Large aperture ratio telephoto zoom lens

Abstract

To provide a large aperture ratio telephoto zoom lens that achieves miniaturization and light-weight, and has a high optical performance while having a tremor-proof mechanism and a silent and high-speed focus mechanism loaded.SOLUTION: A large aperture ratio telephoto zoom lens consists of, in order from an object side to an image side,: a first lens group G1 that has a fixed and positive refractive index with respect to an imaging surface when changing magnification; a second lens group G2 that has a negative refractive index; a third lens group G3 that has the negative refractive index; a fourth lens group G4 that has the positive refractive index; an aperture stop S; and a subsequent lens group GR that is composed of a plurality of lens groups, in which intervals between adjacent lens groups vary when changing the magnification from a wide-angle end to a telephoto end, the subsequent lens group GR has a moving focus lens group when focusing from an object at infinity to an object at a close distance, and a specific conditional expression is satisfied.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a large aperture telephoto zoom lens that is a variable magnification imaging optical system suitable for an imaging optical system used in imaging devices such as digital cameras and video cameras, and has high optical performance while being lightweight and equipped with an anti-vibration mechanism and a quiet and high-speed focus mechanism. [Background technology]

[0002] In recent years, the number of pixels in digital cameras has increased and pixel density has increased, and so zoom lenses with high optical performance are in demand. In particular, in order to resolve images up to high spatial frequencies, it is desirable to reduce various aberrations. However, in general, the larger the aperture ratio, the more difficult it becomes to suppress aberrations.

[0003] Furthermore, the larger the aperture ratio, the larger the lens diameter becomes, making it difficult to reduce the weight of the lens. In particular, in a telephoto zoom lens with a large aperture ratio, the focus lens group tends to be heavy, and it becomes necessary to use a large actuator to realize quiet and high-speed focus drive. However, using a large actuator goes against the weight reduction of the zoom lens. Therefore, by making the focus lens group smaller and lighter, quiet and high-speed focus drive is realized without making the actuator larger (for example, Patent Document 2).

[0004] Similarly, the weight of the anti-vibration lens group tends to increase as the aperture ratio increases, making it necessary to use a large actuator. However, by making the anti-vibration lens group smaller and lighter, it has been possible to achieve high tracking performance of the anti-vibration drive (movement of the imaging position by shifting the anti-vibration lens group) without increasing the size of the actuator (for example, Patent Documents 1 and 2).

[0005] Here, the following patent documents are cited as examples of large aperture telephoto zoom lenses having an anti-vibration mechanism and a zoom ratio of about 3x. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication 2019-191317 [Patent Document 2] Patent Publication No. 2021-076830 Summary of the Invention [Problem to be solved by the invention]

[0007] Patent Document 1 discloses a zoom lens with a five-group configuration. By using LmB, which has a low light ray height, as the vibration-proof lens group, the vibration-proof mechanism is made smaller and lighter. However, the focus lens group is the second lens group, which has a large lens diameter and is heavy. This causes problems such as increased noise during focus drive, a decrease in focus drive speed, and an increase in the size of the actuator, which leads to an increase in the outer diameter of the lens barrel and an increase in weight.

[0008] Patent Document 2 discloses a zoom lens with a seven-group configuration. The fifth and sixth focus lens groups are composed of one or two lenses with small diameters, making the focus lens groups lightweight and enabling quiet and high-speed focus drive without increasing the size of the actuator. However, there is a problem in that the axial light beam diameter at the telephoto end from the second lens group to the aperture is large, and the number of lenses from the second lens group to the aperture is also large at seven, making it difficult to reduce the weight.

[0009] The present invention has been made in view of the above circumstances, and has as its object to provide a large aperture ratio telephoto zoom lens that is equipped with an anti-vibration mechanism and a quiet and high-speed focus mechanism, while also achieving compactness, light weight, and high optical performance. [Means for solving the problem]

[0010] A large aperture ratio telephoto zoom lens comprising, in order from the object side to the image side, a first lens group G1 having a fixed positive refractive power with respect to an image plane during zooming, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, wherein the spacing between adjacent lens groups changes when zooming from the wide-angle end to the telephoto end, and the subsequent lens group GR has a focusing lens group that moves when focusing from an object at infinity to an object at a close distance, and wherein the following conditional expression is satisfied: (1)-1.18 <f2 / fT<-0.37 (2) -0.94 <f3 / fT<-0.35 f2: the focal length of the second lens group G2 fT: focal length of the entire optical system when focused at infinity at the telephoto end f3: the focal length of the third lens group G3

[0011] The zoom lens comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, an aperture stop S that is fixed with respect to the image plane during zooming, a fifth lens group G5 having positive refractive power that is fixed with respect to the image plane during zooming, a sixth lens group G6 having negative refractive power, a seventh lens group G7 having positive refractive power, and an eighth lens group G8 having negative refractive power that is fixed with respect to the image plane during zooming. When zooming from the wide-angle end to the telephoto end, the spacing between adjacent lens groups changes. a focusing lens group that is disposed on the image side of the aperture stop S and that moves during focusing from an object at infinity to an object at a close distance; A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1)-1.18 <f2 / fT<-0.37 (2) -0.94 <f3 / fT<-0.35 f2: the focal length of the second lens group G2 fT: focal length of the entire optical system when focused at infinity at the telephoto end f3: the focal length of the third lens group G3 Effect of the Invention

