Zoom lens system

Claim 2

A zoom lens system comprising a first lens group having a focusing function and positive power, a second lens group movable along the optical axis for zooming, and having a function to vary focal length of said zoom lens system and negative power, third lens group movable along the optical axis for zooming, and having a function mainly for maintaining image position constant and negative power, and a fourth lens group kept fixed and used as an relay lens, said fourth lens group consisting of a front subgroup comprising, in the order from the object side, at least three positive lens component and at least one negative lens component, and rear subgroup comprising two positive lens components, said zoom lens being so designed as to satisfy the following condition (1): -0.15<f.sub.W /f.sub.A <0.5 (1) wherein the reference symbol f W represents the shortest focal length of said zoom lens system and the reference symbol f A designates the total focal length of the system ranging from said first lens group to said front subgroup.

Claim 3

A zoom lens system according to claim 1 wherein said first lens group comprises a cemented doublet consisting of a negative meniscus lens element having a convex surface on the object side and a positive lens element, and a positive meniscus lens component, said zoom lens system being so designed as to satisfy the following conditions (2) through (4): 5.8f.sub.W <f.sub.I <7.8f.sub.W ( 2) 1.25f.sub.W <-f.sub.II <1.85f.sub.W ( 3) 0.58f.sub.I <r.sub.4 <0.79f.sub.I ( 4) wherein the reference symbols f I and f II represent focal lengths of said first and second lens groups respectively, and the reference symbol r 4 designates radius of curvature on the object side surface of the positive meniscus lens component arranged in said first lens group.

Claim 4

A zoom lens system according to claim 2 satisfying the following additional conditions (5) and (6): 1.78<n.sub.IVan ( 5) ν.sub.IVap <ν.sub.IVbp ( 6) wherein the reference symbol n IVan represents refractive index of the negative lens component arranged in the front subgroup of said fourth lens group, the reference symbol ν IVap designates a mean Abbe's number of the positive lens components arranged in the front subgroup of said fourth lens group and the reference symbol ν IVbp denote a mean Abbe's number of the positive lens components arranged in the rear subgroup of said fourth lens group.

Claim 5

A zoom lens system according to claim 1 wherein said second lens group comprises a negative lens component, and a negative cemented doublet comprising a negative lens element and a positive lens element, and said third lens group comprising a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 85.4735 d.sub.1 = 1.8700 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 43.6810 d.sub.2 = 12.7000 n.sub.2 = 1.62041 ν.sub.2 = 60.27 r.sub.3 = -277.9006 d.sub.3 = 0.1500 r.sub.4 = 39.2589 d.sub.4 = 7.2200 n.sub.3 = 1.62041 ν.sub.3 = 60.27 r.sub.5 = 120.0813 d.sub.5 = 2.3617˜19.733˜29.339 r.sub.6 = 95.3684 d.sub.6 = 0.7000 n.sub.4 = 1.72916 ν.sub.4 = 54.68 r.sub.7 = 14.9068 d.sub.7 = 5.5000 r.sub.8 = -21.3833 d.sub.8 = 0.7000 n.sub.5 = 1.69680 ν.sub.5 = 55.52 r.sub.9 = 14.2396 d.sub.9 = 2.7000 n.sub.6 = 1.84666 ν.sub. 6 = 23.88 r.sub.10 = 47.8333 d.sub.10 = 29.7663˜8.055˜2.789 r.sub.11 = -16.6399 d.sub.11 = 1.2000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -41.6382 d.sub.12 = 1.3468˜5.687˜1.347 r.sub.13 = -335.6182 d.sub.13 = 3.2000 n.sub.8 = 1.51454 ν.sub.8 = 54.69 r.sub.14 = -23.9469 d.sub.14 = 0.1000 r.sub.15 = 67.8923 d.sub.15 = 3.2000 n.sub.9 = 1.51454 ν.sub.9 = 54.69 r.sub.16 = -38.1862 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 2.0000 r.sub.18 = 33.5096 d.sub.18 = 3.7618 n.sub.10 = 1.56873 ν.sub.10 = 63.16 r.sub.19 = -204.0980 d.sub.19 = 2.4500 r.sub.20 = -20.1993 d.sub.20 = 1.4443 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = -66.5246 d.sub.21 = 3.5000 r.sub.22 = 112.4502 d.sub.22 = 2.0593 n.sub.12 = 1.84666 ν.sub.12 = 23.88 r.sub.23 = 36.7424 d.sub.23 = 3.8000 r.sub.24 = -165.7742 d.sub.24 = 3.1200 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -26.2172 d.sub.25 = 0.1000 r.sub.26 = 73.7974 d.sub.26 = 4.1400 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = -29.3976 d.sub.27 = 0.1500 r.sub.28 = 23.2052 d.sub.28 = 4.0000 n.sub.15 = 1.48749 ν.sub.15 = 70.15 r.sub.29 = 332.8647 f.sub.W /f.sub.A = -0.02317, f.sub.1 /f.sub.W = 6.964 -f.sub.2 /f.sub.W = 1.363, r.sub.4 /f.sub.1 = 0.7047 n.sub.IVan = 1.80518, ν.sub.IVap -νIVbp = -12.64 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 29 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 28 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 15 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 15 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 6

