lens and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 3.

[0028] The zoom lens of Numerical Example 3 is composed of, 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 a "rear group." Between the third lens group G3 and the fourth lens group G4, an aperture stop SP for adjusting the amount of light is provided, which moves independently of each lens group. A parallel plane plate CG is provided between the seventh lens group G7 and the image plane.

[0029] When changing magnification from the short focal length extremity to the long focal length extremity, the first lens group G1, the third lens group G3, the sixth lens group G6, and the aperture stop SP move (extend) toward the object side relative to the image plane, the fourth lens group G4 moves toward the image side relative to the image plane, and the second lens group G2, the fifth lens group G5, and the seventh lens group G7 are fixed relative to the image plane. In this way, the spacing between adjacent lens groups changes, and magnification is changed.

[0030] The sixth lens group G6 is the lens group with the strongest negative refractive power among the rear groups, and constitutes the focusing lens group GF, which moves toward the image side when focusing from infinity to a close distance. The fourth lens group constitutes the focusing lens group, which moves toward the object side when focusing from infinity to a close distance. By employing this double focusing system, aberrations can be corrected more effectively when the shooting distance changes. The focusing lens group GF (sixth lens group G6) includes one positive lens GFP and one negative lens GFN (and one other 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 is one of the positive refractive power lens groups included in the rear group, and constitutes the positive refractive power lens group GFF, which is located adjacent to the focusing lens group GF (sixth lens group G6) on the object side. 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 positive lens component L1 on the object side. 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.

[0032] A part of the second lens group G2 (here, the third to fifth lenses out of the five lenses) is an image stabilizing lens group that moves in a direction perpendicular to the optical axis during image blur correction to enable image blur correction.

[0033] FIG. 4 is a diagram showing the movement locus of the zoom lens and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 4.

[0034] The zoom lens of Numerical Example 4 is composed of, 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A parallel plane plate CG is provided between the eighth lens group G8 and the image plane.

[0035] When varying magnification from the short focal length extremity to the long focal length extremity, 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 relative to the image plane, while the second lens group G2 remains fixed relative to the image plane. The third lens group G3 and the fifth lens group G5 move along the same locus, simplifying the mechanical configuration. In this way, the spacing between adjacent lens groups changes to vary magnification.

[0036] The sixth lens group G6 is the lens group with the strongest negative refractive power among the rear groups, and constitutes the focusing lens group GF, which moves toward the image side when focusing from infinity to a close distance. The fourth lens group constitutes the focusing lens group, which moves toward the object side when focusing from infinity to a close distance. By employing this double focusing system, aberrations can be corrected more effectively when the shooting distance changes. The focusing lens group GF (sixth lens group G6) includes a cemented lens consisting of one positive lens GFP and one negative lens GFN (or may include 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 is one of the positive refractive power lens groups included in the rear group, and constitutes the positive refractive power lens group GFF, which is located adjacent to the focusing lens group GF (sixth lens group G6) on the object side. 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 positive lens component L1 on the object side. 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 the five lenses) is an image stabilizing lens group that moves in a direction perpendicular to the optical axis during image blur correction to enable image blur correction.

[0039] FIG. 5 is a diagram showing the movement locus of the zoom lens and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 5.

[0040] The zoom lens of Numerical Example 5 is composed of, 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A parallel plane plate CG is provided between the eighth lens group G8 and the image plane.

[0041] When varying magnification from the short focal length extremity to the long focal length extremity, 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 relative to the image plane, while the second lens group G2 remains fixed relative to the image plane. The third lens group G3 and the fifth lens group G5 move along the same locus, simplifying the mechanical configuration. In this way, the spacing between adjacent lens groups changes to vary magnification.

[0042] The sixth lens group G6 is the lens group with the strongest negative refractive power among the rear groups, and constitutes the focusing lens group GF, which moves toward the image side when focusing from infinity to a close distance. The fourth lens group constitutes the focusing lens group, which moves toward the object side when focusing from infinity to a close distance. By employing this double focusing system, aberrations can be corrected more effectively when the shooting distance changes. The focusing lens group GF (sixth lens group G6) has a cemented lens consisting 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 in the focusing lens group GF. The negative lens GFN can be the negative lens with the largest Abbe number among the negative lenses in the focusing lens group GF.

[0043] The fifth lens group G5 is one of the positive refractive power lens groups included in the rear group, and constitutes the positive refractive power lens group GFF, which is located adjacent to the focusing lens group GF (sixth lens group G6) on the object side. 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 positive lens component L1 on the object side. 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.

[0044] A part of the second lens group G2 (here, the third to fifth lenses out of the five lenses) is an image stabilizing lens group that moves in a direction perpendicular to the optical axis during image blur correction to enable image blur correction.

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

[0046] The zoom lens of Numerical Example 6 is composed of, 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 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the third lens group G3 and the fourth lens group G4 (immediately after the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the sixth lens group G6 and the image plane.

[0047] When changing magnification from the short focal length extremity to the long focal length extremity, 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 relative to the image plane, while the second lens group G2 is fixed relative to the image plane. The fourth lens group G4 and the sixth lens group G6 move along the same locus, simplifying the mechanical configuration. In this way, the spacing between adjacent lens groups changes to change magnification.

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

[0049] The fourth lens group G4 is one of the lens groups with positive refractive power included in the rear group, and constitutes the lens group GFF with positive refractive power, which is located adjacent to the focusing lens group GF (fifth lens group G5) on the object side. The lens group GFF with positive refractive power has a positive lens component L1 located closest to the image side, and a positive lens component L2 located adjacent to the positive lens component L1 on the object side. 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 of the seven lenses) is an image stabilizing lens group that moves 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 and the configuration of the vibration reduction lens group and the focus lens group in Numerical Example 7.

[0052] The zoom lens of Numerical Example 7 is composed of, 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 a "rear group." A light-intensity adjusting aperture SP is provided between the second and third lenses of the fourth lens group G4, and moves integrally with the fourth lens group G4. A plane-parallel plate CG is provided between the seventh lens group G7 and the image plane.

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

[0054] The fifth lens group G5 has the strongest negative refractive power among the rear lens groups and constitutes the focusing lens group GF, which moves toward the image side during focusing from infinity to a close distance. The sixth lens group G6 has positive refractive power and is positioned closest to the object among the lens groups located closer to the image than the focusing lens group GF. It constitutes the focusing lens group GFRP, which moves toward the object side during focusing from infinity to a close distance. This double focusing system enables more effective aberration correction when the shooting distance changes. The focusing lens group GF (fifth lens group G5) includes a cemented lens consisting of one positive lens GFP and one negative lens GFN (or may include 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 (sixth lens group G6) includes one positive lens (positive lens 61G, described below).

[0055] The fourth lens group G4 is one of the lens groups with positive refractive power included in the rear group, and constitutes the lens group GFF with positive refractive power, which is located adjacent to the focusing lens group GF (fifth lens group G5) on the object side. The lens group GFF with positive refractive power has a positive lens component L1 located closest to the image side, and a positive lens component L2 located adjacent to the positive lens component L1 on the object side. 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.

[0056] A part of the fourth lens group G4 (here, the fourth to sixth lenses out of six lenses) is an image stabilizing lens group that moves in a direction perpendicular to the optical axis during image blur correction to enable image blur correction.

[0057] As a result of extensive research, the inventors discovered that in order to effectively suppress aberration fluctuations according to shooting distance, it is important not only to select the glass material of the focusing lens group itself and the configuration of the lens group, but also to select the glass material of the lens group adjacent to the focusing lens group and the configuration of the lens group, and this discovery led to the completion of the present invention.

[0058] Generally, glass materials with low refractive indexes are often low dispersion materials, which are effective in correcting chromatic aberration, but their low refractive index makes them disadvantageous in correcting spherical aberration and curvature of field.

[0059] In this embodiment, the lens group with the strongest negative refractive power in the rear group is designated as the focusing lens group GF, and a lens group GFF with positive refractive power is located on the object side of the focusing lens group GF. A high refractive index material is used for the positive lens L1P of the positive lens component L1 located closest to the image side of this lens group GFF with positive refractive power, thereby improving the effectiveness of aberration correction due to changes in shooting distance.

[0060] In particular, the lens group GFF with positive refractive power closest to the image plane is the position closest to the focusing lens group GF and has the largest axial pupil diameter, so it is preferable to use a positive lens L1P made of a high refractive index material at this position.Incidentally, in the zoom lens of Patent Document 1 mentioned above, all of the positive lenses used in the fourth lens group, which is located adjacent to the object side of the fifth lens group, which is the focusing lens group, have relatively low refractive indexes.