[0012] According to the present invention, it is possible to provide a large aperture ratio telephoto zoom lens that is equipped with an anti-vibration mechanism and a quiet and high-speed focus mechanism, while also achieving compactness, light weight, and high optical performance. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram showing a lens configuration according to a first embodiment of the present invention. [Diagram 2] 4A to 4C are longitudinal aberration diagrams of the first embodiment when focused on an object at infinity at the wide-angle end. [Diagram 3] 1 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 1. [Figure 4] 1 is a longitudinal aberration diagram of Example 1 when the intermediate focal length is focused on infinity. FIG. [Diagram 5] 1 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 1. [Figure 6] 4A to 4C are longitudinal aberration diagrams of the first embodiment when focused on an object at infinity at the telephoto end. [Figure 7] 1A to 1C are longitudinal aberration diagrams for Example 1 at a shooting distance of 1.0 m at the telephoto end. [Figure 8] 4A to 4C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the wide-angle end in Example 1. [Figure 9] 11A to 11C are diagrams illustrating lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the wide-angle end of Example 1. [Figure 10] 4A to 4C are lateral aberration diagrams at a shooting distance of 1.0 m at the wide-angle end of Example 1. [Figure 11] 4A to 4C are diagrams illustrating lateral aberration when the intermediate focal length of the first embodiment is focused on infinity. [Figure 12] 11 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 1. FIG. [Figure 13] 4A to 4C are diagrams showing lateral aberration at a shooting distance of 1.0 m for the intermediate focal length of Example 1. [Figure 14] 4A to 4C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the telephoto end in Example 1. [Figure 15]11A to 11C are diagrams illustrating lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the telephoto end of Example 1. [Figure 16] 4A to 4C are diagrams illustrating lateral aberration at a shooting distance of 1.0 m at the telephoto end of Example 1. [Figure 17] FIG. 11 is a lens configuration diagram according to Example 2 of the present invention. [Figure 18] FIG. 11 is a longitudinal aberration diagram of Example 2 when focusing on an object at infinity at the wide-angle end. [Figure 19] FIG. 11 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end of Example 2. [Figure 20] FIG. 11 is a longitudinal aberration diagram of Example 2 when the intermediate focal length is focused on infinity. [Figure 21] FIG. 11 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 2. [Figure 22] FIG. 11 is a longitudinal aberration diagram of Example 2 when focusing on an object at infinity at the telephoto end. [Diagram 23] FIG. 11 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the telephoto end of Example 2. [Figure 24] FIG. 11 is a lateral aberration diagram of Example 2 when focusing on an object at infinity at the wide-angle end. [Diagram 25] FIG. 11 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the wide-angle end of Example 2. [Figure 26] 11A to 11C are lateral aberration diagrams at a shooting distance of 1.0 m at the wide-angle end of Example 2. [Figure 27] FIG. 11 is a lateral aberration diagram when the intermediate focal length of Example 2 is focused on infinity. [Figure 28] FIG. 11 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 2. [Figure 29] FIG. 11 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 2. [Diagram 30] FIG. 11 is a lateral aberration diagram of Example 2 when focusing on an object at infinity at the telephoto end. [Diagram 31] FIG. 11 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the telephoto end of Example 2. [Diagram 32]11A to 11C are diagrams illustrating lateral aberration at a shooting distance of 1.0 m at the telephoto end of Example 2. [Diagram 33] FIG. 11 is a lens configuration diagram according to Example 3 of the present invention. [Diagram 34] FIG. 11 is a longitudinal aberration diagram of Example 3 when focusing on an object at infinity at the wide-angle end. [Diagram 35] FIG. 11 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 3. [Diagram 36] FIG. 11 is a longitudinal aberration diagram of Example 3 when the intermediate focal length is focused on infinity. [Figure 37] FIG. 11 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 3. [Figure 38] FIG. 11 is a longitudinal aberration diagram of Example 3 when focusing on an object at infinity at the telephoto end. [Figure 39] 13A to 13C are longitudinal aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 3. [Diagram 40] 13A to 13C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the wide-angle end in Example 3. [Diagram 41] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the wide-angle end of Example 3. [Diagram 42] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the wide-angle end of Example 3. [Diagram 43] FIG. 11 is a lateral aberration diagram when the intermediate focal length of Example 3 is focused on infinity. [Diagram 44] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 3. [Diagram 45] 13A to 13C are diagrams illustrating lateral aberration at a shooting distance of 1.0 m for the intermediate focal length of Example 3. [Diagram 46] 13A to 13C are diagrams illustrating lateral aberration when focusing on an object at infinity at the telephoto end of Example 3. [Figure 47] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the telephoto end of Example 3. [Figure 48] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 3. [Figure 49] FIG. 11 is a lens configuration diagram according to Example 4 of the present invention. [Figure 50] 13A to 13C are longitudinal aberration diagrams of Example 4 when focused on an object at infinity at the wide-angle end. [Figure 51] 13A to 13C are longitudinal aberration diagrams for Example 4 at a shooting distance of 1.0 m at the wide-angle end. [Figure 52] FIG. 13 is a longitudinal aberration diagram of Example 4 when the intermediate focal length is focused on infinity. [Figure 53] FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 4. [Figure 54] 13A to 13C are longitudinal aberration diagrams of Example 4 when focused on an object at infinity at the telephoto end. [Figure 55] 13A to 13C are longitudinal aberration diagrams for Example 4 at a shooting distance of 1.0 m at the telephoto end. [Figure 56] 13A to 13C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the wide-angle end in Example 4. [Figure 57] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the wide-angle end in Example 4. [Figure 58] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the wide-angle end of Example 4. [Figure 59] FIG. 13 is a lateral aberration diagram of Example 4 when the intermediate focal length is focused on infinity. [Figure 60] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 4. [Figure 61] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m for the intermediate focal length of Example 4. [Figure 62] FIG. 13 is a lateral aberration diagram of Example 4 when focusing on an object at infinity at the telephoto end. [Figure 63] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the telephoto end of Example 4. [Figure 64] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 4. [Figure 65] FIG. 11 is a lens configuration diagram according to Example 5 of the present invention. [Figure 66] FIG. 13 is a longitudinal aberration diagram of Example 5 when focusing on an object at infinity at the wide-angle end. [Figure 67]FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 5. [Figure 68] FIG. 13 is a longitudinal aberration diagram of Example 5 when the intermediate focal length is focused on infinity. [Figure 69] FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 5. [Figure 70] FIG. 13 is a longitudinal aberration diagram of Example 5 when focusing on an object at infinity at the telephoto end. [Figure 71] 13A to 13C are longitudinal aberration diagrams for Example 5 at a shooting distance of 1.0 m at the telephoto end. [Figure 72] 13A to 13C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the wide-angle end in Example 5. [Figure 73] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the wide-angle end in Example 5. [Figure 74] 13A to 13C are lateral aberration diagrams for Example 5 at a shooting distance of 1.0 m at the wide-angle end. [Figure 75] FIG. 13 is a lateral aberration diagram when the intermediate focal length of Example 5 is focused on infinity. [Figure 76] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 5. [Figure 77] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 5. [Figure 78] FIG. 13 is a lateral aberration diagram of Example 5 when focusing on an object at infinity at the telephoto end. [Figure 79] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the telephoto end of Example 5. [Figure 80] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 5. [Figure 81] FIG. 11 is a lens configuration diagram according to Example 6 of the present invention. [Figure 82] FIG. 23 is a longitudinal aberration diagram of Example 6 when focusing on an object at infinity at the wide-angle end. [Figure 83] 23A to 23C are longitudinal aberration diagrams of Example 6 at a shooting distance of 1.0 m at the wide-angle end. [Figure 84]FIG. 23 is a longitudinal aberration diagram of Example 6 when the intermediate focal length is focused on infinity. [Figure 85] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 6. [Figure 86] FIG. 23 is a longitudinal aberration diagram of Example 6 when focusing on an object at infinity at the telephoto end. [Figure 87] 23A to 23C are longitudinal aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 6. [Figure 88] 13A to 13C are diagrams illustrating lateral aberration when the lens is focused on an object at infinity at the wide-angle end in Example 6. [Figure 89] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the wide-angle end in Example 6. [Figure 90] 23A to 23C are lateral aberration diagrams at a shooting distance of 1.0 m at the wide-angle end in Example 6. [Figure 91] FIG. 23 is a lateral aberration diagram of Example 6 when the intermediate focal length is focused on infinity. [Figure 92] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 6. [Figure 93] FIG. 23 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 6. [Figure 94] FIG. 23 is a lateral aberration diagram of Example 6 when focusing on an object at infinity at the telephoto end. [Figure 95] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the telephoto end of Example 6. [Figure 96] 23A to 23C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 6. [Figure 97] FIG. 13 is a lens configuration diagram according to Example 7 of the present invention. [Figure 98] FIG. 13 is a longitudinal aberration diagram of Example 7 when focusing on an object at infinity at the wide-angle end. [Figure 99] FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 7. [Figure 100] FIG. 13 is a longitudinal aberration diagram of Example 7 when the intermediate focal length is focused on infinity. [Figure 101]FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 7. [Figure 102] FIG. 13 is a longitudinal aberration diagram of Example 7 when focusing on an object at infinity at the telephoto end. [Figure 103] 13A to 13C are longitudinal aberration diagrams for Example 7 at a shooting distance of 1.0 m at the telephoto end. [Figure 104] FIG. 13 is a lateral aberration diagram of Example 7 when focusing on an object at infinity at the wide-angle end. [Figure 105] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the wide-angle end in Example 7. [Figure 106] 13A to 13C are lateral aberration diagrams for Example 7 at a shooting distance of 1.0 m at the wide-angle end. [Figure 107] FIG. 13 is a lateral aberration diagram of Example 7 when the intermediate focal length is focused on infinity. [Figure 108] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 7. [Figure 109] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 7. [Figure 110] FIG. 13 is a lateral aberration diagram of Example 7 when focusing on an object at infinity at the telephoto end. [Figure 111] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the telephoto end of Example 7. [Figure 112] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m at the telephoto end of Example 7. [Figure 113] FIG. 13 is a lens configuration diagram according to Example 8 of the present invention. [Fig. 114] FIG. 23 is a longitudinal aberration diagram of Example 8 when focusing on an object at infinity at the wide-angle end. [Fig. 115] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 8. [Fig. 116] FIG. 23 is a longitudinal aberration diagram of Example 8 when the intermediate focal length is focused on infinity. [Fig. 117] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 8. [Figure 118]FIG. 23 is a longitudinal aberration diagram of Example 8 when focusing on an object at infinity at the telephoto end. [Figure 119] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the telephoto end in Example 8. [Figure 120] FIG. 23 is a lateral aberration diagram of Example 8 when focusing on an object at infinity at the wide-angle end. [Figure 121] FIG. 23 is a lateral aberration diagram of Example 8 during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the wide-angle end. [Figure 122] 13A to 13C are lateral aberration diagrams for Example 8 at a shooting distance of 1.0 m at the wide-angle end. [Figure 123] FIG. 23 is a lateral aberration diagram of Example 8 when the intermediate focal length is focused on infinity. [Figure 124] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 8. [Fig. 125] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 8. [Fig. 126] FIG. 23 is a lateral aberration diagram of Example 8 when focusing on an object at infinity at the telephoto end. [Figure 127] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the telephoto end in Example 8. [Figure 128] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 8. [Figure 129] FIG. 13 is a lens configuration diagram according to Example 9 of the present invention. [Fig. 130] FIG. 13 is a longitudinal aberration diagram of Example 9 when focusing on an object at infinity at the wide-angle end. [Fig. 131] FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 9. [Fig. 132] FIG. 13 is a longitudinal aberration diagram of Example 9 when the intermediate focal length is focused on infinity. [Fig. 133] FIG. 13 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 9. [Fig. 134] FIG. 13 is a longitudinal aberration diagram of Example 9 when focusing on an object at infinity at the telephoto end. [Fig. 135] 13A to 13C are longitudinal aberration diagrams for Example 9 at a shooting distance of 1.0 m at the telephoto end. [Fig. 136] 13A to 13C are lateral aberration diagrams of Example 9 when focused on an object at infinity at the wide-angle end. [Fig. 137] FIG. 13 is a lateral aberration diagram of Example 9 during image stabilization for a camera shake angle of 0.4° when focusing on an object at infinity at the wide-angle end. [Figure 138] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 9. [Figure 139] FIG. 13 is a lateral aberration diagram of Example 9 when the intermediate focal length is focused on infinity. [Fig. 140] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 9. [Fig. 141] FIG. 13 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 9. [Fig. 142] 13A to 13C are diagrams illustrating lateral aberration when the telephoto end of Example 9 is focused on an object at infinity. [Fig. 143] FIG. 13 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the telephoto end of Example 9. [Fig. 144] 13A to 13C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 9. [Fig. 145] FIG. 13 is a lens configuration diagram according to a tenth embodiment of the present invention. [Fig. 146] FIG. 23 is a longitudinal aberration diagram of Example 10 when focusing on an object at infinity at the wide-angle end. [Fig. 147] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 10. [Fig. 148] FIG. 23 is a longitudinal aberration diagram of Example 10 when the intermediate focal length is focused on infinity. [Figure 149] FIG. 23 is a longitudinal aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 10. [Fig. 150] FIG. 23 is a longitudinal aberration diagram of Example 10 when focusing on an object at infinity at the telephoto end. [Fig. 151] 23A to 23C are longitudinal aberration diagrams at a shooting distance of 1.0 m at the telephoto end in Example 10. [Fig. 152] FIG. 23 is a lateral aberration diagram of Example 10 when focusing on an object at infinity at the wide-angle end. [Fig. 153]FIG. 23 is a lateral aberration diagram of Example 10 when focusing on infinity at the wide-angle end and with a camera shake angle of 0.4° during image stabilization. [Fig. 154] FIG. 23 is a lateral aberration diagram at a shooting distance of 1.0 m at the wide-angle end in Example 10. [Fig. 155] FIG. 23 is a lateral aberration diagram of Example 10 when the intermediate focal length is focused on infinity. [Fig. 156] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at an intermediate focal length in Example 10. [Fig. 157] FIG. 23 is a lateral aberration diagram at a shooting distance of 1.0 m for the intermediate focal length of Example 10. [Fig. 158] FIG. 23 is a lateral aberration diagram of Example 10 when focusing on infinity at the telephoto end. [Fig. 159] FIG. 23 is a diagram showing lateral aberration during image stabilization for a camera shake angle of 0.4° when focusing on infinity at the telephoto end in Example 10. [Fig. 160] 23A to 23C are lateral aberration diagrams at a shooting distance of 1.0 m at the telephoto end of Example 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A zoom lens according to an embodiment of the present invention will be described below. Note that the following description of the embodiment is an example of the optical system of the present invention, and the present invention is not limited to this embodiment without departing from the gist of the present invention. In addition, the object side will be described as the front and the image side as the rear.

[0015] In the following description of the embodiment, the refractive indices of the materials for the g-line (wavelength 435.8 nm), F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) are Ng, NF, Nd, and NC, respectively. The Abbe number νd, partial dispersion ratio PgF, and anomalous partial dispersion ΔPgF are expressed as follows: νd = (Nd-1) / (NF-NC) PgF = (Ng-NF) / (NF-NC) ΔPgF = PgF-0.64833+0.00180×νd It is expressed as:

[0016] In this application, when counting the number of lenses, unless otherwise specified, a single lens is counted as one lens, and in the case of a cemented lens, each of the single lenses constituting the cemented lens is counted as one lens. For example, a cemented lens of a convex lens and a concave lens is counted as two lenses.

[0017] As can be seen from the lens construction diagrams shown in Figures 1, 17, 33, 49, 65, 81, 97, 113, 129 and 145, the first zoom lens of the present invention comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of a plurality of lens groups, with the spacing between adjacent lens groups changing during zooming from the wide-angle end to the telephoto end, and the subsequent lens group GR having a focusing lens group that moves when focusing from an object at infinity to an object at a close distance.

[0018] Because the first lens group G1 of a large aperture ratio telephoto zoom lens has a large diameter and is heavy, making it possible to move the first lens group G1 during zooming would result in an increase in the size and complexity of the magnification change mechanism, which would ultimately lead to an increase in the size and weight of the lens barrel, which is undesirable.

[0019] By moving the second lens group G2 and the third lens group G3 on different trajectories during zooming, it becomes possible to suppress aberration fluctuations, particularly fluctuations in curvature of field, during zooming.

[0020] The positive fourth lens group G4 has the function of converging the axial light beam diverged by the negative second lens group G2 and the negative third lens group G3, thereby reducing the diameter of the axial light beam incident on the subsequent lens group GR. In addition, by disposing a focusing lens group within the subsequent lens group GR into which the light beam converged by the fourth lens group G4 is incident, it is possible to reduce the outer diameter of the focusing lens group.

[0021] The zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions: (1)-1.18 <f2 / fT<-0.37 (2) -0.94 <f3 / fT<-0.35 f2: the focal length of the second lens group G2 fT: focal length of the entire optical system when focused at infinity at the telephoto end f3: the focal length of the third lens group G3

[0022] Conditional expression (1) defines a preferable range for the ratio of the focal length of the second lens group G2 to the focal length of the entire optical system when focused on infinity at the telephoto end.

[0023] When the upper limit of conditional formula (1) is exceeded and the negative refractive power of the second lens group G2 becomes stronger, various aberrations such as spherical aberration and curvature of field occurring in the second lens group G2 become large, making it difficult to satisfactorily correct the various aberrations over the entire zoom range. When the lower limit of conditional formula (1) is exceeded and the negative refractive power of the second lens group G2 becomes weaker, the zoom ratio of the entire system decreases, so the amount of movement of the second lens group G2 increases to compensate for the zooming effect, and in order to secure the space required for zooming, the aperture stop S and the subsequent lens group GR must be thinned in the thickness direction, resulting in a shortage of space for arranging a focusing actuator. In addition, when an anti-vibration lens group is arranged in the subsequent lens group, there is a shortage of space for arranging an anti-vibration actuator.