A zoom lens system according to claim 1 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a positive lens element and a negative lens element, and said third lens group comprises a negative cemented doublet consisting of a negative lens element and a positive lens element, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 68.1165 d.sub.1 = 1.8700 n.sub.1 = 1.78472 ν.sub.1 = 25.71 r.sub.2 = 38.5219 d.sub.2 = 13.5000 n.sub.2 = 1.62041 ν.sub.2 = 60.27 r.sub.3 = 25151.3683 d.sub.3 = 0.1500 r.sub.4 = 42.6858 d.sub.4 = 7.5000 n.sub.3 = 1.62041 ν.sub.3 = 60.27 r.sub.5 = 142.3524 d.sub.5 = 1.3793˜19.410˜29.351 r.sub.6 = 336.5803 d.sub.6 = 1.0000 n.sub.4 = 1.72916 ν.sub.4 = 54.68 r.sub.7 = 16.3280 d.sub.7 = 5.5000 r.sub.8 = -177.3882 d.sub.8 = 3.4000 n.sub.5 = 1.80518 ν.sub.5 = 25.43 r.sub.9 = -20.6994 d.sub.9 = 1.0000 n.sub.6 = 1.72916 ν.sub. 6 = 54.68 r.sub.10 = 32.4097 d.sub.10 = 27.2186˜7.158˜3.850 r.sub.11 = -15.0752 d.sub.11 = 1.0000 n.sub.7 = 1.58913 ν.sub.7 = 60.97 r.sub.12 = 57.9535 d.sub.12 = 2.0000 n.sub.8 = 1.80518 ν.sub.8 = 25.43 r.sub.13 = -156.4333 d.sub.13 = 6.1288˜8.159˜1.526 r.sub.14 = -140.9467 d.sub.14 = 3.2000 n.sub.9 = 1.51112 ν.sub.9 = 60.48 r.sub.15 = -23.2467 d.sub.15 = 0.1000 r.sub.16 = 71.2551 d.sub.16 = 3.2000 n.sub.10 = 1.56873 ν.sub.10 = 63.16 r.sub.17 = -54.0741 d.sub.17 = 5.0000 r.sub.18 = ∞ (stop) d.sub.18 = 2.0000 r.sub.19 = 37.4988 d.sub.19 = 3.7618 n.sub.11 = 1.48749 ν.sub.11 = 70.15 r.sub.20 = -115.2936 d.sub.20 = 2.4500 r.sub.21 = -22.4039 d.sub.21 = 1.4443 n.sub.12 = 1.84666 ν.sub.12 = 23.88 r.sub.22 = -62.0749 d.sub.22 = 3.5000 r.sub.23 = 154.4449 d.sub.23 = 2.0593 n.sub.13 = 1.80518 ν.sub.13 = 25.43 r.sub.24 = 32.4881 d.sub.24 = 3.8000 r.sub.25 = 479.9838 d.sub.25 = 3.1200 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.26 = -31.9806 d.sub.26 = 0.1000 r.sub.27 = 45.2918 d.sub.27 = 4.6400 n.sub.15 = 1.48749 ν.sub.15 = 70.15 r.sub.28 = -28.3955 d.sub.28 = 0.1500 r.sub.29 = 21.7612 d.sub.29 = 3.5000 n.sub.16 = 1.48749 ν.sub.16 = 70.15 r.sub.30 = 75.8496 f.sub.W /f.sub.A = 0.01013, f.sub.1 /f.sub.W = 7.299 -f.sub.2 /f.sub.W = 1.701, r.sub.4 /f.sub.1 = 0.7310 n.sub.IVan = 1.84666, ν.sub.IVap -ν.sub.IVbp = -8.33 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 30 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 29 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 16 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 16 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 7

