Large aperture zoom lens system

Claim 2

A large-aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said fourth lens unit consisting of a front subunit comprising a positive lens component, a positive lens component, a biconcave lens component and a positive lens component in the order from object side, and a rear subunit comprising two positive lens components.

Claim 3

A large-aperture zoom lens system according to claim 1 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component, a negative lens component and a positive lens component, whereas said rear subunit comprises a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 84.1276 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.0902 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -273.1915 d.sub.3 = 0.1700 r.sub.4 = 28.7778 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 203.0683 d.sub.5 = 0.6000˜8.838˜14.867 r.sub.6 = 29.7145 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 11.3398 d.sub.7 = 3.9500 r.sub.8 = -21.5403 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 15.9303 d.sub.9 = 3.1000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = 1554.6274 d.sub.10 = 12.9984˜5.073˜2.828 r.sub.11 = -14.7944 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -36.0319 d.sub.12 = 4.9325˜4.598˜0.854 r.sub.13 = 50.3787 d.sub.13 = 2.6753 n.sub.8 = 1.74950 ν.sub.8 = 35.27 r.sub.14 = -29.8033 d.sub.14 = 0.6469 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 20.2193 d.sub.16 = 5.3125 n.sub.9 = 1.69350 ν.sub.9 = 53.23 r.sub.17 = -440.8891 d.sub.17 = 0.8000 r.sub.18 = -25.3662 d.sub.18 = 1.4008 n.sub.10 = 1.84666 ν.sub.10 = 23.88 r.sub.19 = 18.0976 d.sub. 19 = 1.8984 r.sub.20 = 104.9452 d.sub.20 = 3.0000 n.sub.11 = 1.56873 ν.sub.11 = 63.16 r.sub.21 = -33.8872 d.sub.21 = 6.0137 r.sub.22 = -1877.6563 d.sub.22 = 3.6497 n.sub.12 = 1.48749 ν.sub.12 = 70.15 r.sub.23 = -18.1673 d.sub.23 = 0.1342 r.sub.24 = 27.7264 d.sub.24 = 3.3156 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -111.3847 l/f.sub.IV = 1.642, D/f.sub.IV = 0.237, f.sub.W /f.sub.A = -0.221 f.sub.IVa /f.sub.S = 1.186, f.sub.IVan /f.sub.S = -0.507 f.sub.I /f.sub.W = 2.996, f.sub.II /f.sub.W = -1.098, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν .sub.6 = 29.35, n.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -19.597, t.sub.B /f.sub.S ______________________________________ = 0.2928 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the rererence symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's numbers of the respective lens elements.

Claim 4

A large-aperture zoom lens system according to claim 1 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component, a negative lens component and a positive lens component, whereas said rear subunit comprises a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 82.8380 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 28.9584 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -243.9195 d.sub.3 = 0.1700 r.sub.4 = 28.9601 d.sub.4 = 5.6000 n.sub.3 = 1.62374 ν.sub.3 = 47.10 r.sub.5 = 203.8797 d.sub.5 = 0.6000˜8.647˜14.529 r.sub.6 = 29.0358 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 11.4509 d.sub.7 = 3.9500 r.sub.8 = -21.5434 d.sub.8 = 1.0400 n.sub.5 = 1.69680 ν.sub.5 = 55.52 r.sub.9 = 16.1419 d.sub.9 = 3.1000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = 327.0857 d.sub.10 = 12.7201˜4.953˜2.849 r.sub.11 = -15.1829 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -38.3036 d.sub.12 = 4.8880˜4.594˜0.854 r.sub.13 = 50.2085 d.sub.13 = 2.6726 n.sub.8 = 1.76200 ν.sub.8 = 40.10 r.sub.14 = -29.8907 d.sub.14 = 0.6433 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 20.1914 d.sub.16 = 5.5367 n.sub.9 = 1.69680 ν.sub.9 = 55.52 r.sub.17 = 2178.6990 d.sub.17 = 0.8000 r.sub.18 = -25.1867 d.sub.18 = 1.4025 n.sub.10 = 1.84666 ν.sub.10 = 23.88 r.sub.19 = 18.2541 d.sub. 19 = 1.8967 r.sub.20 = 89.3959 d.sub.20 = 3.0000 n.sub.11 = 1.62041 ν.sub.11 = 60.27 r.sub.21 = -41.7577 d.sub.21 = 6.1391 r.sub.22 = -2160.7673 d.sub.22 = 3.6490 n.sub.12 = 1.56873 ν.sub.12 = 63.16 r.sub.23 = -20.1024 d.sub.23 = 0.1342 r.sub.24 = 28.7875 d.sub.24 = 3.3002 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -98.5889 l/f.sub.IV = 1.752, D/f.sub.IV = 0.258, f.sub.W /f.sub.A = -0.253 f.sub.IVa /f.sub.S = 1.180, f.sub.IVan /f.sub.S = -0.508 f.sub.I /f.sub.W = 2.951, f.sub.II /f.sub.W = -1.068, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.14986, n.sub.5 = 1.69680 ν.sub.5 - ν.sub.6 = 31.64, n.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -14.692, t.sub.B /f.sub.S ______________________________________ = 0.2921 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's nubmers of the respective lens elements.