[0061] To summarize the above, the zoom lens of this embodiment includes, in order from the object side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, and a rear group, and the spacing between adjacent lens groups changes when varying magnification from the short focal length extremity to the long focal length extremity. The rear group includes at least one lens group with negative refractive power and at least one lens group with positive refractive power. Of the lens groups with negative refractive power included in the rear group, the lens group with the strongest negative refractive power is designated as the focusing lens group GF, which moves toward the image side during focusing from infinity to a close distance. Of the lens groups with positive refractive power included in the rear group, the lens group GFF with positive refractive power, which is located adjacent to the focusing lens group GF on the object side, includes a positive lens component L1 located closest to the image side, and the positive lens component L1 includes a positive lens L1P.

[0062] With the above lens configuration as a premise, the zoom lens of this 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 positive lens L1P, is.

[0063] By satisfying conditional expression (1), spherical aberration, coma, astigmatism, and other aberrations can be effectively corrected. In addition, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end that occur when the shooting distance changes can be effectively corrected. This effect can be more pronounced by satisfying conditional expressions (1'), (1"), and (1'''). If the lower limit of conditional expression (1) is exceeded, it becomes difficult to correct spherical aberration, coma, astigmatism, etc. In particular, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end become worse when the shooting distance changes.

[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 conditional expression (2), it is possible to suppress fluctuations in axial chromatic aberration that occur during zooming and focusing. This effect can be more pronounced by satisfying conditional expressions (2') and (2") If the lower limit of conditional expression (2) is exceeded, the fluctuation of axial chromatic aberration 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 positive power lens group GFF, fGF: focal length of the focusing lens group GF, is.

[0067] By satisfying conditional expression (3), high-speed autofocusing can be achieved by suppressing the amount of focus movement of the focusing lens group GF. Furthermore, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end can be effectively corrected when the shooting distance changes. This effect can be more pronounced by satisfying conditional expression (3'). If the upper limits of conditional expressions (3) and (3') are exceeded, the refractive power of the focusing lens group GF becomes too weak, the focus movement distance becomes large, and it becomes difficult to achieve high-speed AF. Also, the refractive power of the lens group GFF, which has positive refractive power, becomes too strong, and as the shooting distance changes, the curvature of field at the short focal length end and the spherical aberration and coma at the long focal length end become worse. If the lower limit of conditional expression (3) is exceeded, the refractive power of the focusing lens group GF becomes too strong, and the curvature of field at the short focal length end and the spherical aberration and coma at the long focal length end become worse when the shooting distance changes.

[0068] The zoom lens of this embodiment has a positive or negative lens component L2 located adjacent to the positive lens component L1 on the object side, and the lens component L2 is made of a cemented lens of a negative lens L2N and a positive lens L2P. In this case, the zoom lens of this embodiment preferably satisfies the following conditional expression (4), and more preferably 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 negative lens L2N, NdL2P: refractive index of positive lens L2P, is.

[0069] By satisfying conditional expression (4), spherical aberration can be appropriately corrected, and this effect can be more significantly achieved by satisfying conditional expression (4'). If the upper limit of conditional expression (4) is exceeded, the refractive index of the negative lens L2N becomes too high compared to the refractive index of the positive lens L2P, resulting in overcorrection of spherical aberration. If the lower limit of conditional expression (4) is exceeded, the refractive index of the negative lens L2N becomes too low compared to the refractive index of the positive lens L2P, resulting in insufficient correction of spherical aberration.

[0070] The zoom lens of this embodiment has a positive or negative lens component L2 located adjacent to the positive lens component L1 on the object side, and the lens component L2 is made of a cemented lens of a negative lens L2N and a positive lens L2P. In this case, the zoom lens of this embodiment preferably satisfies the following conditional expression (5), and more preferably 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 negative lens L2N, is.

[0071] By satisfying conditional expression (5), chromatic aberration can be appropriately corrected, and this effect can be more significantly achieved by satisfying conditional expression (5'). If the upper limit of conditional expression (5) is exceeded, the difference in Abbe number between the positive lens element L2P and the negative lens element L2N becomes too small, resulting in insufficient correction of chromatic aberration. If the lower limits of the conditions (5) and (5') are exceeded, the difference in Abbe number between the positive lens element L2P and the negative lens element L2N becomes too large, resulting in overcorrection of chromatic aberration.

[0072] The zoom lens of this embodiment preferably satisfies the following conditional expression (6), and more preferably 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 positive power lens group GFF, is.

[0073] By satisfying conditional expression (6), it is possible to effectively correct curvature of field at the short focal length extremity and spherical aberration and coma at the long focal length extremity when the shooting distance changes. This effect can be more pronounced by satisfying conditional expression (6'). If the upper limit of conditional expression (6) is exceeded, the refractive power of the positive lens component L1 becomes too weak, and the aberrations generated in the focusing lens group GF are undercorrected, resulting in aggravation of the curvature of field at the short focal length end and the spherical aberration and coma at the long focal length end as the shooting distance changes. If the lower limit of conditional expression (6) is exceeded, the refractive power of the positive lens component L1 becomes too strong, causing over-correction of aberrations occurring in the focusing lens group GF, and as a result, curvature of field at the short focal length extremity and spherical aberration and coma at the long focal length extremity become worse 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: focal length of the positive lens component L1, fL2: focal length of lens component L2, is.

[0075] By satisfying conditional expression (7), spherical aberration, coma, curvature of field, and chromatic aberration can be effectively corrected when the shooting distance changes. This effect can be more pronounced by satisfying conditional expression (7'). If the upper limit of conditional expression (7) is exceeded, the refractive power of the positive lens component L1 becomes too strong, causing the spherical aberration, coma, and curvature of field to fluctuate (become worse) when the shooting distance changes. If the lower limit of conditional expression (7) is exceeded, the refractive power of the lens component L2 becomes too strong, causing the spherical aberration, coma aberration, and chromatic aberration to fluctuate (become worse) when the shooting distance changes.

[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: Total length of the lens when focused at infinity at the long focal length end. fT: focal length of the entire system when focused at infinity at the long focal length end, is.

[0077] By satisfying conditional expression (8), the overall lens system can be made compact, and spherical aberration and coma, especially at the long focal length extremity, can be effectively corrected. This effect can be more pronounced by satisfying conditional expression (8'). If the upper limit of conditional expression (8) is exceeded, the overall lens system becomes large. If the lower limit of conditional expression (8) is exceeded, spherical aberration and coma, especially at the long focal length end, will worsen.

[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: focal length of the first lens group G1, fT: focal length of the entire system when focused at infinity at the long focal length end, is.

[0079] By satisfying conditional expression (9), the overall lens system can be made compact, and spherical aberration and coma, especially at the long focal length extremity, can be effectively corrected. This effect can be more pronounced by satisfying conditional expression (9'). If the upper limit of conditional expression (9) is exceeded, the overall lens system becomes large. If the lower limit of conditional expression (9) is exceeded, spherical aberration and coma, especially at the long focal length end, will worsen.

[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 focusing lens group GF, is.

[0081] By satisfying conditional expression (10), it is possible to suppress aberration fluctuations due to changes in shooting distance and aberration fluctuations during zooming. In particular, it is possible to effectively correct spherical aberration and coma at the long focal length extremity and astigmatism at the short focal length extremity. This effect can be more pronounced by satisfying conditional expression (10'). If the upper limit of conditional expression (10) is exceeded, the refractive power of the focusing lens group GF becomes too strong relative to that of the second lens group G2, causing aberration fluctuations due to changes in shooting distance to become large, making it particularly difficult to correct spherical aberration and coma at the long focal length extremity. If the lower limit of conditional expression (10) is exceeded, the refractive power of the second lens group G2 becomes too strong relative to the focusing lens group GF, resulting in large aberration fluctuations during zooming, making it particularly difficult to correct astigmatism at the short focal length extremity and spherical aberration at the long focal length extremity.

[0082] The zoom lens of this 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.

[0083] By satisfying conditional expression (11), it is possible to suppress aberration fluctuations during zooming and to effectively correct spherical aberration and coma at the long focal length extremity. Furthermore, it is possible to reduce the size of the entire lens system. This effect can be more pronounced by satisfying conditional expression (11'). If the upper limit of conditional expression (11) is exceeded, the refractive power of the first lens group G1 becomes too strong relative to that of the second lens group G2, making it difficult to correct spherical aberration and coma at the long focal length extremity. If the lower limit of conditional expression (11) is exceeded, the refractive power of the second lens group G2 becomes too strong relative to that of the first lens group G1, resulting in large aberration fluctuations during zooming, and the overall lens system becomes large.