[0024] Incidentally, by limiting the lower limit of condition (1) to -1.08 or the upper limit to -0.41, the above-mentioned effect can be ensured.

[0025] Conditional expression (2) defines a preferable range for the ratio of the focal length of the third lens group G3 to the focal length of the entire optical system when focused on infinity at the telephoto end.

[0026] When the upper limit of conditional expression (2) is exceeded and the negative refractive power of the third lens group G3 becomes strong, various aberrations such as spherical aberration and curvature of field occurring in the third lens group G3 become large, making it difficult to satisfactorily correct the various aberrations over the entire zoom range. When the lower limit of conditional expression (2) is exceeded and the negative refractive power of the third lens group G3 becomes weak, the zoom ratio of the entire system decreases, so the amount of movement of the third lens group G3 increases to compensate for the zooming action, and in order to secure the space required for zooming, the aperture stop S and the subsequent lens group GR must be thinned in the thickness direction, resulting in a shortage of space for arranging a focusing actuator. In addition, when an anti-vibration lens group is arranged in the subsequent lens group, there is a shortage of space for arranging an anti-vibration actuator.

[0027] Incidentally, by limiting the lower limit of condition (2) to -0.86 or the upper limit to -0.41, the above-mentioned effect can be ensured.

[0028] Furthermore, the zoom lens of the present invention is configured to include an aperture stop S that is fixed with respect to the image plane during zooming, a fifth lens group G5 with positive refractive power that is fixed with respect to the image plane during zooming, 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 that is fixed with respect to the image plane during zooming.

[0029] The sixth lens group G6 and the seventh lens group G7 are disposed on the way where the axial light beam converges toward the image plane, and by changing the distance between the fifth lens group G5 and the sixth lens group G6 or the distance between the seventh lens group G7 and the eighth lens group G8, it is possible to change the height of the F-number light beam incident on the sixth lens group G6 or the seventh lens group G7, thereby changing the spherical aberration. By utilizing this property, it is possible to properly correct the spherical aberration over the entire zoom range by appropriately setting the distance between the fifth lens group G5 and the sixth lens group G6 or the distance between the seventh lens group G7 and the eighth lens group G8 during magnification.

[0030] In the case of a lens in which the first lens group G1 is fixed during zooming, as in the present invention, in order to lengthen the overall optical length relative to the focal length at the wide-angle side, a retrofocus type refractive power arrangement is asymmetric with respect to the aperture stop S. On the other hand, in order to shorten the overall optical length relative to the focal length at the telephoto side, a telephoto type refractive power arrangement is asymmetric with respect to the aperture stop S. As a result, lateral chromatic aberration occurs in the over-exposure direction for the C-line at the wide-angle side, and lateral chromatic aberration occurs in the under-exposure direction for the C-line at the telephoto side. For this reason, in order to reduce lateral chromatic aberration over the entire wavelength, the g-line and the C-line are often collected together. In such a case, if the difference in the imaging magnification between the g-line and the C-line and other wavelengths is large, a color blur such as reddish purple appears on the contour of the subject as a secondary spectrum, which is undesirable. Therefore, it is effective to use a glass material with anomalous dispersion to correct the secondary spectrum.

[0031] A zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions. (3) 67.00<νn (4) 0.018<ΔPgFn νn: the average Abbe number of the negative lenses used in the second lens group G2 and the third lens group G3 ΔPgFn: the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3

[0032] Conditional expression (3) defines a preferable range for the average value of the Abbe numbers of the negative lenses used in the second lens group G2 and the third lens group G3.

[0033] When the average Abbe number of the negative lenses used in the second lens group G2 and the third lens group G3 becomes small beyond the lower limit of conditional expression (3), the axial chromatic aberration and lateral chromatic aberration generated in the second lens group G2 and the third lens group G3 become large, making it difficult to satisfactorily correct the axial chromatic aberration and lateral chromatic aberration over the entire zoom range.

[0034] Incidentally, by setting the lower limit of condition (3) to 70.00, the above-mentioned effect can be ensured more reliably.

[0035] Conditional expression (4) defines a preferable range for the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3.

[0036] If the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3 becomes small beyond the lower limit of conditional expression (4), it becomes difficult to suppress the secondary spectrum of lateral chromatic aberration on the wide-angle side.

[0037] Incidentally, by setting the lower limit of condition (4) to preferably 0.021, the above-mentioned effect can be ensured more reliably.

[0038] Furthermore, in the zoom lens of the present invention, the fifth lens group G5 is configured to have a vibration-proof lens group with negative refractive power that moves in a direction approximately perpendicular to the optical axis during image blur correction. By providing the vibration-proof lens group within the fifth lens group G5 that is fixed with respect to the image plane during magnification change, a mechanism for moving the vibration-proof mechanism including an actuator for driving the vibration-proof lens group in a direction perpendicular to the optical axis during magnification change is not required, and the size and complexity of the lens can be reduced.

[0039] The zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions: (5)-2.70<(1-βosT)×βRosT<-0.52 βosT: The lateral magnification of the vibration-proof lens group when focusing on infinity at the telephoto end βRosT: The lateral magnification of the lens system located on the image side of the image stabilizing lens group when focusing on infinity at the telephoto end

[0040] Condition (5) defines a preferable range for the vibration reduction coefficient of the vibration reduction lens group when focusing on infinity at the telephoto end.

[0041] If the vibration-proof lens group's vibration-proof coefficient becomes large beyond the upper limit of conditional formula (5), the amount of movement of the vibration-proof lens group in the direction perpendicular to the optical axis becomes large in order to obtain the necessary correction angle, and the lens barrel diameter becomes large, making it difficult to reduce the size and weight. If the vibration-proof lens group's vibration-proof coefficient becomes small beyond the lower limit of conditional formula (5), the negative refractive power of the vibration-proof lens group becomes strong, so the weight of the vibration-proof lens group increases, and the vibration-proof actuator becomes large and heavy. In addition, it becomes difficult to suppress fluctuations in coma aberration and astigmatism due to decentering during vibration isolation.

[0042] Incidentally, by limiting the lower limit of condition (5) to -2.50 or the upper limit to -0.59, the above-mentioned effect can be ensured more reliably.

[0043] Furthermore, in the zoom lens of the present invention, the vibration-reduction lens group is configured to be composed of, in order from the object side to the image side, one positive lens and one negative lens, which makes it possible to reduce the weight of the vibration-reduction lens group while achieving achromaticity during vibration reduction. By reducing the weight of the vibration-reduction lens group, it becomes possible to reduce the size and weight of the vibration-reduction actuator.

[0044] In addition, when zooming from the wide-angle end to the telephoto end, the second lens group G2 moves toward the image surface side, the third lens group G3 moves toward the image surface side, and the fourth lens group G4 moves toward the image surface side.

[0045] In a large aperture ratio telephoto zoom lens, the entrance pupil diameter at the telephoto end becomes large, making it difficult to reduce the effective diameter of the lens group on the object side; however, by moving the second lens group G2 to the fourth lens group G4 toward the image plane when changing magnification from the wide-angle end to the telephoto end, the axial light beam diameter from the second lens group G2 to the fourth lens group G4 at the telephoto end can be reduced, making it easier to reduce the lens diameter and weight from the second lens group G2 to the fourth lens group G4.

[0046] The zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions: (6)-0.420<βbW<0.480 βbW: composite magnification of the lens group on the image side of the aperture stop S when focusing on infinity at the wide-angle end

[0047] Condition (6) defines a preferable range for the composite magnification of the lens group on the image side of the aperture stop S when focusing on an object at infinity at the wide-angle end.

[0048] If the upper limit of conditional formula (6) is exceeded and the composite magnification of the lens groups closer to the image side than the aperture diaphragm S when focusing at infinity at the wide-angle end becomes large, the axial light beam diameter of the fourth lens group G4 becomes large, and the effective diameter and weight of the fourth lens group G4 increase. If the lower limit of conditional formula (6) is exceeded and the composite magnification of the lens groups closer to the image side than the aperture diaphragm S when focusing at infinity at the wide-angle end becomes small, it is necessary to strengthen the positive refractive power of the fifth lens group G5 and onwards, which increases the weight and makes it difficult to correct spherical aberration and coma.

[0049] Incidentally, by limiting the lower limit of condition (6) to -0.380 or the upper limit to 0.440, the above-mentioned effect can be ensured more reliably.

[0050] Furthermore, by configuring the sixth lens group G6 to move toward the image surface and the seventh lens group G7 to move toward the object surface when focusing from an object at infinity to a close object, it is possible to suppress fluctuations in spherical aberration and field curvature during focusing.

[0051] The zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions: (7) -2.40 <ff / fr<-0.64 ff: focal length of the sixth lens group G6 fr: focal length of the seventh lens group G7

[0052] Conditional expression (7) defines a preferable range for the ratio of the focal length of the sixth lens group G6 to the focal length of the seventh lens group G7.

[0053] When the ratio of the focal length of the sixth lens group G6 to the focal length of the seventh lens group G7 becomes large beyond the upper limit of the conditional expression (7), the negative refractive power of the sixth lens group G6 becomes strong, the angle between the optical axis of the off-axis light beam emitted from the sixth lens group G6 becomes sharp, and the lens diameters of the seventh lens group G7 and the eighth lens group G8 increase. This increases the weight of the seventh lens group G7 and the weight of the actuator for focusing. Also, if the diameter of the eighth lens group G8 increases, there will be insufficient space to place parts around the lens mount. Alternatively, the positive refractive power of the seventh lens group G7 becomes weak, and the on-axis light beam diameter of the fifth lens group G5 increases, so the weight of the vibration-proof lens group and the vibration-proof actuator increases. If the ratio of the focal length of the sixth lens group G6 to the focal length of the seventh lens group G7 becomes small beyond the lower limit of conditional expression (7), the negative refractive power of the sixth lens group G6 becomes weak, the focus movement amount of the sixth lens group G6 becomes large, and the weight of the focusing actuator becomes heavy, or the positive refractive power of the seventh lens group G7 becomes strong, and various aberrations such as spherical aberration and curvature of field occurring in the seventh lens group G7 become large, making it difficult to satisfactorily correct various aberrations over the entire zoom range and the entire focus range.

[0054] Incidentally, by limiting the lower limit of condition (7) to -2.20 or the upper limit to -0.72, the above-mentioned effect can be ensured more reliably.

[0055] Furthermore, by configuring the sixth lens group G6 to be composed of, in order from the object side to the image side, one positive lens and one negative lens, and the seventh lens group G7 to be composed of one positive lens, the sixth lens group G6 can achromatize while the weight of the focus group can be reduced. The sixth lens group G6 increases the angle between the optical axis of the off-axis light beam and the seventh lens group G7, which increases the effective diameter, but by configuring it to be one positive lens, the weight of the focus group can be reduced. By reducing the weight of the focus group, it is possible to make the focus actuator smaller and lighter.

[0056] Furthermore, the zoom lens according to the present invention is characterized in that it satisfies the following conditional expressions: (8) 0.63 <f1 / fT<1.07 f1: focal length of the first lens group G1 fT: focal length of the entire optical system when focused at infinity at the telephoto end

[0057] Conditional expression (8) defines a preferable range for the ratio of the focal length of the first lens group G1 to the focal length of the entire optical system at the telephoto end when focused on infinity.