Claim 5

A large-aperture zoom lens system according to claim 1 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component, a negative lens component and a positive lens component, whereas said rear subunit comprises a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 83.0383 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.1400 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -253.1450 d.sub.3 = 0.1700 r.sub.4 = 28.6874 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 210.2929 d.sub.5 = 0.6000˜8.638˜14.534 r.sub.6 = 30.3630 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 11.3638 d.sub.7 = 3.9500 r.sub.8 = -21.4761 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 17.0207 d.sub.9 = 3.1000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = 1069.1825 d.sub.10 = 13.0418˜5.272˜2.789 r.sub.11 = -14.1675 d.sub.11 = 1.0000 n.sub.7 = 1.69670 ν.sub.7 = 55.52 r.sub.12 = -36.2700 d.sub.12 = 4.5289˜4.243˜0.854 r.sub.13 = 55.6389 d.sub.13 = 2.6729 n.sub.8 = 1.74950 ν.sub.8 = 35.27 r.sub.14 = -31.9536 d.sub.14 = 0.6353 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 21.0858 d.sub.16 = 5.0173 n.sub.9 = 1.69350 ν.sub.9 = 53.23 r.sub.17 = -708.9650 d.sub.17 = 0.8000 r.sub.18 = -27.0343 d.sub.18 = 1.4021 n.sub.10 = 1.84666 ν.sub.10 = 23.88 r.sub.19 = 19.1950 d.sub.19 = 1.9053 r.sub.20 = 45.3739 d.sub.20 = 3.0000 n.sub.11 = 1.65873 ν.sub.11 = 63.16 r.sub.21 = -24.8871 d.sub.21 = 6.6760 r.sub.22 = -119.5541 d.sub.22 = 3.6491 n.sub.12 = 1.48749 ν.sub.12 = 70.15 r.sub.13 = -20.3750 d.sub.13 = 0.1342 r.sub.24 = 28.5509 d.sub.24 = 3.3004 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -144.4908 l/f.sub.IV = 1.863, D/f.sub.IV = 0.296, f.sub.W /f.sub.A = -0.016 f.sub.IVa /f.sub.S = 1.071, f.sub.IVan /f.sub.S = -0.539 f.sub.I /f.sub.W = 2.939, f.sub.II /f.sub.W = -1.071, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν.sub.6 = 29.35, f.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -19.597, t.sub.B /f.sub.S ______________________________________ = 0.2921 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's nubmers of the respective lens elements.