[0084] In the zoom lens of this embodiment, the position of the first lens group G1 or the second lens group G2 is fixed in the optical axis direction when changing magnification from the short focal length extremity to the long focal length extremity. If the first lens group G1 or the second lens group G2 moves during zooming, it can cause decentering errors, which are a cause of coma aberrations, mainly at the long focal length extremity. By keeping the first lens group G1 or the second lens group G2 fixed during zooming, decentering errors can be suppressed, and coma aberrations, mainly at the long focal length extremity, can be effectively corrected.

[0085] In the zoom lens of this embodiment, the focusing lens group GF has at least one negative lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (12), and it is more preferable that the zoom lens of this embodiment 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), it is possible to suppress fluctuations in axial chromatic aberration caused by zooming and focusing. This effect can be more pronounced by satisfying conditional expression (12'). If the lower limit of conditional expression (12) is exceeded, the fluctuation of axial chromatic aberration due to zooming or focusing becomes large.

[0087] In the zoom lens of this embodiment, the focusing lens group GF has 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 the zoom lens of this embodiment satisfies the following conditional expression (13'): (13)-10 <fGFP / fGFN<-0.5 (13')-4 <fGFP / fGFN<-0.6 however, 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, is.

[0088] By satisfying conditional expression (13), it is possible to effectively correct curvature of field at the short focal length end and spherical aberration, coma, and chromatic aberration at the long focal length end when the shooting distance changes. Furthermore, it is possible to reduce the amount of focusing movement of the focusing lens group GF and achieve high-speed autofocus. This effect can be more pronounced by satisfying conditional expression (13'). If the upper limit of conditional expression (13) is exceeded, the refractive power of the negative lens element GFN becomes too weak, the focusing movement amount of the focusing lens element GF becomes large, and high-speed AF becomes difficult. Also, the refractive power of the positive lens element GFP becomes too strong, and as the shooting distance changes, the curvature of field at the short focal length end and the spherical aberration and coma at the long focal length end become worse. If the lower limit of conditional expression (13) is exceeded, the refractive power of the negative lens GFN becomes too strong, and the curvature of field at the short focal length end and the spherical aberration, coma, and chromatic aberration at the long focal length end become worse when the shooting distance changes.

[0089] In the zoom lens of this embodiment, the focusing lens group GF has 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 the zoom lens of this embodiment 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 having the largest Abbe number among the negative lenses included in the focusing lens group GF, is.

[0090] By satisfying conditional expression (14), chromatic aberration can be appropriately corrected, and this effect can be more significantly achieved by satisfying conditional expression (14'). If the upper limit of conditional expression (14) is exceeded, 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. If the lower limit of conditional expression (14) is exceeded, 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 closer to the image than the focusing lens group GF. Because the pupil diameter is smaller on the image side than the focusing lens group GF, it is less susceptible to the effects of spherical aberration and coma. As a result, the lens group closer to the image than the focusing lens group GF can be specialized for correcting field curvature, chromatic aberration of magnification, and other aberrations.

[0092] The zoom lens of this embodiment has at least one lens group located closer to the image side than the focusing lens group GF. In this case, the zoom lens of this embodiment preferably 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: Total length of the lens when focused at infinity at the long focal length end. DGFRT: The distance on the optical axis from the refractive surface closest to the image of the lens group GFF with positive refractive power when focusing at infinity at the long focal length extremity to the refractive surface closest to the object of the lens group on the image side of the focusing lens group GF. is.

[0093] By satisfying conditional expression (15), it is possible to suppress aberration fluctuations due to changes in shooting distance. In particular, it is possible to effectively correct curvature of field at the short focal length extremity and spherical aberration and coma at the long focal length extremity. Furthermore, it is possible to reduce the amount of focusing movement of the focusing lens group GF and achieve high-speed autofocus. This effect can be more significantly achieved by satisfying conditional expression (15'). If the upper limit of conditional expression (15) is exceeded, the overall lens length at the long focal length extremity will become too long, and if an attempt is made to forcibly shorten the overall lens length, the refractive power of the focusing lens group GF will have to be increased, resulting in greater aberration fluctuations due to changes in shooting distance. In particular, it will become difficult to correct curvature of field at the short focal length extremity and spherical aberration and coma at the long focal length extremity. If the lower limits of the conditions (15) and (15') are exceeded, the amount of focusing movement of the focusing lens group GF becomes too large, making it difficult to achieve high-speed AF.

[0094] The zoom lens of this embodiment has at least one lens group located closer to the image side than the focusing lens group GF. In this case, the zoom lens of this embodiment preferably satisfies the following conditional expression (16), and more preferably satisfies the following conditional expression (16'): (16)|fGFRT| / fGF<-1.5 (16')-1000<|fGFRT| / fGF<-2 however, fGFRT: the composite focal length of the lens group located closer to the image than the focusing lens group GF when focusing at infinity at the long focal length end, fGF: focal length of the focusing lens group GF, is.

[0095] By satisfying conditional expression (16), it is possible to effectively correct aberration fluctuations due to changes in shooting distance. In particular, it is possible to effectively correct spherical aberrations and coma at the long focal length extremity. This effect can be more pronounced by satisfying conditional expression (16'). Furthermore, by satisfying conditional expression (16'), it is possible to effectively correct aberration fluctuations during zooming and when the shooting distance changes. In particular, it is possible to effectively correct off-axis aberrations such as coma and field curvature. If the upper limit of condition (16) is exceeded, the refractive power of the lens group closer to the image side than the focusing lens group GF becomes too strong, resulting in large aberration fluctuations during zooming or when the shooting distance changes, making it particularly difficult to correct off-axis aberrations such as coma and curvature of field. If the lower limit of condition (16') is exceeded, the refractive power of the focusing lens group GF becomes too strong, causing aberration fluctuations with changes in shooting distance to become large, making it particularly difficult to correct spherical aberration and coma at the long focal length extremity.

[0096] In the zoom lens of this embodiment, it is preferable that the distance between the focusing lens group GF and the lens groups adjacent to it before and after it changes when changing magnification from the short focal length extremity to the long focal length extremity. The focusing lens group GF also functions as a compensator during zooming, and because the pupil diameter of the focusing lens group GF is small, its effect on spherical aberration is small, making it possible to effectively suppress fluctuations in field curvature during zooming.

[0097] The zoom lens of this 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 the long focal length end when focusing on infinity, M_GFRT: the combined lateral magnification of all lens groups located on the image side of the focusing lens group GF when focusing at infinity at the long focal length extremity (when the focusing lens group GF is located closest to the image side, M_GFRT=1), is.

[0098] Conditions (17) and (17') define the focusing sensitivity of the focusing lens group GF, and by satisfying condition (17), the maximum imaging magnification can be ensured, the amount of focusing movement of the focusing lens group GF can be suppressed, high-speed autofocusing can be achieved, and the overall lens system can be made compact. This effect can be more pronounced by satisfying condition (17'). If the lower limit of conditional expression (17) is exceeded, the focusing sensitivity of the focusing lens group GF becomes too weak, the minimum shooting distance becomes long, and the maximum magnification becomes low. Alternatively, the focusing movement of the focusing lens group GF increases, slowing down the AF speed and increasing the overall lens length.

[0099] The first lens group G1 preferably includes one negative lens and two positive lenses. At the long focal length end (telephoto end), aberrations increase, particularly spherical aberration, coma, and chromatic aberration. The positive lens in the first lens group G1 is made of a low-refractive-index, low-dispersion material to correct chromatic aberration. In this case, however, a single positive lens increases spherical aberration and coma, making it difficult to extend the focal length at the long focal length end (telephoto end). For this reason, it is preferable to include at least two positive lenses in the first lens group G1. Furthermore, to offset aberrations generated by the positive lens, it is necessary to include at least one negative lens in the first lens group G1.

[0100] In the zoom lens of this embodiment, the first lens group G1 has at least one negative lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (18), and it is more preferable that the zoom lens of this embodiment 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 with the strongest refractive power among the negative lenses included in the first lens group G1, is.

[0101] By satisfying conditional expression (18), spherical aberration, coma, astigmatism, and chromatic aberration can be corrected well. This effect can be more significantly obtained by satisfying conditional expression (18'). If the upper limit of conditional expression (18) is exceeded, the power of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1 will become too weak, making it difficult to correct spherical aberration, coma, and chromatic aberration. If the lower limit of conditional expression (18) is exceeded, the power of the negative lens with the strongest refractive power among the negative lenses included in the first lens group G1 will become too strong, making it difficult to correct spherical aberration, coma, astigmatism, and chromatic aberration throughout the entire zoom range.