A zoom lens system according to claim 1 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a negative lens element and a positive lens element, and said third lens group comprises a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 85.2998 d.sub.1 = 1.8700 n.sub.1 = 1.78472 ν.sub.1 = 25.71 r.sub.2 = 38.1383 d.sub.2 = 13.8000 n.sub.2 = 1.62299 ν.sub.2 = 58.14 r.sub.3 = -380.4945 d.sub.3 = 0.1500 r.sub.4 = 39.2209 d.sub.4 = 8.2000 n.sub.3 = 1.65830 ν.sub.3 = 57.33 r.sub.5 = 168.6431 d.sub.5 = 1.0010˜17.792˜26.914 r.sub.6 = 195.2821 d.sub.6 = 0.9000 n.sub.4 = 1.77250 ν.sub.4 = 49.66 r.sub.7 = 13.5082 d.sub.7 = 5.0000 r.sub.8 = -22.5191 d.sub.8 = 1.0000 n.sub.5 = 1.72000 ν.sub.5 = 50.25 r.sub.9 = 13.8588 d.sub.9 = 3.8000 n.sub.6 = 1.80518 ν.sub. 6 = 25.43 r.sub.10 = ∞ d.sub.10 = 26.7092˜7.483˜3.214 r.sub.11 = -22.1011 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -505.3584 d.sub.12 = 4.1308˜6.565˜1.716 r.sub.13 = -83.2775 d.sub.13 = 3.1000 n.sub.8 = 1.51742 ν.sub.8 = 52.41 r.sub.14 = -21.8645 d.sub.14 = 0.1500 r.sub.15 = 78.1851 d.sub.15 = 3.4000 n.sub.9 = 1.51742 ν.sub.9 = 52.41 r.sub.16 = -45.6704 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 1.6000 r.sub.18 = 36.8992 d.sub.18 = 3.4000 n.sub.10 = 1.56883 ν.sub.10 = 56.34 r.sub.19 = -130.9824 d.sub.19 = 2.3000 r.sub.20 = -23.0307 d.sub.20 = 1.2000 n.sub.11 = 1.80610 ν.sub.11 = 40.95 r.sub.21 = -48.7407 d.sub.21 = 7.7297 r.sub.22 = 40.0123 d.sub.22 = 4.2488 n.sub.12 = 1.62041 ν.sub.12 = 60.27 r.sub.23 = -44.8822 d.sub.23 = 0.9950 r.sub.24 = -59.3863 d.sub.24 = 2.0835 n.sub.13 = 1.80518 ν.sub.13 = 25.43 r.sub.25 = 25.8830 d.sub.25 = 2.4035 r.sub.26 = ∞ d.sub.26 = 2.8021 n.sub.14 = 1.51633 ν.sub.14 = 64.15 r.sub.27 = -37.2847 d.sub.27 = 0.1513 r.sub.28 = 138.5316 d.sub.28 = 3.9500 n.sub.15 = 1.62041 ν.sub.15 = 60.27 r.sub.29 = -27.8790 d.sub.29 = 0.1543 r.sub.30 = 22.8642 d.sub.30 = 2.7749 n.sub.16 = 1.51633 ν.sub.16 = 64.15 r.sub.31 = 59.6479 f.sub.W /f.sub.A = 0.04802, f.sub.1 /f.sub.W = 6.516 -f.sub.2 /f.sub.W = 1.463, r.sub.4 /f.sub.1 = 0.7523 n.sub.IVan = 1.80610, ν.sub.IVap -ν.sub.IVbp = -8.49 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 31 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 30 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 16 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 16 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 8