Claim 6

A large-aperture zoom lens system according to claim 1 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component, a negative lens component and a positive lens component, whereas said rear subunit comprises a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 82.6129 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.2181 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -246.0953 d.sub.3 = 0.1700 r.sub.4 = 28.4664 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 217.2658 d.sub.5 = 0.6000˜8.516˜14.296 r.sub.6 = 34.0022 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 11.4972 d.sub.7 = 3.9500 r.sub.8 = -20.9945 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 16.3829 d.sub.9 = 3.1000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = 646.6454 d.sub.10 = 12.8886˜5.006˜2.865 r.sub.11 = -14.2623 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -30.9806 d.sub.12 = 4.5293˜4.484˜0.854 r.sub.13 = 50.7675 d.sub.13 = 2.6656 n.sub.8 = 1.74950 ν.sub.8 = 35.27 r.sub.14 = -30.6539 d.sub.14 = 0.5921 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 19.1840 d.sub.16 = 4.5518 n.sub.9 = 1.69350 ν.sub.9 = 53.23 r.sub.17 = 3649.8366 d.sub.17 = 0.8000 r.sub.18 = -24.4207 d.sub.18 = 1.4073 n.sub.10 = 1.84666 ν.sub.10 = 23.88 r.sub.19 = 18.4904 d.sub. 19 = 3.8044 r.sub.20 = 80.9804 d.sub.20 = 3.0000 n.sub.11 = 1.56873 ν.sub.11 = 63.16 r.sub.21 = -23.6744 d.sub.21 = 4.3200 r.sub.22 = -81.0091 d.sub.22 = 3.6442 n.sub.12 = 1.48749 ν.sub.12 = 70.15 r.sub.23 = -19.6764 d.sub.23 = 0.1342 r.sub.24 = 28.3524 d.sub.24 = 3.3101 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -150.6774 l/f.sub.IV = 1.771, D/f.sub.IV = 0.184, f.sub.W /f.sub.A = 0.010 f.sub.IVa /f.sub.S = 1.095, f.sub.IVan /f.sub.S = -0.505 f.sub.I /f.sub.W = 2.894, f.sub.II /f.sub.W = -1.021, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350, ν.sub.5 - ν.sub. 6 = 29.35, n.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -19.597, t.sub.B /f.sub.S ______________________________________ = 0.2923 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's numbers of the respective lens elements.

Claim 7

A large aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said fourth lens unit consisting of a front subunit comprising a positive lens component, a positive lens component and a negative lens component having an object side surface with a radius of curvature smaller than the radius of curvature on the image side surface, and a rear subunit comprising a negative lens component having an image side surface with a radius of curvature smaller than the radius of curvature on the object side surface and two positive lens components.

Claim 8

A large aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said fourth lens unit consisting of a front subunit comprising a positive lens component, a positive lens component and a negative lens component having an object side surface with a radius of curvature smaller than the radius of curvature on the image side surface, and a rear subunit comprising a negative lens component having an image side surface with a radius of curvature smaller than the radius of curvature on the object side surface and two positive lens components.

Claim 9

A large-aperture zoom lens system according to claim 6 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component and a negative lens component, whereas said rear subunit comprises a negative lens component, a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 73.7446 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.0371 d.sub.2 = 7.3000 n.sub.2 = 1.62280 ν.sub.2 = 57.06 r.sub.3 = -142.5789 d.sub.3 = 0.1700 r.sub.4 = 29.7376 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 187.5263 d.sub.5 = 0.6000˜8.158˜13.563 r.sub.6 = 761.2471 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 12.6032 d.sub.7 = 3.9500 r.sub.8 = -19.9311 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 14.4310 d.sub.9 = 3.1000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = -537.6964 d.sub.10 = 14.1628˜4.601˜3.099 r.sub.11 = -23.9031 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -49.2275 d.sub.12 = 2.7690˜4.810˜0.854 r.sub.13 = 83.5278 d.sub.13 = 2.6697 n.sub.8 = 1.73400 ν.sub.8 = 51.49 r.sub.14 = -26.0628 d.sub.14 = 0.6362 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 22.6911 d.sub.16 = 3.1050 n.sub.9 = 1.69680 ν.sub.9 = 55.52 r.sub.17 = 205.0173 d.sub.17 = 1.2990 r.sub.18 = -23.8698 d.sub.18 = 1.0000 n.sub.10 = 1.85666 ν.sub.10 = 23.88 r.sub.19 = - 199.2548 d.sub.19 = 8.6005 r.sub.20 = 152.2247 d.sub.20 = 1.0000 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = 26.2448 d.sub.21 = 1.9319 r.sub.22 = 120.3715 d.sub.22 = 4.7975 n.sub.12 = 1.56873 ν.sub.12 = 63.16 r.sub.23 = -19.9767 d.sub.23 = 0.1342 r.sub.24 = 23.9392 d.sub.24 = 4.6311 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -72.0532 l/f.sub.IV = 1.826, D/f.sub.IV = 0.346, f.sub.W /f.sub.A = 0.057 f.sub.I /f.sub.W = 2.717, f.sub.II /f.sub.W = -0.851, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν.sub.6 = 29.35, n.sub.IVn = 1.82592, ν.sub.IVap - ν.sub.IVbp = -13.15, f.sub.B = 0.95f.sub.S ______________________________________ wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's numbers of the respective lens elements.