[0102] The zoom lens of this 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 when focused at infinity at the short focal length end, ft: focal length of the entire system when focused at infinity at the long focal length end, is.

[0103] By satisfying conditional expression (19), a desired zoom ratio can be ensured and the overall lens system can be made compact. Furthermore, spherical aberration, coma, astigmatism, axial chromatic aberration, lateral chromatic aberration, and other aberrations can be effectively corrected, particularly at the long focal length end (telephoto end). This effect can be more pronounced by satisfying conditional expression (19'). If the upper limit of conditional expression (19) is exceeded, the refractive power of the first lens group G1 becomes too weak, resulting in a decrease in the zoom ratio or an increase in the size of the entire lens system. If the lower limit of conditional expression (19) is exceeded, the refractive power of the first lens group G1 becomes too strong, making it difficult to correct spherical aberration, coma, astigmatism, axial chromatic aberration, chromatic aberration of magnification, and the like, particularly on the long focal length end side (telephoto side).

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

[0105] By satisfying conditional expression (20), it is possible to ensure a sufficient zoom ratio while miniaturizing the entire lens system, and also to effectively correct fluctuations in various aberrations during zooming. If the upper limit of conditional expression (20) is exceeded, the amount of change in the distance between the first lens group G1 and the second lens group G2 during zooming becomes too large, and the distance between the first lens group G1 and the second lens group G2 becomes too wide at the long focal length end (telephoto end), resulting in an increase in the size of the entire lens system. If the lower limit of conditional expression (20) is exceeded, the amount of change in the distance between the first lens group G1 and the second lens group G2 during zooming becomes too small, resulting in a small zoom ratio (unable to ensure a sufficient zoom ratio). Furthermore, if one tries to forcibly obtain a desired zoom ratio, the refractive power of the first lens group G1 or the second lens group G2 must be increased, which increases the fluctuations in various aberrations during zooming.

[0106] It is preferable that the zoom lens of this embodiment satisfies the following conditional expression (21). (21)-10<(D2RW-D2RT) / f2<-0.1 however, f2: focal length of the second lens group G2, D2RW: The distance on the optical axis from the refractive surface of the second lens group G2 closest to the image to the refractive surface of the rear group closest to the object when focusing at infinity at the short focal length extremity. D2RT: The distance on the optical axis from the refractive surface of the second lens group G2 closest to the image to the refractive surface of the rear group closest to the object when focusing at infinity at the long focal length end. is.

[0107] By satisfying conditional expression (21), it is possible to ensure a sufficient zoom ratio while miniaturizing the entire lens system, and also to effectively correct fluctuations in various aberrations during zooming. If the upper limit of 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 side (wide angle side), and the overall lens system becomes large. If the lower limit of 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, resulting in a small zoom ratio (unable to ensure a sufficient zoom ratio). Also, if one tries to forcibly obtain a desired zoom ratio, the refractive power of the second lens group G2 or the rear group (third lens group G3) must be increased, which results in large fluctuations in various aberrations during zooming.

[0108] The zoom lens of this 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 at the long focal length end when focusing on infinity, M2W: lateral magnification of the second lens group G2 when focusing at infinity at the short focal length end, is.

[0109] Conditions (22) and (22') define the magnification load borne by the second lens group G2. By satisfying condition (22), it is possible to obtain a desired magnification ratio while effectively correcting spherical aberration, coma, astigmatism fluctuations, and the like during zooming. This effect can be more pronounced by satisfying condition (22'). If the upper limit of conditional expression (22) is exceeded, the magnification load on the second lens group G2 decreases, and the refractive power of the other lens groups must be strengthened to obtain the desired magnification ratio, which makes it difficult to correct spherical aberration, coma, astigmatism fluctuations, and the like during zooming. If the lower limit of conditional expression (22) is exceeded, the burden of the second lens group G2 on magnification increases, making it difficult to correct spherical aberration, coma, astigmatism fluctuations, and the like during zooming.

[0110] In the zoom lens of this embodiment, the inclusion of an anti-vibration lens group makes it possible to correct image blur that occurs in a captured image due to camera shake or the like. Given camera shake of the same angle, the longer the focal length, the greater the image blur. Therefore, it is desirable for a lens with a long focal length at the long focal length end (telephoto end) to be able to correct image blur more effectively. However, a larger anti-vibration lens group unit results in an increase in the size of the lens. Furthermore, if the weight of the anti-vibration lens group itself becomes heavy, it is desirable for the anti-vibration lens group to be small and lightweight in order to drive the heavy anti-vibration lens group.

[0111] Furthermore, it is preferable that the vibration-reduction lens group be included in a lens group whose position in the optical axis direction is fixed during zooming (in the example of this embodiment, this is the second lens group G2 or the fourth lens group G4). Generally, a vibration-reduction lens group is provided with a drive mechanism (including mechanical members, magnets, coils, electrical components, etc.; hereinafter referred to as the "vibration-reduction drive mechanism") for moving the vibration-reduction lens group in a direction approximately perpendicular to the optical axis, located on the outer periphery of the lens to be driven. If the vibration-reduction lens group were configured to move during zooming, an additional zoom movement mechanism and lens barrel would be required in the outer periphery direction, which would increase the outer diameter of the lens. However, by fixing a lens group including the vibration-reduction lens group during zooming, as in the zoom lens of this embodiment, it is possible to prevent the zoom movement mechanism and lens barrel from becoming larger in size in the outer periphery direction.

[0112] The zoom lens system of this embodiment has a vibration reduction lens group closer to the object side than the focusing lens group GF. In this case, it is preferable that the zoom lens system of this embodiment satisfies the following conditional expression (23), and it is more preferable that the zoom lens system of this embodiment 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 the long focal length end when focusing on infinity, M_VRT: The combined lateral magnification of all lens groups on the image side of the vibration-proof lens group when focusing at infinity at the long focal length end. is.

[0113] By satisfying conditional expression (23), it is possible to obtain the desired vibration reduction effect while favorably correcting decentering aberrations during vibration reduction drive. Furthermore, it is possible to reduce the size of the vibration reduction lens group and, ultimately, the vibration reduction drive unit. This effect can be more pronounced by satisfying conditional expression (23'). If the upper limit of conditional expression (23) is exceeded, the refractive power of the vibration-reduction lens group becomes too strong, and decentering aberrations increase during vibration-reduction drive. If the lower limit of condition (23) is exceeded, the vibration-reduction sensitivity of the vibration-reduction lens group becomes too weak, making it impossible to obtain the desired vibration-reduction effect, or the vibration-reduction lens group and therefore the vibration-reduction drive unit become too large.

[0114] In another aspect (e.g., Numerical Example 7 described later), the zoom lens of this embodiment includes, 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. The spacing between adjacent lens groups changes when zooming from the short focal length extremity to the long focal length extremity, and the rear group includes 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, which moves toward the image side during focusing from infinity to a close distance. The rear group includes at least one lens group located closer to the image than the focusing lens group GF, and the lens group with positive refractive power located closest to the object side is the lens group GFRP, which moves toward the object side during focusing from infinity to a close distance. The lens group GFRP includes only one positive lens, and the following conditional expressions (24) and (25) can be satisfied. (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.

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

[0116] In other words, the zoom lens of this embodiment has at least one lens group located closer to the image side than the focusing lens group GF, and the lens group having positive refractive power located closest to the object side among these lens groups is a lens group GFRP that moves towards the object side during focusing from infinity to a close distance, and the lens group GFRP includes only one positive lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (24), and it is more preferable that the zoom lens of this embodiment 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 this embodiment can have a lens group GFRP that moves during focusing in addition to the focusing lens group GF. By employing such a double focusing system, aberrations can be corrected more effectively when the shooting distance changes. In particular, the lens group GFRP, which has positive refractive power and is located adjacent to the focusing lens group GF on the image side, has a relatively small outer diameter and is lightweight, is capable of high-speed autofocusing, and can be constructed with a relatively small number of lenses. Furthermore, by satisfying conditional expression (24), fluctuations in axial chromatic aberration and lateral chromatic aberration due to zooming and focusing can be suppressed. This effect can be more significantly obtained by satisfying conditional expression (24'). If the upper limit of conditional expression (24) is exceeded, fluctuations in axial chromatic aberration and lateral chromatic aberration due to zooming and focusing will be overcorrected. If the lower limit of condition (24) is exceeded, the fluctuations in axial chromatic aberration and lateral chromatic aberration due to zooming and focusing will become large.