[0058] If the upper limit of conditional expression (8) is exceeded and the ratio of the focal length of the first lens group G1 to the focal length of the entire optical system when focusing on infinity at the telephoto end becomes large, the axial light beam diameter of the lens group located closer to the image side than the first lens group G1 increases, which increases the lens diameter of the second lens group G2 and onwards, resulting in an increase in lens weight. If the lower limit of conditional expression (8) is exceeded and the ratio of the focal length of the first lens group G1 to the focal length of the entire optical system when focusing on infinity at the telephoto end becomes small, it becomes difficult to suppress coma aberration at the telephoto end.

[0059] Incidentally, by limiting the lower limit of condition (8) to 0.75 or the upper limit to 0.98, the above-mentioned effect can be ensured more reliably.

[0060] Next, a lens configuration of an embodiment of a large aperture ratio telephoto zoom lens according to the present invention will be described below. Note that in the following description, the lens configuration will be described in order from the object side to the image side.

[0061] In [Surface Data], the surface number is the lens surface or aperture stop number counted from the object side, r is the radius of curvature of each surface, d is the spacing between each surface, nd is the refractive index for the d line (wavelength 587.56 nm), vd is the Abbe number for the d line and PgF is the partial dispersion ratio, which is expressed by the formula PgF = (Ng-NF) / (NF-NC).

[0062] An asterisk (*) next to a surface number indicates that the lens surface is aspheric. BF is the back focus, and the object distance is the distance from the subject to the first lens surface.

[0063] The (diaphragm) next to a surface number indicates that an aperture diaphragm is located at that position. The radius of curvature for the plane or aperture diaphragm is marked as ∞ (infinity).

[0064] [Aspheric Data] shows the coefficient values ​​that give the aspheric shape of lens surfaces marked with an * in [Surface Data]. The shape of the aspheric surface is expressed by the following formula, where y is the displacement from the optical axis in a direction perpendicular to the optical axis, z is the displacement (sag) from the intersection of the aspheric surface and the optical axis in the direction of the optical axis, r is the radius of curvature of the reference sphere, K is the Conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are the aspheric coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, and 20th orders, respectively. TIFF2025043459000002.tif19166

[0065] [Various Data] shows values ​​such as the zoom ratio and focal length at each focal length state.

[0066] [Variable Distance Data] shows the variable distance and BF values ​​for each focal length and shooting distance. The upper row shows values ​​at infinity, and the lower row shows values ​​at close range.

[0067] [Lens Group Data] shows the surface number of each lens group closest to the object and the composite focal length of the entire group.

[0068] In addition, for all of the values ​​of the following specifications, the focal length f, radius of curvature r, lens surface spacing d, and other length units are given in millimeters (mm) unless otherwise specified; however, since the optical system provides equivalent optical performance with proportional magnification and proportional reduction, this is not limited to this.

[0069] In the lens configuration diagrams of the respective embodiments, the arrow indicates the path of the lens group when changing magnification from the wide-angle end to the telephoto end, I is the image plane, FL is an optical filter, and the dashed line passing through the center is the optical axis.

[0070] In the aberration diagrams corresponding to the respective embodiments, d, g, and C represent the d-line, g-line, and C-line, respectively, and ΔS and ΔM represent the sagittal image surface and the meridional image surface, respectively. EXAMPLES

[0071] FIG. 1 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a first embodiment of the present invention.

[0072] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0073] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0074] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0075] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth lens and the fifth lens from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0076] Next, the specifications of the large aperture ratio telephoto zoom lens according to the first embodiment are shown below. Numerical Example 1 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 204.5881 2.0000 1.78590 43.94 0.5612 2 100.7496 8.2048 1.43700 95.10 0.5336 3 -580.7362 0.1870 4 85.9171 8.1450 1.43700 95.10 0.5336 5 -41123.6542 (d5) 6 200.2421 1.5000 1.43700 95.10 0.5336 7 41.4556 (d7) 8 -90.8162 1.1000 1.55032 75.50 0.5401 9 61.0863 2.2411 1.85883 30.00 0.5979 10 111.1309 (d10) 11 49.2382 2.7307 1.87070 40.73 0.5682 12 87.0547 (d12) 13(Aperture) ∞ 1.2010 14* 54.8111 3.6155 1.80610 40.73 0.5694 15 133.7051 0.9441 16 64.7697 1.0500 1.80610 33.27 0.5884 17 27.8690 7.1018 1.43700 95.10 0.5336 18 123138.0915 2.6175 19 -86.3491 2.2798 1.80809 22.76 0.6307 20 -49.4003 1.6900 1.69350 53.20 0.5467 21* 72.9054 1.4361 22 43.1721 8.0877 1.43700 95.10 0.5336 23 -42.3401 1.0500 1.85451 25.15 0.6103 24 -5373.3673 0.8069 25* 71.0779 6.3510 1.76450 49.09 0.5528 26* -51.6774 (d26) 27 -361.8675 2.0048 1.86966 20.02 0.6435 28 -88.3811 0.1500 29 425.0090 0.8000 1.75500 52.32 0.5473 30 31.9317 (d30) 31 52.9222 5.8799 1.65100 56.24 0.5420 32 -93.4360 (d32) 33 -135.9088 1.0000 1.43700 95.10 0.5336 34 55.0218 6.3943 35 -36.6140 1.0000 1.49700 81.61 0.5389 36 -116.6815 29.3510 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 5.73849 -0.04777 A4 -1.70699E-06 -2.05493E-06 -6.68946E-06 5.98132E-07 A6 -9.83571E-10 1.55966E-08 6.52223E-09 3.49487E-09 A8 -1.48085E-12 -2.58234E-10 -4.77660E-11 -2.96468E-11 A10 2.58015E-16 2.85196E-12 1.22707E-13 7.59590E-14 A12 0.00000E+00 -2.04687E-14 -1.23679E-16 -6.84430E-17 A14 0.00000E+00 9.26512E-17 0.00000E+00 0.00000E+00 A16 0.00000E+00 -2.51983E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 3.72342E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -2.27627E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 194.00 F-number 2.91 2.89 2.92 Full angle of view 2ω 32.93 20.01 12.18 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 36.6277 68.5506 d7 16.5679 12.1976 8.0959 d10 39.4276 16.4079 1.0000 d12 23.4999 16.2637 3.8477 d26 9.0036 7.6236 3.0000 d30 11.0632 11.0431 20.0809 d32 6.0146 7.4133 3.0011 BF 1.0000 1.0003 1.0000 Wide Angle Mid-Telephoto d0 778.0034 778.0028 778.0037 d5 2.0000 36.6277 68.5506 d7 16.5679 12.1976 8.0959 d10 39.4276 16.4079 1.0000 d12 23.4999 16.2637 3.8477 d26 10.3220 11.1975 10.8357 d30 8.5288 4.6959 4.8235 d32 7.2305 10.1870 10.4232 BF 0.9999 1.0000 0.9996 [Lens group data] Group Starting plane Focal length G1 1 161.21 G2 6 -119.98 G3 8 -114.18 G4 11 125.95 G5 13 60.26 G6 27 -69.74 G7 31 52.73 G8 33 -47.39 EXAMPLES

[0077] FIG. 17 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a second embodiment of the present invention.

[0078] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0079] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0080] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a convex meniscus lens with its convex surface facing the object side. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0081] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a biconvex lens, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0082] Next, the specifications of the large aperture ratio telephoto zoom lens according to the second embodiment are shown below. Numerical Example 2 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 201.8060 2.0000 1.78590 43.94 0.5612 2 105.8912 7.9804 1.43700 95.10 0.5336 3 -1011.6555 0.1500 4 85.6799 7.8992 1.43700 95.10 0.5336 5 1429.1643 (d5) 6 76.2392 1.5000 1.43700 95.10 0.5336 7 39.5071 (d7) 8 -106.8615 1.1000 1.55032 75.50 0.5401 9 46.3999 2.0369 1.85883 30.00 0.5979 10 64.7231 (d10) 11 47.2558 2.4919 1.87070 40.73 0.5682 12 79.3262 (d12) 13(Aperture) ∞ 1.2000 14* 56.7887 2.3947 1.80610 40.73 0.5694 15 69.4898 0.1500 16 42.6395 1.0500 1.80610 33.27 0.5884 17 27.2874 7.2299 1.43700 95.10 0.5336 18 -2147.7312 2.4306 19 -96.8389 2.0192 1.80809 22.76 0.6307 20 -58.8663 1.6900 1.69350 53.20 0.5467 21* 68.4326 1.0000 22 43.5305 7.7797 1.43700 95.10 0.5336 23 -46.1550 1.0500 1.85451 25.15 0.6103 24 -1917.4093 0.1500 25* 66.4693 6.3689 1.76450 49.09 0.5528 26* -52.4075 (d26) 27 -338.8610 1.9804 1.86966 20.02 0.6435 28 -86.9582 0.1500 29 1077.5821 0.8000 1.75500 52.32 0.5473 30 32.0123 (d30) 31 58.1923 5.7890 1.65100 56.24 0.5420 32 -72.1469 (d32) 33 -407.3581 1.0000 1.43700 95.10 0.5336 34 46.2549 6.7685 35 -31.6244 1.0000 1.49700 81.61 0.5389 36 -120.0951 29.3500 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 4.96457 0.16956 A4 -1.92978E-06 -2.30167E-06 -7.33469E-06 9.33560E-07 A6 -1.13041E-09 1.60528E-08 3.73637E-09 3.87233E-11 A8 -4.14285E-12 -2.79593E-10 -2.02728E-11 -5.76068E-12 A10 2.70122E-15 3.56333E-12 3.96198E-14 1.59399E-14 A12 0.00000E+00 -2.99479E-14 -3.21454E-17 -1.13648E-17 A14 0.00000E+00 1.59267E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -5.13117E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 9.08562E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -6.73031E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 194.00 F-number 2.91 2.88 2.92 Full angle of view 2ω 32.88 19.99 12.19 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 37.2532 74.4490 d7 12.9395 13.3049 7.0327 d10 41.0706 14.4825 1.7781 d12 31.1131 22.0825 3.8635 d26 8.6126 7.3749 3.0000 d30 11.4375 10.2207 18.8143 d32 4.8173 7.2720 3.0531 BF 1.0000 1.0000 1.0001 Wide Angle Mid-Telephoto d0 777.9999 777.9999 777.9999 d5 2.0000 37.2532 74.4490 d7 12.9395 13.3049 7.0327 d10 41.0706 14.4825 1.7781 d12 31.1131 22.0825 3.8635 d26 9.9108 10.8385 10.9847 d30 9.1040 4.3824 4.6119 d32 5.8529 9.6469 9.2710 BF 0.9999 0.9999 0.9999 [Lens group data] Group Starting plane Focal length G1 1 172.14 G2 6 -190.00 G3 8 -84.94 G4 11 129.56 G5 13 55.25 G6 27 -65.06 G7 31 50.36 G8 33 -43.74 EXAMPLES

[0083] FIG. 33 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a third embodiment of the present invention.