Claim 10

A large-aperture zoom lens system according to claim 6 wherein said front subunit of said fourth lens unit comprises a positive lens component, a positive lens component and a negative lens component, whereas said rear subunit comprises a negative lens component, a positive lens component, a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 73.4599 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.7582 d.sub.2 = 7.3000 n.sub.2 = 1.62280 ν.sub.2 = 57.06 r.sub.3 = -143.3946 d.sub.3 = 0.1700 r.sub.4 = 29.8304 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 193.5783 d.sub.5 = 0.6000˜8.068˜13.415 r.sub.6 = -249.6054 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 13.4290 d.sub.7 = 3.9500 r.sub.8 = -22.3190 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 13.6545 d.sub.9 = 3.1000 n.sub. 6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = 395.1326 d.sub.10 = 13.8889˜4.363˜3.225 r.sub.11 = -29.6120 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -74.5434 d.sub.12 = 3.0371˜5.106˜0.854 r.sub.13 = 103.8661 d.sub.13 = 2.6656 n.sub.8 = 1.72916 ν.sub.8 = 54.68 r.sub.14 = -26.8147 d.sub.14 = 0.5983 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 24.1544 d.sub.16 = 3.7803 n.sub.9 = 1.69680 ν.sub.9 = 55.52 r.sub.17 = 586.5944 d.sub.17 = 1.2984 r.sub.18 = -21.4118 d.sub.18 = 1.0000 n.sub.10 = 1.84666 ν.sub.10 = 23.88 r.sub.19 = - 175.5530 d.sub.19 = 6.6556 r.sub.20 = 78.7259 d.sub.20 = 1.0000 n.sub.11 = 1.80518 ν.sub.11 = 25.43 r.sub.21 = 33.7443 d.sub.21 = 1.9815 r.sub.22 = -76.7912 d.sub.22 = 3.8000 n.sub.12 = 1.48749 ν.sub.12 = 70.15 r.sub.23 = -17.6494 d.sub.23 = 0.1342 r.sub.24 = 51.5682 d.sub.24 = 3.0000 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -54.5234 d.sub.25 = 0.1500 r.sub.26 = 33.6811 d.sub.26 = 3.7439 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = 306.4734 l/f.sub.IV = 1.907, D/f.sub.IV = 0.284, f.sub.W /f.sub.A = -0.078 f.sub.I /f.sub.W = 2.696, f.sub.II /f.sub.W = -0.844, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν.sub.6 = 29.35, n.sub.IVn = 1.82592 ν.sub.IVap - ν.sub.IVbp = -15.05, f.sub.B = 0.95f.sub.S ______________________________________ wherein the reference symbols r 1 through r 27 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 26 designate thicknesses of the respective lens elements and airspaces reversed therebetween, the reference symbols n 1 through n 14 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 14 represent Abbe's numbers of the rspective lens elements.

Claim 11

A large-aperture zoom lens system according to claim 1 wherein distance l as measured from the rear focal point of said zoom lens system as a whole to the rear principal point of the negative lens component arrange in the most image side of the front subunit of said fourth lens unit satisfies the following condition (1): 1.5f.sub.IV <l<2.2f.sub.IV ( 1) wherein the reference symbol f IV represents focal length of said fourth lens unit.

Claim 12

A large-aperture zoom lens system according to claim 9 wherein airspace D reserved between the front and rear subunits in said fourth lens unit satisfies the following condition (2): 0.14f.sub.IV <D<0.5f.sub.IV ( 2).

Claim 13

A large-aperture zoom lens system according to claim 10 wherein the system ranging from said first lens unit to the front subunit of said fourth lens unit forms a nearly afocal system, said zoom lens system being so designed as to satisfy the following condition (3): -0.3<f.sub.W /f.sub.A <0.3 (3) wherein the reference symbol f W represents the shortest focal length of said zoom lens system as a whole and the reference symbol f A designates total focal length of the system ranging from said first lens unit to said fourth lens unit.

Claim 14

A large-aperture zoom lens system according to claim 11 satisfying the following conditions (4) and (5): 2.5f.sub.W <f.sub.I <3.5f.sub.W ( 4) -1.2f.sub.W <f.sub.II <-0.8f.sub.W ( 5) wherein the reference symbol f I represents focal length of said first lens unit and the reference symbol f II designates focal length of said second lens unit.

Claim 15

A large-aperture zoom lens system according to claim 11 so adapted as to be focused on an object located at a very short distance by shifting the rear subunit of said fourth lens unit.