[0118] Furthermore, the zoom lens of this embodiment has at least one lens group located closer to the image than the focusing lens group GF, and the lens group having positive refractive power located closest to the object among these lens groups is a lens group GFRP that moves towards the object during focusing from infinity to a close distance, and the lens group GFRP includes only one positive lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (25), and it is more preferable that the zoom lens of this embodiment satisfies 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.

[0119] By satisfying conditional expression (25), spherical aberration, coma, astigmatism, and the like can be effectively corrected. Furthermore, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end that occur when the shooting distance changes can be effectively corrected. This effect can be more pronounced by satisfying conditional expression (25'). If the lower limit of conditional expression (25) is exceeded, it becomes difficult to correct spherical aberration, coma, astigmatism, etc. In particular, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end become worse when the shooting distance changes.

[0120] Furthermore, the zoom lens of this embodiment has at least one lens group located closer to the image than the focusing lens group GF, and the lens group having positive refractive power located closest to the object among these lens groups is a lens group GFRP that moves towards the object during focusing from infinity to a close distance, and the lens group GFRP includes only one positive lens. In this case, it is preferable that the zoom lens of this embodiment satisfies the following conditional expression (26), and it is more preferable that the zoom lens of this embodiment satisfies 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 lens group GFRP, is.

[0121] By satisfying conditional expression (26), spherical aberration, coma, astigmatism, and the like can be effectively corrected. Furthermore, curvature of field at the short focal length end and spherical aberration and coma at the long focal length end that occur when the shooting distance changes can be effectively corrected. This effect can be more pronounced by satisfying conditional expression (26'). If the upper limit of conditional expression (26) is exceeded, the refractive power of the GFRP lens group becomes too strong, making it difficult to correct spherical aberration, coma, astigmatism, etc. In particular, spherical aberration and coma at the long focal length end become worse as the shooting distance changes. If the lower limit of condition (26) is exceeded, the refractive power of the GFRP lens unit becomes too weak, making it difficult to correct spherical aberration, coma, astigmatism, etc. In particular, the curvature of field at the short focal length end becomes worse when the shooting distance changes.

[0122] In another aspect (for example, Numerical Example 1 described later), the zoom lens of 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, and the spacing between adjacent lens groups changes during zooming from the short focal length extremity to the long focal length extremity, the rear group has at least one lens group with negative refractive power and at least one lens group with positive refractive power, and of 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 moves toward the image side during focusing from the limit distance to a close distance, and 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 focusing lens group GF on the object side 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, and the negative lens L2N and the negative lens L3N are capable of satisfying 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.

[0123] As described above, in the zoom lens of this 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 focusing lens group GF on the object side can be configured, in order from the object side, as follows: 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. By adopting such a configuration in which the lenses are symmetrically arranged, aberrations can be corrected more effectively when changing magnification or changing the shooting distance. This is particularly effective for off-axis aberrations such as coma and astigmatism. Furthermore, because this configuration maintains a fixed spacing between the negative lens L3N and the negative lens L2N during zooming, aberrations due to decentering that occur when changing magnification can be suppressed.

[0124] With the above lens configuration as a premise, it is preferable that the zoom lens of this embodiment satisfies the following conditional expressions (27) and (28), and it is more preferable that the following conditional expressions (27'), (27"), (28'), and (28") be satisfied. (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.

[0125] By satisfying conditional expression (27), spherical aberration, coma, and other aberrations can be effectively corrected throughout the entire zoom range. Furthermore, fluctuations in spherical aberration and coma that occur when the shooting distance changes can be effectively corrected. This effect can be more pronounced by satisfying conditional expressions (27') and (27") If the lower limit of condition (27) is exceeded, it becomes difficult to correct spherical aberration, coma, and the like over the entire zoom range, and the spherical aberration and coma aberration worsen when the shooting distance changes.

[0126] By satisfying conditional expression (28), spherical aberration, coma, and other aberrations can be effectively corrected throughout the entire zoom range. Furthermore, fluctuations in spherical aberration and coma that occur when the shooting distance changes can be effectively corrected. This effect can be more pronounced by satisfying conditional expressions (28') and (28") If the lower limit of condition (28) is exceeded, it becomes difficult to correct spherical aberration, coma, and the like over the entire zoom range, and the spherical aberration and coma aberration worsen when the shooting distance changes.

[0127] In the zoom lens of this embodiment, it is assumed that the lens group GFF is configured in order from the object side 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, and it is preferable that the following conditional expression (29) be satisfied, and it is more preferable that the following conditional expressions (29') and (29") be satisfied: (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 refractive surface closest to the object to the refractive surface closest to the image in the lens group GFF. is.

[0128] By satisfying conditional expression (29), the overall lens length can be shortened and coma can be corrected satisfactorily over the entire zoom range. If the upper limit of conditional expression (29) is exceeded, the thickness of the lens group GFF in the optical axis direction becomes too large, increasing the overall lens length, which in turn requires increasing the lens diameter to increase the amount of peripheral illumination of off-axial light, making it difficult to correct coma. If the lower limit of condition (29) is exceeded, it becomes difficult to correct coma over the entire zoom range.

[0129] In the zoom lens of this embodiment, it is assumed that the lens group GFF is configured in order from the object side 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, and it is preferable that the following conditional expression (30) be satisfied, and it is more preferable that the following conditional expressions (30') and (30") be satisfied: (30)0.7 <fGFFA<fGFFB<1.5 (30')0.75 <fGFFA<fGFFB<1.3 (30”) 0.8 <fGFFA<fGFFB<1.2 however, fGFFA: composite focal length of positive lens L4P, positive lens L3P, and negative lens L3N, fGFFB: composite focal length of negative lens L2N, positive lens L2P, and positive lens L1P, is.

[0130] By satisfying conditional expression (30), spherical aberration, coma, astigmatism, and the like can be corrected satisfactorily over the entire zoom range. If the upper limit of conditional expression (30) is exceeded, the symmetry of the refractive power of the lens group GFF is lost, making it difficult to correct spherical aberration, coma, astigmatism, and the like. If the lower limit of condition (30) is exceeded, the symmetry of the refractive power of the lens group GFF is lost, and it becomes difficult to correct spherical aberration, coma, astigmatism, and the like.

[0131] Specific numerical examples 1-7 are shown below. In the longitudinal and lateral aberration diagrams and tables, the d-line, g-line, and C-line aberrations correspond to the respective wavelengths, S indicates sagittal aberration, M indicates meridional aberration, FNO. indicates F-number, f indicates focal length, W indicates half angle of view, Y indicates image height, BF indicates back focus, L indicates total lens length, R indicates radius of curvature, D indicates lens thickness or lens spacing, N(d) indicates refractive index for the d-line, and ν(d) indicates Abbe number for the d-line. Back focus is the distance from the surface closest to the image in the entire lens system to the designed image plane. The total lens length and back focus indicate the air-equivalent length between the surface closest to the image in the entire lens system and the designed image plane, excluding a cover glass or the like. The F-number, focal length, magnification, half angle of view, image height, back focus, total lens length, and lens spacing D, which changes with zooming and focusing, are listed in the following order: short focal length end, intermediate focal length, and long focal length end. The units of length are [mm]. A rotationally symmetric aspheric 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] FIGS. 8 to 16 and Tables 1 to 3 show the zoom lens of Numerical Example 1. FIG. 8 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 9 and 10 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 11 and 12 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 13 and 14 show longitudinal aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. FIGS. 15 and 16 show lateral aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. Table 1 shows surface data, Table 2 shows various data, and Table 3 shows 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 (a lens group GFF with positive refractive power), a fourth lens group G4 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the fifth lens group G5 and the image plane.

[0134] The first lens group G1 is composed of, in order from the object side, a positive meniscus lens 11A convex toward the object side, a negative meniscus lens 12A convex toward the object side, and a positive meniscus lens 13A convex toward the object side. The negative meniscus lens 12A and the positive meniscus lens 13A are cemented 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 toward the object side, a biconvex positive lens 23A, a negative meniscus lens 24A convex toward the object side, a positive meniscus lens 25A convex toward the object side, and a negative meniscus lens 26A convex toward the image side. The negative meniscus lens 24A and the positive meniscus lens 25A are cemented 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 toward the image side, a negative meniscus lens 34A (negative lens L2N) convex toward 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 cemented together. The negative meniscus lens 34A (negative lens L2N) and the biconvex positive lens 35A (positive lens L2P) are cemented together to form a positive lens component L2. The biconvex positive lens 36A (positive lens L1P) forms a 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 cemented together.