A zoom lens system according to claim 3 wherein said front subgroup of said fourth lens group comprises three positive lens components and a negative lens component, and said rear subgroup comprises a negative lens component and three positive lens components.

Claim 9

A zoom lens system according to claim 7 wherein said negative lens component arranged in said rear subgroup is designed as a air-spaced doublet consisting of a positive lens element and a negative lens component.

Claim 10

A zoom lens system according to claim 3 wherein said front subgroup of said fourth lens group comprises three positive lens components and a negative lens component, and said rear subgroup comprises a positive lens component, a negative lens component and three positive lens components.

Claim 11

A zoom lens system according to claim 9 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a negative lens element and a positive lens element, and said third lens group comprises a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 129.6607 d.sub.1 = 1.8700 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 44.1287 d.sub.2 = 13.0000 n.sub.2 = 1.65160 ν.sub.2 = 58.67 r.sub.3 = -149.8822 d.sub.3 = 0.1500 r.sub.4 = 34.6072 d.sub.4 = 7.3000 n.sub.3 = 1.63930 ν.sub.3 = 44.88 r.sub.5 = 80.9068 d.sub.5 = 2.3623˜19.731˜29.340 r.sub.6 = 58.3741 d.sub.6 = 0.7000 n.sub.4 = 1.72916 ν.sub.4 = 54.68 r.sub.7 = 14.3017 d.sub.7 = 5.5000 r.sub.8 = -18.8888 d.sub.8 = 0.7000 n.sub.5 = 1.69680 ν.sub.5 = 55.52 r.sub.9 = 14.9872 d.sub.9 = 2.7000 n.sub.6 = 1.84666 ν.sub. 6 = 23.88 r.sub.10 = 53.0165 d.sub.10 = 29.7660˜8.056˜2.788 r.sub.11 = -18.2358 d.sub.11 = 1.2000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -52.8345 d.sub.12 = 1.3466˜5.688˜1.346 r.sub.13 = -74.8377 d.sub.13 = 3.2000 n.sub.8 = 1.54072 ν.sub.8 = 47.20 r.sub.14 = -22.4834 d.sub.14 = 0.1000 r.sub.15 = 152.9197 d.sub.15 = 3.2000 n.sub.9 = 1.54072 ν.sub.9 = 47.20 r.sub.16 = -39.3445 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 2.0000 r.sub.18 = 39.6520 d.sub.18 = 4.3000 n.sub.10 = 1.62230 ν.sub.10 = 53.20 r.sub.19 = -57.7570 d.sub.19 = 1.1500 r.sub.20 = -29.3160 d.sub.20 = 1.0000 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = -45.9397 d.sub.21 = 0.1000 r.sub.22 = 24.0615 d.sub.22 = 2.8000 n.sub.12 = 1.51633 ν.sub.12 = 64.15 r.sub.23 = 77.5326 d.sub.23 = 3.0300 r.sub.24 = -27.9904 d.sub.24 = 1.8100 n.sub.13 = 1.80518 ν.sub.13 = 25.43 r.sub.25 = 28.3194 d.sub.25 = 4.3000 r.sub.26 = -93.6370 d.sub.26 = 2.8400 n.sub.14 = 1.51633 ν.sub.14 = 64.15 r.sub.27 = -24.5049 d.sub.27 = 0.1000 r.sub.28 = -2112.8362 d.sub.28 = 4.3000 n.sub.15 = 1.51633 ν.sub.15 = 64.15 r.sub.29 = -19.4015 d.sub.29 = 0.1000 r.sub.30 = 21.4312 d.sub.30 = 3.1000 n.sub.16 = 1.51633 ν .sub.16 = 64.15 r.sub.31 = 122.3414 f.sub.W /f.sub.A = 0.37481, f.sub.1 /f.sub.W = 6.900 -f.sub.2 /f.sub.W = 1.363, r.sub.4 /f.sub.1 = 0.6270 n.sub.IVan = 1.80518, ν.sub.IVap -ν.sub.IVbp = -14.95 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 31 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 30 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 16 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 16 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 12