[0084] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0085] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0086] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a biconcave lens. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0087] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth lens and the fifth lens from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0088] Next, the specifications of the large aperture ratio telephoto zoom lens according to the third embodiment are shown below. Numerical Example 3 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 156.9796 2.0000 1.78590 43.94 0.5612 2 85.3845 8.5276 1.43700 95.10 0.5336 3 -1980.1722 0.5095 4 85.7751 8.4437 1.43700 95.10 0.5336 5 -1258.1178 (d5) 6 -1191.1375 1.5000 1.43700 95.10 0.5336 7 40.6886 (d7) 8 -118.7428 1.1000 1.55032 75.50 0.5401 9 69.3889 2.1902 1.85883 30.00 0.5979 10 133.3243 (d10) 11 49.0749 2.5818 1.87070 40.73 0.5682 12 81.7816 (d12) 13(Aperture) ∞ 1.2000 14* 56.8046 2.8362 1.80610 40.73 0.5694 15 82.8021 0.1540 16 46.6954 1.0500 1.80610 33.27 0.5884 17 27.3397 7.4980 1.43700 95.10 0.5336 18 1144.4831 2.7367 19 -93.1595 2.4912 1.80809 22.76 0.6307 20 -48.1836 1.6900 1.69350 53.20 0.5467 21* 72.2489 1.0000 22 45.2319 8.4013 1.43700 95.10 0.5336 23 -41.2777 1.0500 1.85451 25.15 0.6103 24 -874.9949 0.1500 25* 68.0171 6.6299 1.76450 49.09 0.5528 26* -54.1161 (d26) 27 -205.2127 1.9496 1.86966 20.02 0.6435 28 -81.2197 0.1500 29 310.4728 0.8000 1.75500 52.32 0.5473 30 33.1845 (d30) 31 58.9542 5.7683 1.65100 56.24 0.5420 32 -86.6040 (d32) 33 -524.3273 1.0000 1.43700 95.10 0.5336 34 61.7221 5.8558 35 -38.9454 1.0000 1.49700 81.61 0.5389 36 -1506.4535 31.0090 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 5.29793 -0.19961 A4 -1.18037E-06 -1.62326E-06 -6.23463E-06 1.15317E-06 A6 -7.10847E-10 1.01656E-08 6.78903E-10 -7.66124E-10 A8 -1.22717E-12 -1.87899E-10 -1.35929E-11 -8.16576E-12 A10 3.16722E-16 2.27920E-12 4.18912E-14 3.85801E-14 A12 0.00000E+00 -1.74565E-14 -8.84319E-17 -8.42177E-17 A14 0.00000E+00 8.30578E-17 0.00000E+00 0.00000E+00 A16 0.00000E+00 -2.35888E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 3.60812E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -2.22973E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 193.99 F-number 2.91 2.88 2.92 Full angle of view 2ω 33.31 20.15 12.23 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 35.4154 64.6108 d7 12.8043 7.2535 7.0717 d10 36.9836 16.7586 1.0000 d12 27.1547 19.5150 6.2600 d26 10.0273 7.9500 3.0000 d30 12.6091 13.2276 22.2846 d32 5.6482 7.1072 3.0000 BF 1.0000 0.9997 1.0001 Wide Angle Mid-Telephoto d0 777.9999 777.9992 777.9992 d5 2.0000 35.4154 64.6108 d7 12.8043 7.2535 7.0717 d10 36.9836 16.7586 1.0000 d12 27.1547 19.5150 6.2600 d26 11.2818 11.3344 10.5321 d30 10.0749 6.9231 7.1010 d32 6.9282 10.0282 10.6524 BF 0.9998 0.9996 1.0000 [Lens group data] Group Starting plane Focal length G1 1 153.22 G2 6 -90.00 G3 8 -150.65 G4 11 135.94 G5 13 59.28 G6 27 -72.57 G7 31 54.74 G8 33 -47.78 EXAMPLES

[0089] FIG. 49 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a fourth embodiment of the present invention.

[0090] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0091] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0092] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0093] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a biconvex lens, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0094] Next, the specifications of the large aperture ratio telephoto zoom lens according to the fourth embodiment are shown below. Numerical Example 4 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 176.7108 2.0000 1.78590 43.94 0.5612 2 92.0437 8.1663 1.43700 95.10 0.5336 3 -1384.7643 0.1500 4 84.4431 8.3627 1.43700 95.10 0.5336 5 -2965.5996 (d5) 6 157.7959 1.5000 1.43700 95.10 0.5336 7 40.3470 (d7) 8 -89.6742 1.1000 1.55032 75.50 0.5401 9 56.1810 2.3442 1.85883 30.00 0.5979 10 104.3669 (d10) 11 48.9642 2.4338 1.87070 40.73 0.5682 12 78.6153 (d12) 13(Aperture) ∞ 1.2000 14* 68.7094 3.2761 1.80610 40.73 0.5694 15 206.7225 0.1500 16 45.5558 1.0500 1.80610 33.27 0.5884 17 25.9058 7.8272 1.43700 95.10 0.5336 18 -286.2087 2.9591 19 -54.3991 2.1796 1.80809 22.76 0.6307 20 -37.9133 1.6900 1.69350 53.20 0.5467 21* 42.1485 1.3854 22 39.6221 8.9207 1.43700 95.10 0.5336 23 -34.3801 1.0500 1.85451 25.15 0.6103 24 -102.4022 0.1500 25* 67.9430 6.6060 1.76450 49.09 0.5528 26* -50.3572 (d26) 27 -327.4415 1.8198 1.86966 20.02 0.6435 28 -104.6612 0.2052 29 723.2376 0.8000 1.75500 52.32 0.5473 30 33.3637 (d30) 31 62.1256 5.9267 1.65100 56.24 0.5420 32 -76.1214 (d32) 33 -335.5838 1.0000 1.43700 95.10 0.5336 34 57.1674 6.8975 35 -35.7010 1.0000 1.49700 81.61 0.5389 36 -175.2937 29.5754 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 4.22311 0.22042 A4 -2.00163E-06 -7.28324E-06 -6.70029E-06 1.96942E-06 A6 7.15624E-10 2.24102E-08 3.82942E-09 9.38305E-10 A8 -3.07423E-12 -3.38708E-10 -2.78774E-11 -1.66936E-11 A10 3.36034E-15 4.18460E-12 7.67070E-14 6.34454E-14 A12 0.00000E+00 -3.43014E-14 -1.73039E-16 -1.61588E-16 A14 0.00000E+00 1.77429E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -5.54891E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 9.49364E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -6.70626E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 194.00 F-number 2.90 2.89 2.92 Full angle of view 2ω 32.83 19.98 12.18 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 35.7305 68.1651 d7 18.1838 13.9806 7.3142 d10 36.5385 14.5563 1.0195 d12 23.7476 16.2027 3.9711 d26 9.0818 7.9500 3.0000 d30 10.6904 10.9187 20.3045 d32 6.5322 7.4356 3.0000 BF 1.0000 1.0000 1.0001 Wide Angle Mid-Telephoto d0 777.9999 777.9998 777.9999 d5 2.0000 35.7305 68.1651 d7 18.1838 13.9806 7.3142 d10 36.5385 14.5563 1.0195 d12 23.7476 16.2027 3.9711 d26 10.6674 12.1218 12.5766 d30 8.2817 4.8602 5.6732 d32 7.3556 9.3225 8.0549 BF 0.9999 1.0000 0.9999 [Lens group data] Group Starting plane Focal length G1 1 159.80 G2 6 -124.53 G3 8 -112.45 G4 11 143.61 G5 13 54.84 G6 27 -63.00 G7 31 53.45 G8 33 -48.34 EXAMPLES

[0095] FIG. 65 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a fifth embodiment of the present invention.

[0096] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0097] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0098] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0099] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens composed of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens composed of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens composed of a biconvex lens and a biconcave lens, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a biconcave lens. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0100] Next, the specifications of the large aperture ratio telephoto zoom lens according to the fifth embodiment are shown below. Numerical Example 5 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 190.8040 2.0000 1.78590 43.94 0.5612 2 97.2122 8.1396 1.43700 95.10 0.5336 3 -1079.8231 0.1500 4 85.8259 8.1873 1.43700 95.10 0.5336 5 -8809.4993 (d5) 6 166.2847 1.5000 1.43700 95.10 0.5336 7 41.7443 (d7) 8 -86.1104 1.1000 1.55032 75.50 0.5401 9 56.7870 2.3270 1.85883 30.00 0.5979 10 103.0047 (d10) 11 49.7437 3.9567 1.87070 40.73 0.5682 12 86.7801 (d12) 13(Aperture) ∞ 1.8739 14* 71.7890 2.5342 1.80610 40.73 0.5694 15 98.1241 0.7796 16 41.0065 1.0500 1.80610 33.27 0.5884 17 25.8495 7.0193 1.43700 95.10 0.5336 18 173.2152 2.5644 19 -209.9109 1.8163 1.80809 22.76 0.6307 20 -105.1120 1.6900 1.69350 53.20 0.5467 21* 138.5998 1.1314 22 59.1552 6.8824 1.43700 95.10 0.5336 23 -50.3974 1.0500 1.85451 25.15 0.6103 24 436.7775 1.3079 25* 66.5236 6.0903 1.76450 49.09 0.5528 26* -60.3904 (d26) 27 -484.4267 2.0133 1.86966 20.02 0.6435 28 -89.5546 0.3641 29 -995.0740 0.8000 1.75500 52.32 0.5473 30 31.7523 (d30) 31 59.8770 5.7824 1.65100 56.24 0.5420 32 -74.1938 (d32) 33 -178.6202 1.0000 1.43700 95.10 0.5336 34 54.4280 6.5626 35 -33.2850 1.0000 1.49700 81.61 0.5389 36 -91.3846 29.3509 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 6.51579 0.68830 A4 -1.62591E-06 -7.75096E-07 -5.17975E-06 1.36145E-06 A6 -1.11376E-09 1.52019E-08 4.56978E-09 3.57072E-09 A8 -7.98113E-13 -3.03658E-10 -5.63651E-11 -3.72868E-11 A10 4.94213E-17 3.83180E-12 1.83409E-13 1.32411E-13 A12 0.00000E+00 -3.10779E-14 -2.73803E-16 -1.94856E-16 A14 0.00000E+00 1.59487E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -4.96723E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 8.52414E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -6.15509E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 117.99 194.00 F-number 2.91 2.89 2.92 Full angle of view 2ω 32.89 20.00 12.18 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 36.5183 70.3704 d7 19.5993 15.1464 7.3965 d10 38.4117 15.0888 1.0320 d12 23.3003 16.5584 4.5122 d26 7.8143 7.1199 3.0000 d30 11.4414 10.6248 19.1652 d32 5.9090 7.4192 3.0000 BF 1.0000 1.0001 0.9998 Wide Angle Mid-Telephoto d0 778.0004 777.9998 778.0002 d5 2.0000 36.5183 70.3704 d7 19.5993 15.1464 7.3965 d10 38.4117 15.0888 1.0320 d12 23.3003 16.5584 4.5122 d26 9.1260 10.6039 10.8371 d30 9.0827 4.7031 4.7018 d32 6.9562 9.8579 9.6268 BF 0.9998 0.9999 0.9995 [Lens group data] Group Starting plane Focal length G1 1 165.36 G2 6 -128.01 G3 8 -107.31 G4 11 127.52 G5 13 55.81 G6 27 -60.60 G7 31 51.78 G8 33 -48.65 EXAMPLES

[0101] FIG. 81 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to the sixth embodiment of the present invention.