[0139] (Table 1) [Face Data] Zoom ratio 4.04 Surface number RDN(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 aperture 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 Near distance (object distance 0.9m) Wide-angle Mid-telephoto Wide-angle Mid-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 Multiplier 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 plane 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] FIGS. 17 to 25 and Tables 4 to 6 show the zoom lens of Numerical Example 2. FIG. 17 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 18 and 19 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 20 and 21 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 22 and 23 show longitudinal aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. FIGS. 24 and 25 show lateral aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. Table 4 shows surface data, Table 5 shows various data, and Table 6 shows zoom lens group data.

[0141] The zoom lens of Numerical Example 2 is composed of, 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 lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the sixth lens group G6 and the image plane.

[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 toward the object side, and a positive meniscus lens 13B convex toward the object side. The negative meniscus lens 12B and the positive meniscus lens 13B are cemented together.

[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 toward the object side, a plano-convex positive lens 23B convex toward the image side, a biconcave negative lens 24B, a positive meniscus lens 25B convex toward the object side, and a negative meniscus lens 26B convex toward the image side. The biconcave negative lens 24B and the positive meniscus lens 25B are cemented together.

[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 that is convex toward the image side. The biconvex positive lens 32B and the negative meniscus lens 33B are cemented together.

[0145] The fourth lens group G4 is composed of, in order from the object side, a negative meniscus lens 41B (negative lens L2N) convex toward the object side, a biconvex positive lens 42B (positive lens L2P), and a positive meniscus lens 43B (positive lens L1P) convex toward the object side. The negative meniscus lens 41B (negative lens L2N) and the biconvex positive lens 42B (positive lens L2P) are cemented together to form a positive lens component L2. The positive meniscus lens 43B (positive lens L1P) forms 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 toward the image side, and a biconvex positive lens 62B.

[0148] (Table 4) [Face Data] Zoom ratio 4.05 Surface number RDN(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-inch INFINITY 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 INFINITY 1.500 1.51633 64.1 37 INFINITY - (Table 5) [Various items] Infinite distance (distance between object and image 0.9m) Looking into the distance from the middle of the wide-angled viewpoint 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 Multiplier 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 plane 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 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 27 and 28 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 29 and 30 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 31 and 32 show longitudinal aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. FIGS. 33 and 34 show lateral aberration diagrams when focusing on an object-to-image distance of 0.9 m at the short focal length extremity and the long focal length extremity. Table 7 shows surface data, Table 8 shows various data, and Table 9 shows zoom lens group data.

[0150] The zoom lens of Numerical Example 3 is composed of, 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 lens group GFF with positive refractive power), a sixth lens group G6 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the third lens group G3 and the fourth lens group G4, and moves independently of each lens group. A parallel plane plate CG is provided between the seventh lens group G7 and the image plane.

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

[0152] The second lens group G2 is composed of, in order from the object side, a negative meniscus lens 21C convex toward 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 toward the object side. The biconcave negative lens 24C and the positive meniscus lens 25C are cemented 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 that is convex toward the image side. The biconvex positive lens 32C and the negative meniscus lens 33C are cemented together.

[0154] The fourth lens group G4 is composed of a cemented lens consisting of a biconcave negative lens 41C and a biconvex positive lens 42C, positioned in this 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 toward the image side, and a positive meniscus lens 54C (positive lens L1P) convex toward the object side. The biconvex positive lens 52C (positive lens L2P) and the negative meniscus lens 53C (negative lens L2N) are cemented together to form a negative lens component L2. The positive meniscus lens 54C (positive lens L1P) forms 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 toward 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) [Face Data] Zoom ratio 3.77 Surface number RDN(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 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 Near distance (object distance 0.9m) Wide-angle Mid-telephoto Wide-angle Mid-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 Multiplier 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 plane 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] FIGS. 35 to 43 and Tables 10 to 13 show the zoom lens of Numerical Example 4. FIG. 35 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 36 and 37 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 38 and 39 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 40 and 41 show longitudinal aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. FIGS. 42 and 43 show lateral aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. Table 10 shows surface data, Table 11 shows various data, Table 12 shows zoom lens group data, and Table 13 shows aspherical surface data.

[0160] The zoom lens of Numerical Example 4 is composed of, 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 lens group GFF with positive refractive power), a sixth lens group G6 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the eighth lens group G8 and the image plane.

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

[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 toward 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 cemented together.

[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 that is convex toward 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 cemented together to form a negative lens component L2. The negative meniscus lens 54D (negative lens L1N) and the biconvex positive lens 55D (positive lens L1P) are cemented together to form 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 cemented 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 that is convex on the image side, and the surface of the negative meniscus lens 81D on the object side is aspherical.

[0169] (Table 10) [Face Data] Zoom ratio 5.38 Surface number RDN(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 [[ID=3*]]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 X1.200 1.77250 49.6 30 46.445 D30 31 78.011 7.800 1.65412 39.7 32 -504.024 D32 33* -X35.000 1.800 1.49710 81.6<X 34 -110.103 D34 35 INFINITY 1.500 1.51633 64.1 Note: I'm not sure about the specific meaning of some notations like "Dxx" and the "Strangle" in the original text. I've tried to translate as accurately as possible while keeping the original format. Also, there seems to be an unclear "3*" and an "X" in the original which might be errors or specific notations in a particular context. I've left them as they are in the translation for now. If you can provide more context or clarify those notations, the translation can be made more precise. 36 INFINITY - (Table 11) [Various data] Infinity Near distance (Object distance 1.2m) Wide-angle Mid-telephoto Wide-angle Mid-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 Multiplier 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 plane 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] 44 to 52 and Tables 14 to 17 show the zoom lens of Numerical Example 5. FIG. 44 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 45 and 46 are longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 47 and 48 are lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 49 and 50 are longitudinal aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. FIGS. 51 and 52 are lateral aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. Table 14 shows surface data, Table 15 shows various data, Table 16 shows zoom lens group data, and Table 17 shows aspherical surface data.

[0171] The zoom lens of Numerical Example 5 is composed of, 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 lens group GFF with positive refractive power), a sixth lens group G6 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the second lens group G2 and the third lens group G3 (just before the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the eighth lens group G8 and the image plane.

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

[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 toward the object side, a biconvex positive lens 23E, a biconcave negative lens 24E, and a negative meniscus lens 25E convex toward the image side. The biconvex positive lens 23E and the biconcave negative lens 24E are cemented together.

[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 that is convex toward 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 cemented together to form a negative lens component L2. The biconvex positive lens 54E (positive lens L1P) forms 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 cemented together.

[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 that is convex on the image side, and the surface of the negative meniscus lens 81E on the object side is aspherical.

[0180] (Table 14) [Face Data] Zoom ratio 5.38 Surface number RDN(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 Strangling 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 [[ID=�7]]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 - It should be noted that there may be some inaccuracies in the translation due to the lack of clear context for some terms. For example, "絞" is translated as "Strangling" which may not be the most accurate translation without more context. You may need to adjust it according to the actual situation. (Table 15) [Various data] Infinity Near distance (Object distance 1.2m) Wide-angle Mid-telephoto Wide-angle Mid-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 Multiplier 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 plane 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] FIGS. 53 to 61 and Tables 18 to 20 show the zoom lens of Numerical Example 6. FIG. 53 shows the lens configuration when focusing on infinity at the short focal length extremity. FIGS. 54 and 55 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 56 and 57 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. FIGS. 58 and 59 show longitudinal aberration diagrams when focusing on an object-to-image distance of 1.5 m at the short focal length extremity and the long focal length extremity. FIGS. 60 and 61 show lateral aberration diagrams when focusing on an object-to-image distance of 1.5 m at the short focal length extremity and the long focal length extremity. Table 18 shows surface data, Table 19 shows various data, and Table 20 shows zoom lens group data.

[0182] The zoom lens of Numerical Example 6 is composed of, 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 lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (a 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 a "rear group." An aperture stop SP for adjusting the amount of light is provided between the third lens group G3 and the fourth lens group G4 (immediately after the third lens group G3) and moves integrally with the third lens group G3. A plane-parallel plate CG is provided between the sixth lens group G6 and the image plane.

[0183] The first lens group G1 is composed of, in order from the object side, a negative meniscus lens 11F convex toward the object side, a positive meniscus lens 12F convex toward 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 toward 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 cemented 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 toward the object side, and a negative meniscus lens 35F convex toward the object side. The biconvex positive lens 32F and the biconcave negative lens 33F are cemented 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 toward the image side, and a positive meniscus lens 43F (positive lens L1P) convex toward the object side. The biconvex positive lens 41F (positive lens L2P) and the negative meniscus lens 42F (negative lens L2N) are cemented together to form a positive lens component L2. The positive meniscus lens 43F (positive lens L1P) forms 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 toward the object side, a biconcave negative lens 52F (negative lens GFN), and a positive meniscus lens 53F (positive lens GFP) convex toward the object side. The biconcave negative lens 52F (negative lens GFN) and the positive meniscus lens 53F (positive lens GFP) are cemented together.