Claim 16

A large-aperture zoom lens system according to claim 13 satisfying the following conditions (12) through (14): 0.5f.sub.S <f.sub.IVa <1.6f.sub.S ( 12) 0.42f.sub.S <|f.sub.IVan |<0.64f.sub.S ( 13) t.sub.B <0.45f.sub.S ( 14) wherein the reference symbol f IVa represents focal length of the front subunit of said fourth lens group, the reference symbol f IVan designates focal length of the negative lens component arranged in said front subunit, the reference symbol f S denotes a geometrical mean of the shortest focal length and the longest focal length of said zoom lens system as a whole, and the reference symbol t B represents distance as measured from the extreme object side surface to the extreme image side surface of the rear subunit of said fourth lens unit.

Claim 17

A large-aperture zoom lens system according to claim 12 wherein said first lens unit comprises a positive cemented doublet comprising a negative meniscus lens element and a biconvex lens element, and a positive meniscus lens component, said second lens unit comprises a negative meniscus lens component, and a negative cemented doublet comprising a biconcave lens element and a positive lens element, and said third lens unit comprises a negative lens component, said zoom lens system being so designed as to satisfy the following conditions (6) through (9): 1.7<n.sub.4 ( 6) 0.05<n.sub.6 -n.sub.5 ( 7) 1.6<n.sub.5 ( 8) 13<ν.sub.5 -ν.sub.6 ( 9) wherein the reference symbol n 4 represents refractive index of the negative meniscus lens component arranged in said second lens unit, the reference symbols n 5 and n 6 designate refractive indices of the biconcave lens element and positive lens element respectively of the cemented doublet arranged in said second lens unit, and the reference symbols ν 5 and ν 6 denote Abbe's numbers of the biconcave lens element and positive lens element of the cemented doublet arranged in said second lens unit.

Claim 18

A large-aperture zoom lens system according to claim 15 satisfying the following conditions (10) and (11): 1.78<n.sub.IVn ( 10) ν.sub.IVap <ν.sub.IVbp ( 11) wherein the reference symbol n IVn represents a mean refractive index of the negative lens components arranged in said fourth lens unit, the reference symbol ν IVap designates a mean Abbe's number of the positive lens components arranged in the front subunit of said fourth lens unit and the reference symbol ν IVbp denotes a mean Abbe's number of the positive lens components arranged in the rear subgroup of said fourth lens unit.

Claim 19

A large-aperture zoom lens system according to claim 16 so adapted as to be focused on an object located at a very short distance by shifting the rear subunit of said fourth lens unit.

Claim 20

A larger aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said first lens unit comprising a positive cemented doublet comprising a negative meniscus lens element and a biconvex lens element, and a positive meniscus lens component, said second lens unit comprising a negative meniscus lens component, and a negative cemented doublet comprising a biconcave lens element and a positive lens element, said third lens unit comprises a negative lens component and said fourth lens unit consisting of a front sub-unit comprising a positive lens component, a positive lens component, a positive lens component and a negative lens component, and a rear sub-unit comprising a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 145.4589 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 28.8038 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -124.4191 d.sub.3 = 0.1700 r.sub.4 = 28.0380 d.sub.4 = 5.6000 n.sub.4 = 1.62045 ν.sub.3 = 38.12 r.sub.5 = 194.2344 d.sub.5 = 0.6000˜9.404˜16.075 r.sub.6 = 27.2667 d.sub.6 = 1.0400 n.sub.4 = 1.78590 ν.sub.4 = 44.18 r.sub.7 = 10.3892 d.sub.7 = 3.9500 r.sub.8 = -15.8056 d.sub.8 = 1.0400 n.sub.5 = 1.70154 ν.sub.5 = 41.21 r.sub.9 = 13.5487 d.sub.9 = 3.4000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = -92.7796 d.sub.10 = 17.4871˜8.204˜2.434 r.sub.11 = -11.9646 d.sub.11 = 1.0000 n.sub.7 = 1.71300 ν.sub.7 = 53.84 r.sub.12 = -42.5665 d.sub.12 = 1.2558˜1.725˜0.855 r.sub.13 = -85.6664 d.sub.13 = 2.7002 n.sub.8 = 1.59270 ν.sub.8 = 35.29 r.sub.14 = -17.9449 d.sub.14 = 0.8553 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 21.1736 d.sub.16 = 4.5115 n.sub.9 = 1.62230 ν.sub.9 = 53.20 r.sub.17 = -27.2639 d.sub.17 = 0.2100 r.sub.18 = 14.3135 d.sub.18 = 3.1600 n.sub.10 = 1.51742 ν.sub.10 = 52.41 r.sub.19 = 115.7820 d.sub.19 = 1.2000 r.sub.20 = -25.5498 d.sub.20 = 1.6617 n.sub.11 = 1.84666 ν.sub.11 = 23.88 r.sub.21 = 15.2150 d.sub.21 = 8.5579 r.sub.22 = 2332.0237 d.sub.22 = 4.2478 n.sub.12 = 1.51112 ν.sub.12 = 60.48 r.sub.23 = -20.8501 d.sub.23 = 0.1342 r.sub.24 = 33.8590 d.sub.24 = 4.6445 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -61.6882 l/f.sub.IV = 1.852, D/f.sub.IV = 0.385, f.sub.W /f.sub.A = -0.197 f.sub.IVa /f.sub.S = 0.667, f.sub.IVan /f.sub.S = -0.456 f.sub.I /f.sub.W = 3.061, f.sub.II /f.sub.W = -0.999, n.sub.4 = 1.78590 n.sub.6 - n.sub.5 = 0.14512, n.sub.5 = 1.70154, ν.sub.5 - ν.sub.6 = 17.33, n.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -18.348, t.sub.B /f.sub.S ______________________________________ = 0.3722 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's numbers of the respective lens elements.