[0102] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0103] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0104] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0105] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a biconvex lens, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a biconcave lens, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a biconcave lens. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0106] Next, the specifications of the large aperture ratio telephoto zoom lens according to the sixth embodiment are shown below. Numerical Example 6 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 193.5620 2.0000 1.78590 43.94 0.5612 2 96.2211 8.0485 1.43700 95.10 0.5336 3 -1103.5915 0.1500 4 92.5814 8.1452 1.43700 95.10 0.5336 5 -975.4257 (d5) 6 476.2937 1.5000 1.43700 95.10 0.5336 7 49.6140 (d7) 8 -83.3553 1.1000 1.55032 75.50 0.5401 9 57.5641 2.5195 1.85883 30.00 0.5979 10 119.3003 (d10) 11 44.2599 3.2078 1.87070 40.73 0.5682 12 94.7915 (d12) 13(Aperture) ∞ 1.2000 14* 75.5964 2.6791 1.80610 40.73 0.5694 15 122.9862 0.1500 16 58.3560 1.0500 1.80610 33.27 0.5884 17 27.5151 7.3465 1.43700 95.10 0.5336 18 -1325.7642 2.2853 19 -107.2009 2.0897 1.80809 22.76 0.6307 20 -60.2746 1.6900 1.69350 53.20 0.5467 21* 64.1433 1.9593 22 39.9365 8.0385 1.43700 95.10 0.5336 23 -45.7417 1.0500 1.85451 25.15 0.6103 24 1027.5050 0.2994 25* 65.7095 6.1479 1.76450 49.09 0.5528 26* -54.9509 (d26) 27 -263.1360 1.9850 1.86966 20.02 0.6435 28 -80.2028 0.1500 29 -4085.0749 0.8000 1.75500 52.32 0.5473 30 33.9994 (d30) 31 58.6518 6.0514 1.65100 56.24 0.5420 32 -68.1234 (d32) 33 -64.8750 1.0000 1.43700 95.10 0.5336 34 71.6053 5.3073 35 -41.9427 1.0000 1.49700 81.61 0.5389 36 -197.9339 29.3507 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 4.47665 -0.42208 A4 -1.80853E-06 -2.13531E-06 -6.67327E-06 1.14548E-06 A6 -3.18689E-10 1.68856E-08 -4.17689E-10 -2.70809E-09 A8 -1.10891E-12 -3.44122E-10 9.08677E-12 1.92728E-11 A10 1.14449E-15 4.79633E-12 -8.02533E-14 -9.24500E-14 A12 0.00000E+00 -4.19792E-14 9.99135E-17 1.08250E-16 A14 0.00000E+00 2.27090E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -7.35855E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 1.30270E-21 0.00000E+00 0.00000E+00 A20 0.00000E+00 -9.61220E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 193.99 F-number 2.91 2.87 2.93 Full angle of view 2ω 33.27 20.11 12.20 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 38.0659 71.8375 d7 23.7155 15.3051 6.9195 d10 45.5519 20.9445 1.0000 d12 12.2418 9.1941 3.7523 d26 9.0138 7.9500 3.0000 d30 13.5142 13.1127 20.6898 d32 4.1616 5.6266 3.0000 BF 1.0000 1.0001 1.0000 Wide Angle Mid-Telephoto d0 777.9999 777.9999 777.9999 d5 2.0000 38.0659 71.8375 d7 23.7155 15.3051 6.9195 d10 45.5519 20.9445 1.0000 d12 12.2418 9.1941 3.7523 d26 10.3449 11.5662 11.4101 d30 11.1047 7.0533 6.0262 d32 5.2404 8.0699 9.2535 BF 0.9998 1.0000 0.9999 [Lens group data] Group Starting plane Focal length G1 1 167.76 G2 6 -126.87 G3 8 -118.17 G4 11 92.62 G5 13 65.85 G6 27 -67.60 G7 31 49.34 G8 33 -43.77 EXAMPLES

[0107] FIG. 97 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to the seventh embodiment of the present invention. From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0108] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves toward the image side, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0109] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with a convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with a convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with a convex surface facing the object side.

[0110] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth lens and the fifth lens from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0111] Next, the specifications of the large aperture ratio telephoto zoom lens according to the seventh embodiment are shown below. Numerical Example 7 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 141.2907 2.0000 1.78590 43.94 0.5612 2 78.5442 8.4435 1.43700 95.10 0.5336 3 1360.7267 0.1500 4 84.8004 8.6277 1.43700 95.10 0.5336 5 -1025.9829 (d5) 6 181.1409 1.5000 1.43700 95.10 0.5336 7 37.9941 (d7) 8 -78.3743 1.1000 1.55032 75.50 0.5401 9 66.4524 2.3171 1.85883 30.00 0.5979 10 138.0369 (d10) 11 57.8274 2.1068 1.87070 40.73 0.5682 12 83.6690 (d12) 13(Aperture) ∞ 1.2000 14* 43.9500 4.7623 1.80610 40.73 0.5694 15 200.8178 2.2132 16 58.7301 1.0500 1.80610 33.27 0.5884 17 23.5181 7.1853 1.43700 95.10 0.5336 18 131.9068 3.4301 19 -87.9056 2.4227 1.80809 22.76 0.6307 20 -45.7293 1.6900 1.69350 53.20 0.5467 21* 69.3280 1.0246 22 46.7321 7.8989 1.43700 95.10 0.5336 23 -41.9129 1.0500 1.85451 25.15 0.6103 24 -415.3089 0.1500 25* 62.7044 6.8733 1.76450 49.09 0.5528 26* -50.4340 (d26) 27 -789.9499 1.7989 1.86966 20.02 0.6435 28 -134.0792 0.3883 29 471.8729 0.8000 1.75500 52.32 0.5473 30 33.1060 (d30) 31 70.2158 5.8642 1.65100 56.24 0.5420 32 -68.1983 (d32) 33 -335.2804 1.0000 1.43700 95.10 0.5336 34 59.3390 6.3200 35 -36.1086 1.0000 1.49700 81.61 0.5389 36 -196.0569 29.4378 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 4.60672 -0.09347 A4 -1.10230E-06 -1.86856E-06 -7.38667E-06 6.88676E-07 A6 -9.99562E-10 1.51885E-08 5.16045E-09 2.13286E-09 A8 -5.53302E-13 -3.06851E-10 -4.30823E-11 -2.54086E-11 A10 -9.32887E-16 4.01960E-12 1.16271E-13 6.76309E-14 A12 0.00000E+00 -3.36058E-14 -1.13112E-16 -4.70648E-17 A14 0.00000E+00 1.75562E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -5.49616E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 9.36114E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -6.62538E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 117.98 193.99 F-number 2.89 2.88 2.93 Full angle of view 2ω 32.81 19.99 12.18 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 36.0413 65.8420 d7 20.6835 11.6711 7.9435 d10 20.9485 9.3714 1.0765 d12 35.1953 21.7428 3.9670 d26 9.1811 7.9196 3.0000 d30 9.2674 10.7125 19.8672 d32 7.4198 7.2374 3.0000 BF 1.0000 0.9994 1.0002 Wide Angle Mid-Telephoto d0 777.9999 777.9997 777.9953 d5 2.0000 36.0413 65.8420 d7 20.6835 11.6711 7.9435 d10 20.9485 9.3714 1.0765 d12 35.1953 21.7428 3.9670 d26 10.9092 12.3995 13.3380 d30 6.7704 4.4532 4.7232 d32 8.1889 9.0178 7.8100 BF 0.9999 0.9988 1.0001 [Lens group data] Group Starting plane Focal length G1 1 158.18 G2 6 -110.37 G3 8 -115.91 G4 11 207.17 G5 13 52.66 G6 27 -63.62 G7 31 54.05 G8 33 -48.80 EXAMPLES

[0112] FIG. 113 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to the eighth embodiment of the present invention.

[0113] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0114] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0115] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0116] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a biconcave lens, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0117] Next, the specifications of the large aperture ratio telephoto zoom lens according to the eighth embodiment are shown below. Numerical Example 8 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 161.2612 2.0000 1.78590 43.94 0.5612 2 88.8085 8.0238 1.43700 95.10 0.5336 3 -18769.2950 0.1500 4 90.3783 8.0957 1.43700 95.10 0.5336 5 -1382.9970 (d5) 6 144.5996 1.5000 1.43700 95.10 0.5336 7 40.7167 (d7) 8 -80.0710 1.1000 1.55032 75.50 0.5401 9 59.5137 2.3391 1.85883 30.00 0.5979 10 111.7779 (d10) 11 50.2236 2.6621 1.87070 40.73 0.5682 12 90.2415 (d12) 13(Aperture) ∞ 1.2000 14* 54.3696 2.9919 1.80610 40.73 0.5694 15 85.9140 0.8206 16 50.1227 1.0500 1.80610 33.27 0.5884 17 27.3537 7.4203 1.43700 95.10 0.5336 18 2122.4422 2.5195 19 -100.2250 2.3021 1.80809 22.76 0.6307 20 -53.3746 1.6900 1.69350 53.20 0.5467 21* 65.5912 1.0000 22 44.0378 8.2424 1.43700 95.10 0.5336 23 -41.2416 1.0500 1.85451 25.15 0.6103 24 6098.2869 0.1500 25* 74.3614 5.9569 1.76450 49.09 0.5528 26* -59.1317 (d26) 27 -211.1878 2.0479 1.86966 20.02 0.6435 28 -76.8810 0.1500 29 116.3444 0.8000 1.75500 52.32 0.5473 30 32.4277 (d30) 31 49.8961 5.8423 1.65100 56.24 0.5420 32 -105.7753 (d32) 33 -145.3165 1.0000 1.43700 95.10 0.5336 34 45.5620 6.4429 35 -38.9684 1.0000 1.49700 81.61 0.5389 36 -150.5758 30.1431 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 6.01468 0.14258 A4 -1.28686E-06 -1.93034E-06 -6.39459E-06 4.38571E-07 A6 -6.05676E-10 1.18261E-08 3.05255E-11 -2.00438E-09 A8 -1.72136E-12 -2.32683E-10 4.34344E-12 9.00048E-12 A10 1.07979E-15 3.09902E-12 -3.59040E-14 -3.37262E-14 A12 0.00000E+00 -2.61886E-14 5.26422E-17 4.21672E-17 A14 0.00000E+00 1.38150E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -4.39942E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 7.70257E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -5.65074E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.00 193.99 F-number 2.90 2.88 2.93 Full angle of view 2ω 33.14 20.14 12.25 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 37.5477 68.9276 d7 15.6405 10.2684 7.6702 d10 41.4870 18.2771 1.0000 d12 22.2966 15.3311 3.8261 d26 9.0992 7.6354 3.0000 d30 11.8887 12.2998 21.3855 d32 6.3974 7.4500 3.0000 BF 1.0000 1.0000 1.0000 Wide Angle Mid-Telephoto d0 777.9999 777.9998 777.9999 d5 2.0000 37.5477 68.9276 d7 15.6405 10.2684 7.6702 d10 41.4870 18.2771 1.0000 d12 22.2966 15.3311 3.8261 d26 10.5803 11.6764 12.0032 d30 9.0176 4.9995 3.9515 d32 7.7876 10.7094 11.4310 BF 0.9999 0.9999 0.9998 [Lens group data] Group Starting plane Focal length G1 1 164.65 G2 6 -130.26 G3 8 -106.37 G4 11 126.17 G5 13 72.46 G6 27 -105.71 G7 31 52.86 G8 33 -43.86 EXAMPLES

[0118] FIG. 129 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a ninth embodiment of the present invention.