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

[0189] (Table 18) [Face Data] Zoom ratio 3.77 Surface number RDN(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-telephoto Wide-angle Mid-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 Multiplier 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 plane 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] Figs. 62 to 70 and Tables 21 to 23 show the zoom lens of Numerical Example 7. Fig. 62 shows the lens configuration when focusing on infinity at the short focal length extremity. Figs. 63 and 64 show longitudinal aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. Figs. 65 and 66 show lateral aberration diagrams when focusing on infinity at the short focal length extremity and the long focal length extremity. Figs. 67 and 68 show longitudinal aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. Figs. 69 and 70 show lateral aberration diagrams when focusing on an object-to-image distance of 1.2 m at the short focal length extremity and the long focal length extremity. Table 21 shows surface data, Table 22 shows various data, and Table 23 shows zoom lens group data.

[0191] The zoom lens of Numerical Example 7 is composed of, 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 lens group GFF with positive refractive power), a fifth lens group G5 with negative refractive power (a focusing lens group GF), a sixth lens group G6 with positive refractive power (a 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 a "rear group." A light-intensity adjusting aperture SP is provided between the second lens 42G and the third lens 43G of the fourth lens group G4, and moves integrally with the fourth lens group G4. A parallel plane plate CG is provided between the seventh lens group G7 and the image plane.

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

[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 toward the object side, a biconcave negative lens 23G, a positive meniscus lens 24G convex toward the object side, and a biconcave negative lens 25G. The biconcave negative lens 23G and the positive meniscus lens 24G are cemented together.

[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 toward the object side, a biconvex positive lens 45G (positive lens L2P), and a positive meniscus lens 46G (positive lens L1P) convex toward the object side. The negative meniscus lens 44G (negative lens L2N) and the biconvex positive lens 45G (positive lens L2P) are cemented together to form a positive lens component L2. The positive meniscus lens 46G (positive lens L1P) forms 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 toward 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 cemented 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) [Face Data] Zoom ratio 2.83 Surface number RDN(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-pin 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 Near distance (Object distance 1.2m) Wide-angle Mid-telephoto Wide-angle Mid-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 Multiplier 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 plane 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 blur correction amount and the corresponding movement amount of the vibration reduction lens group in Numerical Examples 1 to 7. The unit of this movement amount is millimeters (mm). (Table 24) Vibration compensation amount Drive amount Wide-angle end Mid-range 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 values ​​for each conditional expression in 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 Condition (3) -0.81 -1.24 -1.56 -0.75 Condition (4) 1.35 1.30 1.23 1.34 Condition (5) 0.41 0.39 0.29 0.36 Condition (6) 1.70 1.30 2.00 2.72 Condition (7) 4.24 3.15 6.23 2.71 Condition (8) 0.89 0.90 0.88 0.73 Condition (9) 0.56 0.57 0.60 0.46 Condition (10) 0.66 0.73 1.70 0.68 Condition (11) -5.57 -5.14 -3.65 -4.02 Condition (12) 49.60 47.82 52.32 49.60 Condition (13) -2.63 -2.50 -1.45 -2.92 Condition (14) 0.48 0.50 0.57 0.50 Condition (15) 0.12 0.12 0.12 0.22 Condition (16) -81.40 -146.38 -3.90 -17.04 Condition (17) 8.30 7.39 6.48 4.71 Condition (18) -1.01 -1.14 -0.83 -0.88 Condition (19) 1.12 1.16 1.17 1.07 Condition (20) 0.43 0.41 0.45 0.49 Condition (21) -0.82 -0.89 -0.55 -0.59 Condition (22) 1.45 1.50 1.05 0.98 Condition (23) 2.03 3.69 3.14 2.34 Conditional expression (24) - - - - Conditional expression (25) - - - - Conditional expression (26) - - - - Condition (27) 2.00100 - - - Condition (28) 2.00100 - - - Condition (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 Condition (3) -0.72 -0.84 -2.01 Condition (4) 1.34 1.34 1.09 Condition (5) 0.36 0.36 0.45 Condition (6) 2.36 2.23 1.09 Condition (7) 2.39 0.82 0.65 Condition (8) 0.75 0.71 0.89 Condition (9) 0.47 0.51 0.56 Condition (10) 0.66 0.65 0.85 Condition (11) -4.09 -5.27 -2.90 Condition (12) 47.37 81.61 39.68 Condition (13) -2.84 -0.77 -1.88 Condition (14) 0.52 0.35 0.60 Condition (15) 0.21 0.12 0.28 Condition (16) -14.95 -2.69 -2.29 Condition (17) 4.59 7.40 3.76 Condition (18) -0.91 -0.81 -1.01 Condition (19) 1.08 0.99 0.94 Condition (20) 0.48 0.36 0.24 Condition (21) -0.59 -0.51 -1.01 Condition (22) 1.08 1.09 1.34 Condition (23) 2.45 2.34 2.08 Conditional expression (24) - - 67.00 Conditional expression (25) - - 1.59349 Condition (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 and lateral aberration diagrams, various aberrations are corrected relatively well. Furthermore, despite the small number of constituent elements of the focusing lens, aberration fluctuations due to changes in shooting distance are suppressed at both the short focal length extremity and the long focal length extremity, and aberration fluctuations during image stabilization drive are also corrected well.

[0203] Even if a lens or lens group with no substantial power is added to a zoom lens included in the claims of the present invention, it will still be included within the technical scope of the present invention (and will not be considered as escaping the technical scope of the present invention).

[0204] The zoom lens of this embodiment is not limited to the five-group zoom, six-group zoom, seven-group zoom, and eight-group zoom shown in the above-mentioned numerical examples. Furthermore, an aspherical or diffractive surface may be used on any of the surfaces, and the aspherical surface may be a glass-molded aspherical surface or a ground aspherical surface formed directly on the lens surface, a composite aspherical lens (hybrid lens) in which a resin layer is applied to the lens surface and then an aspherical surface is formed on top of that, or a plastic aspherical lens made entirely from a resin material.

[0205] A digital camera (photographing device) 100 equipped with the zoom lens of this embodiment will be described with reference to FIGS.

[0206] The digital camera 100 has a camera body (housing) 101, a taking lens 102, a viewfinder 103, a flash 104, a shutter button 105, a power button 106, an LCD monitor 107, operation buttons 108, a memory card slot 109, and a zoom switch 110.

[0207] The camera body 101 houses the various components of the digital camera 100. The photographing lens 102 is, for example, a unit formed by incorporating the zoom lens of this embodiment into a lens barrel. The viewfinder 103 is a viewing window for determining the subject and composition. The flash 104 emits a flash of light when photographing at night or in dark places. The shutter button 105 is a physical switch for executing photographing with the digital camera 100. The power button 106 is a physical switch for turning the power of the digital camera 100 on and off. The LCD monitor 107 displays images captured by the digital camera 100, etc. The operation button 108 is a physical switch for setting the photographing mode of the digital camera 100, etc. The memory card slot 109 is a slot for inserting a memory card (not shown) that stores images captured by the digital camera 100, etc. The zoom switch 110 is a physical switch for changing the magnification (zooming) between the short focal length end and the long focal length end. By operating the zoom switch 110, the spacing between the lens groups of the zoom lens of this embodiment can be changed as appropriate.

[0208] The digital camera 100 has, as internal functional components of the camera body 101, 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 .

[0209] The central processing unit 111 performs various types of arithmetic processing within the digital camera 100. The image processing unit 112 performs various types of image processing on images captured by the digital camera 100. The light receiving element 113 receives external light used for photometry processing. The signal processing unit 114 performs various types of signal processing such as shooting instruction signals and image processing signals. The semiconductor memory 115 forms a temporary storage area for images captured by the digital camera 100. The communication card 116 enables wireless communication with an external device (not shown), etc.

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

[0211] Furthermore, the zoom lens of this embodiment can be applied to devices other than the digital camera 100 described above, such as interchangeable lenses, personal digital assistant devices, video cameras, silver halide cameras, optical sensors, and projection optical systems (projectors).

[0212] 73 is a diagram showing an example of the external configuration of a lens barrel (imaging device) LX equipped with a zoom lens according to this embodiment. The lens barrel LX is configured, for example, as an interchangeable zoom 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 surface of the fixed barrel 10. A zoom ring 11 is fitted to the front region of the circumferential surface of the fixed barrel 10 in the optical axis direction, and a focus ring 12 is fitted to the rear region. Rubber rings ZG and FG are fixed to the circumferential surfaces of the zoom ring 11 and focus ring 12, respectively, to improve tactile feel during operation.