A zoom lens system according to claim 1 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a negative lens element and a positive lens element, and said third lens group comprises a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 84.5007 d.sub.1 = 1.8700 n.sub.1 = 1.78472 ν.sub.1 = 25.71 r.sub.2 = 38.6265 d.sub.2 = 13.8000 n.sub.2 = 1.62299 ν.sub.2 = 58.14 r.sub.3 = -359.3933 d.sub.3 = 0.1500 r.sub.4 = 37.8232 d.sub.4 = 8.2000 n.sub.3 = 1.62041 ν.sub.3 = 60.27 r.sub.5 = 153.8556 d.sub.5 = 1.0004˜18.066˜27.310 r.sub.6 = 297.3091 d.sub.6 = 0.9000 n.sub.4 = 1.77250 ν.sub.4 = 49.66 r.sub.7 = 13.1817 d.sub.7 = 5.0000 r.sub.8 = -24.5364 d.sub.8 = 1.0000 n.sub.5 = 1.72916 ν.sub.5 = 54.68 r.sub.9 = 12.5119 d.sub.9 = 4.1000 n.sub.6 = 1.80518 ν.sub. 6 = 25.43 r.sub.10 = -382.8361 d.sub.10 = 26.9879˜7.779˜3.319 r.sub.11 = -17.4706 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -83.2942 d.sub.12 = 4.3530˜6.499˜1.716 r.sub.13 = -58.7565 d.sub.13 = 3.5000 n.sub.8 = 1.62230 ν.sub.8 = 53.20 r.sub.14 = -23.1305 d.sub.14 = 0.1500 r.sub.15 = 83.8158 d.sub.15 = 3.5000 n.sub.9 = 1.51742 ν.sub.9 = 52.41 r.sub.16 = -49.0445 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 1.4000 r.sub.18 = 82.7336 d.sub.18 = 3.6000 n.sub.10 = 1.51633 ν.sub.10 = 64.15 r.sub.19 = -63.1310 d.sub.19 = 0.1500 r.sub.20 = 40.0872 d.sub.20 = 3.3989 n.sub.11 = 1.51633 ν.sub.11 = 64.15 r.sub.21 = -252.9334 d.sub.21 = 2.2493 r.sub.22 = -26.3481 d.sub.22 = 1.1206 n.sub.12 = 1.84666 ν.sub.12 = 23.88 r.sub.23 = -134.8965 d.sub.23 = 8.6193 r.sub.24 = 49.2015 d.sub.24 = 1.6583 n.sub.13 = 1.84666 ν.sub.13 = 23.88 r.sub.25 = 26.8478 d.sub.25 = 2.5010 r.sub.26 = -322.1967 d.sub.26 = 2.4268 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = -42.3196 d.sub.27 = 0.1513 r.sub.28 = 102.1009 d.sub.28 = 4.2325 n.sub.15 = 1.51633 ν.sub.15 = 64.15 r.sub.29 = -23.0642 d.sub.29 = 0.1543 ______________________________________