[0119] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0120] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0121] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0122] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a biconvex lens, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a biconcave lens. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a concave meniscus lens with a convex surface facing the object side and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth and fifth lenses from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0123] Next, the specifications of the large aperture ratio telephoto zoom lens according to the ninth embodiment are shown below. Numerical Example 9 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 187.9800 2.0000 1.78590 43.94 0.5612 2 94.6616 8.1932 1.43700 95.10 0.5336 3 -919.8502 0.1500 4 83.2321 8.4267 1.43700 95.10 0.5336 5 -6249.7235 (d5) 6 194.9554 1.5000 1.43700 95.10 0.5336 7 39.8810 (d7) 8 -89.0379 1.1000 1.55032 75.50 0.5401 9 57.2432 2.3365 1.85883 30.00 0.5979 10 106.5123 (d10) 11 47.8952 2.4851 1.87070 40.73 0.5682 12 76.7883 (d12) 13(Aperture) ∞ 1.2000 14* 61.8479 3.1839 1.80610 40.73 0.5694 15 137.8128 0.1500 16 62.3801 1.0500 1.80610 33.27 0.5884 17 30.1993 7.2818 1.43700 95.10 0.5336 18 -386.7306 2.4180 19 -89.5339 2.2295 1.80809 22.76 0.6307 20 -52.4623 1.6900 1.69350 53.20 0.5467 21* 76.1446 1.0000 22 48.4878 8.0389 1.43700 95.10 0.5336 23 -43.5994 1.0500 1.85451 25.15 0.6103 24 -571.7137 0.9023 25* 66.6207 7.6445 1.76450 49.09 0.5528 26* -44.9262 (d26) 27 -341.2854 1.8600 1.86966 20.02 0.6435 28 -100.1670 1.4619 29 -215.1811 0.8000 1.75500 52.32 0.5473 30 31.8982 (d30) 31 59.9265 5.4081 1.65100 56.24 0.5420 32 -108.3618 (d32) 33 105.5837 1.0000 1.43700 95.10 0.5336 34 47.9091 6.3338 35 -44.7980 1.0000 1.49700 81.61 0.5389 36 -15833.3658 29.9808 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 4.89993 -0.23687 A4 -2.25179E-06 -2.31244E-06 -6.50791E-06 9.81903E-07 A6 -1.59938E-09 2.54535E-08 7.90541E-09 4.60125E-09 A8 -1.75765E-12 -4.67936E-10 -6.74929E-11 -4.80557E-11 A10 -1.07944E-15 5.59227E-12 2.22800E-13 1.72500E-13 A12 0.00000E+00 -4.27844E-14 -3.40005E-16 -2.72466E-16 A14 0.00000E+00 2.06535E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -6.05297E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 9.78144E-22 0.00000E+00 0.00000E+00 A20 0.00000E+00 -6.64836E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.01 193.99 F-number 2.91 2.89 2.92 Full angle of view 2ω 32.84 19.99 12.18 Image height Y 21.63 21.63 21.63 Lens total length 222.00 222.00 222.00 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 36.4744 68.1324 d7 19.8455 13.2866 7.3989 d10 34.6173 15.4078 1.0000 d12 24.1171 15.4130 4.0495 d26 8.4098 6.7494 3.0000 d30 12.7819 11.8574 19.9307 d32 4.8535 7.4388 3.1082 BF 1.0000 0.9995 1.0059 Wide Angle Mid-Telephoto d0 778.0000 777.9983 777.9973 d5 2.0000 36.4744 68.1324 d7 19.8455 13.2866 7.3989 d10 34.6173 15.4078 1.0000 d12 24.1171 15.4130 4.0495 d26 9.7724 10.3944 11.5453 d30 10.7554 6.9578 7.5070 d32 5.5188 8.6971 6.9920 BF 0.9988 0.9958 1.0028 [Lens group data] Group Starting plane Focal length G1 1 159.74 G2 6 -115.07 G3 8 -112.69 G4 11 140.56 G5 13 48.08 G6 27 -48.04 G7 31 60.03 G8 33 -61.22 EXAMPLES

[0124] FIG. 145 is a lens configuration diagram of a large aperture ratio telephoto zoom lens according to a tenth embodiment of the present invention.

[0125] From the object side, it consists of a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with negative refractive power, a fourth lens group G4 with positive refractive power, an aperture stop S, and a subsequent lens group GR consisting of multiple lens groups, which in turn consists of 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.

[0126] During zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed with respect to the image plane, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, the fourth lens group G4 moves toward the image side, the aperture stop S is fixed with respect to the image plane, the fifth lens group G5 is fixed with respect to the image plane, the sixth lens group G6 moves toward the object side, the seventh lens group G7 moves with respect to the image plane, and the eighth lens group G8 is fixed with respect to the image plane. During focusing from an object at infinity to a close object, the sixth lens group G6 moves toward the image side along the optical axis, and the seventh lens group G7 moves toward the object side along the optical axis.

[0127] The first lens group G1 is composed of a cemented lens consisting of a concave meniscus lens with its convex surface facing the object side and a biconvex lens, and a biconvex lens. The second lens group G2 is composed of a concave meniscus lens with its convex surface facing the object side. The third lens group G3 is composed of a cemented lens consisting of a biconcave lens and a convex meniscus lens with its convex surface facing the object side. The fourth lens group G4 is composed of a convex meniscus lens with its convex surface facing the object side.

[0128] The fifth lens group G5 is composed of a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a concave meniscus lens with a convex surface facing the object side and a convex meniscus lens with a convex surface facing the object side, a cemented lens consisting of a convex meniscus lens with a convex surface facing the image side and a biconcave lens, a cemented lens consisting of a biconvex lens and a concave meniscus lens with a convex surface facing the image side, and a biconvex lens. The sixth lens group G6 is composed of a convex meniscus lens with a convex surface facing the image side and a concave meniscus lens with a convex surface facing the object side. The seventh lens group G7 is composed of a biconvex lens. The eighth lens group G8 is composed of a biconcave lens and a concave meniscus lens with a convex surface facing the image side. In this embodiment, vibration reduction is performed by moving the fourth lens and the fifth lens from the object side of the fifth lens group G5 in a direction approximately perpendicular to the optical axis.

[0129] Next, the specifications of the large aperture ratio telephoto zoom lens according to the tenth embodiment are shown below. Numerical Example 10 Unit: mm [Face data] Surface number rd nd vd PgF Object surface ∞ (d0) 1 181.2942 2.0000 1.78590 43.94 0.5612 2 94.9105 8.0831 1.43700 95.10 0.5336 3 -1233.3435 0.1856 4 86.4633 8.2236 1.43700 95.10 0.5336 5 -3047.0924 (d5) 6 170.8177 1.5000 1.55032 75.50 0.5401 7 44.3517 (d7) 8 -85.2992 1.1000 1.59282 68.62 0.5440 9 77.0039 2.2762 1.85451 25.15 0.6103 10 189.2261 (d10) 11 51.3426 2.6924 1.87070 40.73 0.5682 12 93.6733 (d12) 13(Aperture) ∞ 1.2160 14* 52.8112 3.7260 1.80610 40.73 0.5694 15 134.4106 0.5399 16 63.6669 1.0500 1.80610 33.27 0.5884 17 27.1092 7.2701 1.43700 95.10 0.5336 18 967.1595 2.7806 19 -87.5299 2.3283 1.80809 22.76 0.6307 20 -48.9605 1.6900 1.69350 53.20 0.5467 21* 73.0784 1.2154 22 47.1479 8.1226 1.43700 95.10 0.5336 23 -39.3162 1.0500 1.85451 25.15 0.6103 24 -540.9760 0.9596 25* 71.0632 6.6314 1.76450 49.09 0.5528 26* -50.1676 (d26) 27 -605.2833 1.9653 1.86966 20.02 0.6435 28 -103.6006 0.1500 29 462.1732 0.8000 1.75500 52.32 0.5473 30 32.0850 (d30) 31 54.0735 5.8120 1.65100 56.24 0.5420 32 -91.0799 (d32) 33 -572.5013 1.0000 1.43700 95.10 0.5336 34 50.3131 6.6368 35 -34.8919 1.0000 1.49700 81.61 0.5389 36 -213.8124 29.4117 37 ∞ 2.5000 1.51680 64.20 0.5343 38∞(BF) Image plane ∞ [Aspheric data] 14th 21st 25th 26th K 0.00000 0.00000 5.92000 -0.03905 A4 -1.66065E-06 -2.25769E-06 -6.36733E-06 7.31884E-07 A6 -1.03894E-09 2.63370E-08 7.66082E-09 4.21926E-09 A8 -1.37293E-12 -5.10494E-10 -5.39754E-11 -3.39511E-11 A10 1.54808E-16 6.34501E-12 1.40567E-13 9.08068E-14 A12 0.00000E+00 -5.01020E-14 -1.65794E-16 -1.07352E-16 A14 0.00000E+00 2.47738E-16 0.00000E+00 0.00000E+00 A16 0.00000E+00 -7.39129E-19 0.00000E+00 0.00000E+00 A18 0.00000E+00 1.21174E-21 0.00000E+00 0.00000E+00 A20 0.00000E+00 -8.34540E-25 0.00000E+00 0.00000E+00 [Various data] Zoom ratio 2.69 Wide Angle Mid-Telephoto Focal length 72.10 118.02 194.01 F-number 2.91 2.89 2.92 Full angle of view 2ω 32.88 19.99 12.18 Image height Y 21.63 21.63 21.63 Lens total length 221.99 221.99 221.99 [Variable interval data] Wide Angle Mid-Telephoto d0∞∞∞∞ d5 2.0000 36.7199 69.0419 d7 18.2253 12.8027 7.3188 d10 37.6931 15.7093 1.0012 d12 23.4301 16.1162 3.9829 d26 8.8226 7.6585 3.0000 d30 10.8374 10.6564 19.3271 d32 6.0634 7.4088 3.3991 BF 0.9999 0.9996 0.9979 Wide Angle Mid-Telephoto d0 778.0116 778.0105 778.0103 d5 2.0000 36.7199 69.0419 d7 18.2253 12.8027 7.3188 d10 37.6931 15.7093 1.0012 d12 23.4301 16.1162 3.9829 d26 10.2594 11.4276 11.5504 d30 8.3898 4.5205 4.4744 d32 7.0745 9.7776 9.7081 BF 0.9997 0.9990 0.9955 [Lens group data] Group Starting plane Focal length G1 1 161.95 G2 6 -109.32 G3 8 -123.57 G4 11 126.74 G5 13 58.82 G6 27 -67.36 G7 31 52.96 G8 33 -45.27

[0130] The values ​​of the conditional expressions corresponding to the above-mentioned respective embodiments are shown below. [Conditional expression corresponding value] Condition formula / Example EX1 EX2 EX3 EX4 EX5 (1) -1.18 <f2 / fT<-0.37 -0.62 -0.98 -0.46 -0.64 -0.66 (2) -0.94 <f3 / fT<-0.35 -0.59 -0.44 -0.78 -0.58 -0.55 (3) 67.00<νn 85.30 85.30 85.30 85.30 85.30 (4) 0.018<ΔPgFn 0.042 0.042 0.042 0.042 0.042 (5) *1 -1.36 -1.35 -1.36 -2.25 -0.65 (6) -0.420<βbW<0.480 0.047 0.013 -0.030 -0.051 0.016 (7) -2.40 <ff / fr<-0.64 -1.32 -1.29 -1.33 -1.18 -1.17 (8) 0.63 <f1 / fT<1.07 0.83 0.89 0.79 0.82 0.85 *1 is -2.70<(1-βosT)×βRosT<-0.52 Condition formula / Example EX6 EX7 EX8 EX9 EX10 (1) -1.18 <f2 / fT<-0.37 -0.65 -0.57 -0.67 -0.59 -0.56 (2) -0.94 <f3 / fT<-0.35 -0.61 -0.60 -0.55 -0.58 -0.64 (3) 67.00<νn 85.30 85.30 85.30 85.30 72.06 (4) 0.018<ΔPgFn 0.042 0.042 0.042 0.042 0.023 (5) *1 -1.36 -1.36 -1.38 -1.36 -1.36 (6) -0.420<βbW<0.480 0.399 -0.348 0.052 -0.080 0.032 (7) -2.40 <ff / fr<-0.64 -1.37 -1.18 -2.00 -0.80 -1.27 (8) 0.63 <f1 / fT<1.07 0.86 0.82 0.85 0.82 0.83 *1 is -2.70<(1-βosT)×βRosT<-0.52

[0131] <Other embodiments> The technology disclosed in this embodiment is not limited to the above-mentioned embodiment and the description of the embodiment, and various modifications are possible. The shapes and values ​​of each part shown in the above numerical examples are examples for implementing the present technology, and the technical scope of the present technology is not to be interpreted as being limited by them.