[0213] The lens barrel LX can be attached to and detached from a camera body (not shown) using a lens mount 100LM provided on a fixed barrel 10, and zooming can be performed to the long focus (telephoto) side or the short focus (wide) side by rotating the zoom ring 11. Furthermore, by pressing a retraction button B located on the periphery and rotating the zoom ring 11 further to the short focus side, the lens barrel LX can be set to a retracted state in which its length is minimized. Focusing is performed automatically by a built-in motor, but manual focusing is also possible by rotating the focus ring 12.

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

[0215] Although not shown, a helicoid barrel with a helicoid groove formed on its outer peripheral surface is fitted around the outer periphery of the inner direct-acting barrel. This helicoid barrel moves axially together with the inner direct-acting barrel, but is also connected to the zoom ring 11, and rotates around the barrel axis on the circumferential surface of the inner direct-acting barrel as the zoom ring 11 rotates. A front direct-acting barrel 16 is fitted radially between this helicoid barrel and the outer direct-acting barrel 13. This front direct-acting barrel 16 is fitted into the helicoid groove of the helicoid barrel and moves in the optical axis direction as the helicoid barrel rotates. A lens L1 is supported at the front end of this front direct-acting barrel 16. The lens L1 shown in FIG. 73 can be, for example, the lens (11A, 11B, 11C, 11D, 11E, 11F, 11G) located closest to the object in the first lens group G1 of the zoom lens of this embodiment. The lens barrel LX is also provided with components (for example, an ON / OFF switch for vibration reduction drive) for exerting and assisting the functions of the zoom lens of this embodiment. [Explanation of symbols]

[0216] G1 First lens group G2 Second lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group G7 7th lens group G8 8th lens group GF Focusing Lens Group GFP positive lens GFN negative lens GFF: A lens group with positive refractive power located adjacent to the focusing lens group on the object side 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. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following conditional expressions (1) and (6A) are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (6A) 1<fL1 / fGFF<5 however, NdL1P: refractive index of the positive lens L1P, fL1: the focal length of the positive lens component L1, fGFF: the focal length of the lens group GFF having the positive refractive power.

2. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following conditional expressions (1) and (8) are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (8) 0.1<TLT / fT<0.95 however, NdL1P: refractive index of the positive lens L1P, TLT: total lens length at the long focal length end when focused on infinity, fT: focal length of the entire system when focused at infinity at the long focal length end.

3. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following conditional expressions (1) and (9) are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (9) 0.1<f1 / fT<1 however, NdL1P: refractive index of the positive lens L1P, f1: focal length of the first lens group, fT: focal length of the entire system when focused at infinity at the long focal length end.

4. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following conditional expressions (1) and (11) are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (11)-8<f1 / f2<-2 however, NdL1P: refractive index of the positive lens L1P, f1: focal length of the first lens group, f2: the focal length of the second lens group.

5. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following conditional expressions (1) and (17') are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (17')3.5<|(1-M_GFT 2 )×M_GFRT 2 | however, NdL1P: refractive index of the positive lens L1P, M_GFT: lateral magnification of the focusing lens group GF when focusing on infinity at the long focal length end, M_GFRT: composite lateral magnification of all lens groups arranged on the image side of the focusing lens group GF when focusing on infinity at the long focal length extremity (when the focusing lens group GF is located closest to the image side, M_GFRT=1).

6. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, the first lens group G1 has at least two positive lenses and at least one negative lens, The following conditional expressions (1) and (18) are satisfied: A zoom lens characterized by: (1) 1.85<NdL1P (18) -10<f1 / fN<-0.7 however, NdL1P: refractive index of the positive lens L1P, f1: 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.

7. The lens has, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear lens group; the rear group has at least six lens groups; When changing magnification from the short focal length end to the long focal length end, the spacing 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 close distance, at least one lens group located closer to the image than the focusing lens group GF; Among the lens groups having positive refractive power included in the rear group, a lens group GFF having positive refractive power arranged adjacent to the focusing lens group GF on the object side has a positive lens component L1 located closest to the image side, The positive lens component L1 has a positive lens L1P, The following condition (1') is satisfied: A zoom lens characterized by: (1') 1.87<NdL1P however, NdL1P: the refractive index of the positive lens L1P.

8. The following conditional expression (2) is satisfied:

8. The zoom lens according to claim 1, wherein the first and second lenses are arranged in a plane parallel to each other. (2) 25<νdL1P however, νdL1P: Abbe number of the positive lens L1P.

9. The following condition (3) is satisfied:

9. The zoom lens according to claim 1, wherein the first and second lenses are arranged in a plane parallel to each other. (3) -5<fGFF / fGF<-0.7 however, fGFF: the focal length of the lens group GFF having the positive refractive power, fGF: the focal length of the focusing lens group GF.

10. 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 following condition (4) is satisfied:

10. The zoom lens according to claim 1. (4) 1.0<NdL2N / NdL2P<1.6 however, NdL2N: refractive index of the negative lens L2N, NdL2P: the refractive index of the positive lens L2P.

11. 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 following condition (5) is satisfied:

11. The zoom lens according to claim 1. (5) 0.2<νdL2N / νdL2P<0.7 however, νdL2P: Abbe number of the positive lens L2P, νdL2N: Abbe number of the negative lens L2N.

12. The following condition (6) is satisfied:

12. The zoom lens according to claim 2, wherein the first and second lenses are arranged in a plane parallel to each other. (6) 0.5<fL1 / fGFF<5 however, fL1: the focal length of the positive lens component L1, fGFF: the focal length of the lens group GFF having the positive refractive power.

13. A positive or negative lens component L2 is 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 following condition (7) is satisfied:

13. The zoom lens according to claim 1. (7) 0.5<|fL2| / fL1<20 however, fL1: the focal length of the positive lens component L1, fL2: the focal length of the lens component L2.

14. The following condition (8) is satisfied:

14. The zoom lens according to claim 1, or any one of claims 3 to 13. (8) 0.1<TLT / fT<0.95 however, TLT: total lens length at the long focal length end when focused on infinity, fT: focal length of the entire system when focused at infinity at the long focal length end.

15. The following condition (9) is satisfied:

15. The zoom lens according to claim 1, claim 2, or claim 4 to claim 14. (9) 0.1<f1 / fT<1 however, f1: focal length of the first lens group, fT: focal length of the entire system when focused at infinity at the long focal length end.

16. The following condition (10) is satisfied:

16. The zoom lens according to claim 1. (10) 0.3<f2 / fGF<3.0 however, f2: the focal length of the second lens group, fGF: the focal length of the focusing lens group GF.

17. The following condition (11) is satisfied:

17. The zoom lens according to claim 1, wherein the first and second lenses are arranged in a plane parallel to each other. (11)-8<f1 / f2<-2 however, f1: focal length of the first lens group, f2: the focal length of the second lens group.

18. the first lens group or the second lens group has a fixed position in the optical axis direction during zooming from the short focal length end to the long focal length end; 18. The zoom lens according to claim 1.

19. the focusing lens group GF has at least one negative lens, The following conditional expression (12) is satisfied:

19. The zoom lens according to claim 1. (12) 35<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.

20. the focusing lens group GF has at least one negative lens and at least one positive lens, The following condition (13) is satisfied:

20. The zoom lens according to claim 1, wherein the first and second lenses are arranged in a plane parallel to each other. (13) -10<fGFP / fGFN<-0.5 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.

21. the focusing lens group GF has at least one negative lens and at least one positive lens, The following condition (14) is satisfied:

21. The zoom lens according to claim 1. (14) 0.2<νdGFP / νdGFN<0.7 however, 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.

22. The following conditional expression (15) is satisfied:

22. The zoom lens according to claim 1. (15) 0.1<DGFRT / TLT<0.5 however, TLT: total lens length at the long focal length end when focused on infinity, DGFRT: the distance on the optical axis from the refractive surface closest to the image of the lens group GFF having positive refractive power to the refractive surface closest to the object of the lens group that is closer to the image than the focusing lens group GF when focusing at infinity at the long focal length extremity.

23. The following conditional expression (16) is satisfied:

23. The zoom lens according to claim 1. (16) |fGFRT| / fGF<-1.5 however, fGFRT: composite focal length of the lens group closer to the image side than the focusing lens group GF when focusing on infinity at the long focal length end, fGF: the focal length of the focusing lens group GF.

24. A lens barrel having a zoom lens according to any one of claims 1 to 23.

25. An imaging device having a zoom lens according to any one of claims 1 to 23.

Images