Claim 13

A zoom lens system according to claim 5 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a negative lens element and a positive lens element, and said third lens group comprises a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 83.4999 d.sub.1 = 1.8700 n.sub.1 = 1.78472 ν.sub.1 = 25.71 r.sub.2 = 39.5121 d.sub.2 = 13.8000 n.sub.2 = 1.62299 ν.sub.2 = 58.14 r.sub.3 = -393.4583 d.sub.3 = 0.1500 r.sub.4 = 38.6529 d.sub.4 = 8.2000 n.sub.3 = 1.62041 ν.sub.3 = 60.27 r.sub.5 = 151.0703 d.sub.5 = 1.0304˜18.366˜27.789 r.sub.6 = 204.0839 d.sub.6 = 0.9000 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 12.9841 d.sub.7 = 5.0000 r.sub.8 = -22.3059 d.sub.8 = 1.0000 n.sub.5 = 1.72000 ν.sub.5 = 50.25 r.sub.9 = 13.0696 d.sub.9 = 4.1000 n.sub.6 = 1.80518 ν.sub. 6 = 25.43 r.sub.10 = -167.8960 d.sub.10 = 26.7210˜7.724˜3.300 r.sub.11 = -18.6243 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -188.2149 d.sub.12 = 3.8445˜5.504˜0.518 r.sub.13 = -65.9779 d.sub.13 = 3.4952 n.sub.8 = 1.51112 ν.sub.8 = 60.48 r.sub.14 = -20.4085 d.sub.14 = 0.1500 r.sub.15 = 79.0399 d.sub.15 = 3.5000 n.sub.9 = 1.51742 ν.sub.9 = 52.41 r.sub.16 = -39.7602 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 1.4000 r.sub.18 = 39.8039 d.sub.18 = 3.4000 n.sub.10 = 1.51633 ν.sub.10 = 64.15 r.sub.19 = -87.3157 d.sub.19 = 2.2500 r.sub.20 = -21.4971 d.sub.20 = 1.3542 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = -43.0238 d.sub.21 = 7.4556 r.sub.22 = 50.3713 d.sub.22 = 4.5196 n.sub.12 = 1.78590 ν.sub.12 = 44.18 r.sub.23 = -140.0701 d.sub.23 = 1.3104 n.sub.13 = 1.78472 ν.sub.13 = 25.71 r.sub.24 = 27.3364 d.sub.24 = 2.8253 r.sub.25 = -2773.1584 d.sub.25 = 3.0001 n.sub.14 = 1.51633 ν.sub.14 = 64.15 r.sub.26 = -34.8803 d.sub.26 = 0.1513 r.sub.27 = 92.5212 d.sub.27 = 4.5030 n.sub.15 = 1.51633 ν.sub.15 = 64.15 r.sub.28 = -26.0676 d.sub.28 = 0.1543 r.sub.29 = 21.9704 d.sub.29 = 2.9769 n.sub.16 = 1.51454 ν.sub.16 = 54.69 r.sub.30 = 50.7233 f.sub.W /f.sub.A = 0.01226, f.sub.1 /f.sub.W = 6.731 -f.sub.2 /f.sub.W = 1.608, r.sub.4 /f.sub.1 = 0.7177 n.sub.IVan = 1.80518, ν.sub.IVap -ν.sub.IVbp = -0.4067 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 30 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 29 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 16 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 16 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 14