Claim 21

A larger aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said first lens unit comprising a positive cemented doublet comprising a negative meniscus lens element and a biconvex lens element, and a positive meniscus lens component, said second lens unit comprising a negative meniscus lens component, and a negative cemented doublet comprising a biconcave lens element and a positive lens element, said third lens unit comprises a negative lens component and said fourth lens unit consisting of a front sub-unit comprising a positive lens component, a positive lens component, a positive lens component and a negative lens component, and a rear sub-unit comprising a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 145.4589 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 28.8038 d.sub.2 = 7.3000 n.sub.2 = 1.62012 ν.sub.2 = 49.66 r.sub.3 = -124.4191 d.sub.3 = 0.1700 r.sub.4 = 28.0380 d.sub.4 = 5.6000 n.sub.4 = 1.62045 ν.sub.3 = 38.12 r.sub.5 = 194.2344 d.sub.5 = 0.6000˜9.404˜16.075 r.sub.6 = 27.2667 d.sub.6 = 1.0400 n.sub.4 = 1.78590 ν.sub.4 = 44.18 r.sub.7 = 10.3892 d.sub.7 = 3.9500 r.sub.8 = -15.8056 d.sub.8 = 1.0400 n.sub.5 = 1.70154 ν.sub.5 = 41.21 r.sub.9 = 13.5487 d.sub.9 = 3.4000 n.sub.6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = -92.7796 d.sub.10 = 17.4871˜8.204˜2.434 r.sub.11 = -11.9646 d.sub.11 = 1.0000 n.sub.7 = 1.71300 ν.sub.7 = 53.84 r.sub.12 = -42.5665 d.sub.12 = 1.2558˜1.725˜0.855 r.sub.13 = -85.6664 d.sub.13 = 2.7002 n.sub.8 = 1.59270 ν.sub.8 = 35.29 r.sub.14 = -17.9449 d.sub.14 = 0.8553 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 21.1736 d.sub.16 = 4.5115 n.sub.9 = 1.62230 ν.sub.9 = 53.20 r.sub.17 = -27.2639 d.sub.17 = 0.2100 r.sub.18 = 14.3135 d.sub.18 = 3.1600 n.sub.10 = 1.51742 ν.sub.10 = 52.41 r.sub.19 = 115.7820 d.sub.19 = 1.2000 r.sub.20 = -25.5498 d.sub.20 = 1.6617 n.sub.11 = 1.84666 ν.sub.11 = 23.88 r.sub.21 = 15.2150 d.sub.21 = 8.5579 r.sub.22 = 2332.0237 d.sub.22 = 4.2478 n.sub.12 = 1.51112 ν.sub.12 = 60.48 r.sub.23 = -20.8501 d.sub.23 = 0.1342 r.sub.24 = 33.8590 d.sub.24 = 4.6445 n.sub.13 = 1.48749 ν.sub.13 = 70.15 r.sub.25 = -61.6882 l/f.sub.IV = 1.852, D/f.sub.IV = 0.385, f.sub.W /f.sub.A = -0.197 f.sub.IVa /f.sub.S = 0.667, f.sub.IVan /f.sub.S = -0.456 f.sub.I /f.sub.W = 3.061, f.sub.II /f.sub.W = -0.999, n.sub.4 = 1.78590 n.sub.6 - n.sub.5 = 0.14512, n.sub.5 = 1.70154, ν.sub.5 - ν.sub.6 = 17.33, n.sub.IVn = 1.84666, f.sub.B = 23.3 ν.sub.IVap - ν.sub.IVbp = -18.348, t.sub.B /f.sub.S ______________________________________ = 0.3722 wherein the reference symbols r 1 through r 25 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 24 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 13 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 13 represent Abbe's numbers of the respective lens elements.