[0132] The present technology can also be configured as follows. [Section 1] The optical system comprises, in order from the object side to the image side, a first lens group G1 having a positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, a fourth lens group G4 having a positive refractive power, an aperture stop S, and a subsequent lens group GR made up of a plurality of lens groups. When zooming from the wide-angle end to the telephoto end, the spacing between adjacent lens groups changes. the rear lens group GR has a focusing lens group that moves during focusing from an object at infinity to an object at a close distance, A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1)-1.18 <f2 / fT<-0.37 (2) -0.94 <f3 / fT<-0.35 f2: the focal length of the second lens group G2 fT: focal length of the entire optical system when focused at infinity at the telephoto end f3: the focal length of the third lens group G3 [Section 2] The zoom lens comprises, in order from the object side to the image side, a first lens group G1 having positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, an aperture stop S that is fixed with respect to the image plane during zooming, a fifth lens group G5 having positive refractive power that is fixed with respect to the image plane during zooming, a sixth lens group G6 having negative refractive power, a seventh lens group G7 having positive refractive power, and an eighth lens group G8 having negative refractive power that is fixed with respect to the image plane during zooming. When zooming from the wide-angle end to the telephoto end, the spacing between adjacent lens groups changes. a focusing lens group that is disposed on the image side of the aperture stop S and that moves during focusing from an object at infinity to an object at a close distance; A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1)-1.18 <f2 / fT<-0.37 (2) -0.94 <f3 / fT<-0.35 f2: the focal length of the second lens group G2 fT: focal length of the entire optical system when focused at infinity at the telephoto end f3: the focal length of the third lens group G3 [Section 3] the fifth lens group G5 has a vibration-proof lens group having a negative refractive power that moves in a direction substantially perpendicular to the optical axis during image blur correction; The large aperture ratio telephoto zoom lens according to [Item 2] is characterized in that it satisfies the following conditional expression: (5)-2.70<(1-βosT)×βRosT<-0.52 βosT: The lateral magnification of the vibration-proof lens group when focusing on infinity at the telephoto end βRosT: The lateral magnification of the lens system located on the image side of the image stabilizing lens group when focusing on infinity at the telephoto end [Section 4] The large aperture ratio telephoto zoom lens according to [Item 3], wherein the vibration reduction lens group is composed of, in order from the object side to the image side, one positive lens and one negative lens. [Section 5] During focusing from an object at infinity to an object at a close distance, the sixth lens group G6 moves toward the image side and the seventh lens group G7 moves toward the object side. The large aperture ratio telephoto zoom lens according to any one of [Item 2] to [Item 4], characterized in that the following conditional expressions are satisfied: (7) -2.40 <ff / fr<-0.64 ff: focal length of the sixth lens group G6 fr: focal length of the seventh lens group G7 [Section 6] The large aperture ratio telephoto zoom lens described in any one of [Item 2] to [Item 5], wherein the sixth lens group G6 consists of, in order from the object side to the image side, one positive lens and one negative lens, and the seventh lens group G7 consists of one positive lens. [Section 7] When zooming from the wide-angle end to the telephoto end, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, and the fourth lens group G4 moves toward the image side. The large aperture ratio telephoto zoom lens according to any one of [Item 1] to [Item 6], characterized in that the following conditional expressions are satisfied: (6)-0.420<βbW<0.480 βbW: composite magnification of the lens group on the image side of the aperture stop S when focusing on infinity at the wide-angle end [Section 8] The large aperture ratio telephoto zoom lens according to any one of [Item 1] to [Item 7], characterized in that the following conditional expressions are satisfied: (3) 67.00<νn (4) 0.018<ΔPgFn νn: the average Abbe number of the negative lenses used in the second lens group G2 and the third lens group G3 ΔPgFn: the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3 [Section 9] A large aperture ratio telephoto zoom lens according to any one of [Item 1] to [Item 8], characterized in that the following conditional expressions are satisfied: (8) 0.63 <f1 / fT<1.07 f1: focal length of the first lens group G1 fT: focal length of the entire optical system when focused at infinity at the telephoto end

[0133] Those skilled in the art will recognize various modifications, combinations, subcombinations, and variations depending on design and other factors, and it goes without saying that these are within the scope of the appended claims and their equivalents. [Explanation of symbols]

[0134] G1 First lens group G2 2nd 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 GR subsequent lens group S aperture stop FL Optical Filter I image plane

Claims

1. The zoom lens comprises, in order from the object side to the image side, a first lens group G1 having a positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, a fourth lens group G4 having a positive refractive power, an aperture stop S, and a subsequent lens group GR made up of a plurality of lens groups. When zooming from the wide-angle end to the telephoto end, the spacing between adjacent lens groups changes. the rear lens group GR has a focusing lens group that moves during focusing from an object at infinity to an object at a close distance, A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1) -1.18<f2 / fT<-0.37 (2) -0.94<f3 / fT<-0.35 f2: focal length of the second lens group G2 fT: focal length of the entire optical system when focused on infinity at the telephoto end f3: focal length of the third lens group G3

2. The zoom lens comprises, in order from the object side to the image side, a first lens group G1 having a positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, a fourth lens group G4 having a positive refractive power, an aperture stop S that is fixed with respect to the image plane during zooming, a fifth lens group G5 having a positive refractive power that is fixed with respect to the image plane during zooming, a sixth lens group G6 having a negative refractive power, a seventh lens group G7 having a positive refractive power, and an eighth lens group G8 having a negative refractive power that is fixed with respect to the image plane during zooming. When zooming from the wide-angle end to the telephoto end, the spacing between adjacent lens groups changes. a focusing lens group that is disposed on the image side of the aperture stop S and that moves during focusing from an object at infinity to an object at a close distance; A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1) -1.18<f2 / fT<-0.37 (2) -0.94<f3 / fT<-0.35 f2: focal length of the second lens group G2 fT: focal length of the entire optical system when focused on infinity at the telephoto end f3: focal length of the third lens group G3

3. 3. A large aperture ratio telephoto zoom lens according to claim 1, wherein the following conditional expression is satisfied: (3) 67.00<νn (4) 0.018<ΔPgFn νn: the average value of the Abbe numbers of the negative lenses used in the second lens group G2 and the third lens group G3 ΔPgFn: the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3

4. the fifth lens group G5 has a vibration-proof lens group having a negative refractive power that moves in a direction substantially perpendicular to the optical axis during image blur correction; 3. The large aperture ratio telephoto zoom lens according to claim 2, wherein the following condition is satisfied: (5) -2.70<(1-βosT)×βRosT<-0.52 βosT: lateral magnification of the vibration-proof lens group when focusing on infinity at the telephoto end βRosT: lateral magnification of the lens system located on the image side of the image-stabilizing lens group when focusing on infinity at the telephoto end

5. 5. The large aperture ratio telephoto zoom lens according to claim 4, wherein the vibration reduction lens group comprises, in order from the object side to the image side, one positive lens and one negative lens.

6. When zooming from the wide-angle end to the telephoto end, the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, and the fourth lens group G4 moves toward the image side.

3. A large aperture ratio telephoto zoom lens according to claim 1, wherein the following conditional expression is satisfied: (6) -0.420<βbW<0.480 βbW: composite magnification of the lens group on the image side of the aperture stop S when focusing on infinity at the wide-angle end

7. During focusing from an object at infinity to an object at a close distance, the sixth lens group G6 moves toward the image side and the seventh lens group G7 moves toward the object side.

3. The large aperture ratio telephoto zoom lens according to claim 2, wherein the following condition is satisfied: (7) -2.40<ff / fr<-0.64 ff: focal length of the sixth lens group G6 fr: focal length of the seventh lens group G7

8. 3. The large aperture ratio telephoto zoom lens according to claim 2, wherein the sixth lens group G6 is composed of, in order from the object side to the image side, one positive lens and one negative lens, and the seventh lens group G7 is composed of one positive lens.

9. 3. A large aperture ratio telephoto zoom lens according to claim 1, wherein the following conditional expression is satisfied: (8) 0.63<f1 / fT<1.07 f1: focal length of the first lens group G1 fT: focal length of the entire optical system when focused on infinity at the telephoto end

10. The zoom lens comprises, in order from the object side to the image side, a first lens group G1 having a positive refractive power that is fixed with respect to the image plane during zooming, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, a fourth lens group G4 having a positive refractive power, an aperture stop S that is fixed with respect to the image plane during zooming, a fifth lens group G5 having a positive refractive power that is fixed with respect to the image plane during zooming, a sixth lens group G6 having a negative refractive power, a seventh lens group G7 having a positive refractive power, and an eighth lens group G8 having a negative refractive power that is fixed with respect to the image plane during zooming. The sixth lens group G6 is composed of, in order from the object side to the image side, one positive lens and one negative lens, and the seventh lens group G7 is composed of one positive lens, When zooming from the wide-angle end to the telephoto end, the intervals between the adjacent lens groups change, so that the second lens group G2 moves toward the image side, the third lens group G3 moves toward the image side, and the fourth lens group G4 moves toward the image side. During focusing from an object at infinity to an object at a close distance, the sixth lens group G6 moves toward the image side and the seventh lens group G7 moves toward the object side. the fifth lens group G5 has a vibration-proof lens group having a negative refractive power that moves in a direction substantially perpendicular to the optical axis during image blur correction; The vibration reduction lens group is composed of, in order from the object side to the image side, one positive lens and one negative lens, A large aperture ratio telephoto zoom lens characterized by satisfying the following conditional expressions: (1) -1.18<f2 / fT<-0.37 (2) -0.94<f3 / fT<-0.35 (3) 67.00<νn (4) 0.018<ΔPgFn (5) -2.70<(1-βosT)×βRosT<-0.52 (6) -0.420<βbW<0.480 (7) -2.40<ff / fr<-0.64 (8) 0.63<f1 / fT<1.07 f2: focal length of the second lens group G2 fT: focal length of the entire optical system when focused on infinity at the telephoto end f3: focal length of the third lens group G3 νn: the average value of the Abbe numbers of the negative lenses used in the second lens group G2 and the third lens group G3 ΔPgFn: the average value of the anomalous dispersion of the negative lenses used in the second lens group G2 and the third lens group G3 βosT: lateral magnification of the vibration-proof lens group when focusing on infinity at the telephoto end βRosT: lateral magnification of the lens system located on the image side of the image-stabilizing lens group when focusing on infinity at the telephoto end βbW: composite magnification of the lens group on the image side of the aperture stop S when focusing on infinity at the wide-angle end ff: focal length of the sixth lens group G6 fr: focal length of the seventh lens group G7 f1: focal length of the first lens group G1

Images