A zoom lens system according to claim 10 wherein said second lens group comprises a negative lens component, and a negative cemented doublet consisting of a negative, lens element and a positive lens element, and said third lens group comprises a negative lens component, said zoom lens system having the following numerical data: ______________________________________ f = 8˜22.63˜64 ______________________________________ r.sub.1 = 82.6128 d.sub.1 = 1.8700 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 43.6256 d.sub.2 = 12.7000 n.sub.2 = 1.61700 ν.sub.2 = 62.79 r.sub.3 = -330.9077 d.sub.3 = 0.1500 r.sub.4 = 37.4317 d.sub.4 = 7.1000 n.sub.3 = 1.61700 ν.sub.3 = 62.79 r.sub.5 = 103.1788 d.sub.5 = 2.7425˜20.171˜29.717 r.sub.6 = 97.9540 d.sub.6 = 0.7000 n.sub.4 = 1.65160 ν.sub.4 = 58.67 r.sub.7 = 12.8674 d.sub.7 = 5.5000 r.sub.8 = -22.9442 d.sub.8 = 0.7000 n.sub.5 = 1.62041 ν.sub.5 = 60.27 r.sub.9 = 14.4737 d.sub.9 = 2.7000 n.sub.6 = 1.78472 ν.sub. 6 = 25.71 r.sub.10 = 37.1680 d.sub.10 = 30.7735˜9.034˜3.799 r.sub.11 = -14.3232 d.sub.11 = 1.2000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -29.5067 d.sub.12 = 1.3562˜5.667˜1.357 r.sub.13 = -91.9797 d.sub.13 = 3.2000 n.sub.8 = 1.54814 ν.sub.8 = 45.78 r.sub.14 = -21.7629 d.sub.14 = 0.1000 r.sub.15 = 60.5159 d.sub.15 = 3.2000 n.sub.9 = 1.54814 ν.sub.9 = 45.78 r.sub.16 = -49.6982 d.sub.16 = 5.0000 r.sub.17 = ∞ (stop) d.sub.17 = 2.0000 r.sub.18 = 59.0473 d.sub.18 = 3.4000 n.sub.10 = 1.51112 ν.sub.10 = 60.48 r.sub.19 = -128.2891 d.sub.19 = 2.3000 r.sub.20 = -20.0949 d.sub.20 = 2.0000 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = -47.3582 d.sub.21 = 0.1000 r.sub.22 = 64.5174 d.sub.22 = 3.0000 n.sub.12 = 1.51633 ν.sub.12 = 64.15 r.sub.23 = -43.1117 d.sub.23 = 2.6900 r.sub.24 = 49.3303 d.sub.24 = 2.3300 n.sub.13 = 1.80518 ν.sub.13 = 25.43 r.sub.25 = 17.6141 d.sub.25 = 4.0000 r.sub.26 = 79.8356 d.sub.26 = 4.7000 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = -32.9791 d.sub.27 = 0.1000 r.sub.28 = 21.3622 d.sub.28 = 5.1000 n.sub.15 = 1.48749 ν.sub.15 = 70.15 r.sub.29 = -34.3817 f.sub.W /f.sub.A = -0.11727, f.sub.1 /f.sub.W = 7.032 -f.sub.2 /f.sub.W = 1.362, r.sub.4 /f.sub.1 = 0.6654 n.sub.IVan = 1.80518, ν.sub.IVap -ν.sub.IVbp = -19.47 f.sub.B = 0.88f.sub.S ______________________________________ wherein the reference symbols r 1 through r 29 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 28 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 15 denote refractive indices of the respective lens elements, the reference symbols ν 1 through ν 15 represent Abbe's numbers of the respective lens elements, the reference symbol f designates focal length of the zoom lens system as a whole and the reference symbol f B denote back focal distance of the zoom lens system as a whole.

Claim 15

A zoom lens system according to claim 7 wherein said negative lens component arranged in said rear subgroup is designed as a cemented doublet comprising a positive lens element and a negative lens element.

Claim 16

A zoom lens system according to claim 3 wherein said front subgroup of said fourth lens group comprises three positive lens components and a negative lens component, and said rear lens group comprises a positive lens component, a negative lens component and two positive lens components.

Claim 17

A zoom lens system according to claim 3 wherein said front subgroup of said fourth lens group comprises four positive lens components and a negative lens component, and said rear subgroup comprises a negative lens component and three positive lens components.