Claim 22

A large aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said first lens unit comprises a positive cemented doublet comprising a negative meniscus lens element and a biconvex lens element, and a positive meniscus lens component, said second lens unit comprising a negative meniscus lens component, and a negative cemented doublet comprising a biconcave lens element and a positive lens element, said third lens unit comprising a negative lens component, and said fourth lens unit consisting of a front sub-unit comprising a positive lens component, a positive lens component and a negative lens component, and a rear sub-unit comprising a negative lens component, a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 73.1407 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.2813 d.sub.2 = 7.3000 n.sub.2 = 1.62280 ν.sub.2 = 57.06 r.sub.3 = -142.5699 d.sub.3 = 0.1700 r.sub.4 = 29.4855 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 188.5203 d.sub.5 = 0.6000˜8.038˜13.370 r.sub.6 = -2148.9531 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 12.7344 d.sub.7 = 3.9500 r.sub.8 = -19.2458 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 14.4976 d.sub.9 = 3.1000 n.sub. 6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = -336.4032 d.sub.10 = 14.0324˜5.201˜2.643 r.sub.11 = -21.0833 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -51.2968 d.sub.12 = 2.3119˜3.735˜0.854 r.sub.13 = 103.8053 d.sub.13 = 2.6678 n.sub.8 = 1.72916 ν.sub.8 = 54.68 r.sub.14 = -34.5149 d.sub.14 = 0.6169 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 52.1018 d.sub.16 = 3.3386 n.sub.9 = 1.69680 ν.sub.9 = 55.52 r.sub.17 = -58.1766 d.sub.17 = 0.1500 r.sub.18 = 30.8549 d.sub.18 = 3.0000 n.sub.10 = 1.69680 ν.sub.10 = 55.52 r.sub.19 = 90.7813 d.sub.19 = 1.3000 r.sub.20 = -24.0593 d.sub.20 = 1.0000 n.sub.11 = 1.84666 ν.sub.11 = 23.88 r.sub.21 = -184.3586 d.sub.21 = 5.8297 r.sub.22 = 136.6332 d.sub.22 = 1.0000 n.sub.12 = 1.80518 ν.sub.12 = 25.43 r.sub.23 = 27.4732 d.sub.23 = 1.9396 r.sub.24 = 178.2794 d.sub.24 = 4.7972 n.sub.13 = 1.56873 ν.sub.13 = 63.16 r.sub.25 = -19.8353 d.sub.25 = 0.1342 r.sub.26 = 27.9084 d.sub.26 = 4.6096 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = -64.6149 l/f.sub.IV = 1.860, D/f.sub.IV = 0.255, f.sub.W /f.sub.A = 0.110 f.sub.I /f.sub.W = 2.685, f.sub.II /f.sub.W = -0.840, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν.sub.6 = 29.35, n.sub.IVn = 1.82592 ν.sub.IVap - ν.sub.IVbp = -11.415, f.sub.B = 0.95f.sub.S ______________________________________ wherein the reference symbols r 1 through r 27 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 26 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 14 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 14 represents Abbe's numbers of the respective lens elements.

Claim 23

A large aperture zoom lens system comprising a varifocal subsystem comprising a first lens unit having a positive focal length and being immovable for varying focal length of said zoom lens system as a whole, a second variator lens unit having a negative focal length and being movable for varying focal length of the zoom lens system as a whole, and a third compensator lens unit having a negative focal length and functioning mainly for compensating variation of the image position caused by the variation of the focal length of said zoom lens system as a whole, and a relay lens system arranged as a fourth lens unit, said first lens unit comprises a positive cemented doublet comprising a negative meniscus lens element and a biconvex lens element, and a positive meniscus lens component, said second lens unit comprising a negative meniscus lens component, and a negative cemented doublet comprising a biconcave lens element and a positive lens element, said third lens unit comprising a negative lens component, and said fourth lens unit consisting of a front sub-unit comprising a positive lens component, a positive lens component and a negative lens component, and a rear sub-unit comprising a negative lens component, a positive lens component and a positive lens component, said zoom lens system having the following numerical data: ______________________________________ f = 14˜24.25˜42 ______________________________________ r.sub.1 = 73.1407 d.sub.1 = 1.1600 n.sub.1 = 1.80518 ν.sub.1 = 25.43 r.sub.2 = 29.2813 d.sub.2 = 7.3000 n.sub.2 = 1.62280 ν.sub.2 = 57.06 r.sub.3 = -142.5699 d.sub.3 = 0.1700 r.sub.4 = 29.4855 d.sub.4 = 5.6000 n.sub.3 = 1.62012 ν.sub.3 = 49.66 r.sub.5 = 188.5203 d.sub.5 = 0.6000˜8.038˜13.370 r.sub.6 = -2148.9531 d.sub.6 = 1.0400 n.sub.4 = 1.73400 ν.sub.4 = 51.49 r.sub.7 = 12.7344 d.sub.7 = 3.9500 r.sub.8 = -19.2458 d.sub.8 = 1.0400 n.sub.5 = 1.69350 ν.sub.5 = 53.23 r.sub.9 = 14.4976 d.sub.9 = 3.1000 n.sub. 6 = 1.84666 ν.sub.6 = 23.88 r.sub.10 = -336.4032 d.sub.10 = 14.0324˜5.201˜2.643 r.sub.11 = -21.0833 d.sub.11 = 1.0000 n.sub.7 = 1.69680 ν.sub.7 = 55.52 r.sub.12 = -51.2968 d.sub.12 = 2.3119˜3.735˜0.854 r.sub.13 = 103.8053 d.sub.13 = 2.6678 n.sub.8 = 1.72916 ν.sub.8 = 54.68 r.sub.14 = -34.5149 d.sub.14 = 0.6169 r.sub.15 = ∞ (stop) d.sub.15 = 2.0000 r.sub.16 = 52.1018 d.sub.16 = 3.3386 n.sub.9 = 1.69680 ν.sub.9 = 55.52 r.sub.17 = -58.1766 d.sub.17 = 0.1500 r.sub.18 = 30.8549 d.sub.18 = 3.0000 n.sub.10 = 1.69680 ν.sub.10 = 55.52 r.sub.19 = 90.7813 d.sub.19 = 1.3000 r.sub.20 = -24.0593 d.sub.20 = 1.0000 n.sub.11 = 1.84666 ν.sub.11 = 23.88 r.sub.21 = -184.3586 d.sub.21 = 5.8297 r.sub.22 = 136.6332 d.sub.22 = 1.0000 n.sub.12 = 1.80518 ν.sub.12 = 25.43 r.sub.23 = 27.4732 d.sub.23 = 1.9396 r.sub.24 = 178.2794 d.sub.24 = 4.7972 n.sub.13 = 1.56873 ν.sub.13 = 63.16 r.sub.25 = -19.8353 d.sub.25 = 0.1342 r.sub.26 = 27.9084 d.sub.26 = 4.6096 n.sub.14 = 1.48749 ν.sub.14 = 70.15 r.sub.27 = -64.6149 l/f.sub.IV = 1.860, D/f.sub.IV = 0.255, f.sub.W /f.sub.A = 0.110 f.sub.I /f.sub.W = 2.685, f.sub.II /f.sub.W = -0.840, n.sub.4 = 1.73400 n.sub.6 - n.sub.5 = 0.15316, n.sub.5 = 1.69350 ν.sub.5 - ν.sub.6 = 29.35, n.sub.IVn = 1.82592 ν.sub.IVap - ν.sub.IVbp = -11.415, f.sub.B = 0.95f.sub.S ______________________________________ wherein the reference symbols r 1 through r 27 represent radii of curvature on the surfaces of the respective lens elements, the reference symbols d 1 through d 26 designate thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 14 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 14 represents Abbe's numbers of the respective lens elements.