Telephoto zoom lens

Claim 2

A telephoto zoom lens comprising a variable magnification system including a first group which does not move during a zooming operation, but moves only during a focussing operation and generally having a positive refractive power and serving as a focussing group, a second group generally having a negative refractive power to serve as a variator lens group and disposed for movement along an optical axis during a zooming operation, the second group principally utilized to convert a focal length, and a third group generally having a positive refractive power to serve as a compensator lens group, the third group being disposed for movement along the optical axis during a zooming operation to maintain an image plane at a given location as the latter tends to shift with the movement of the second group, the first to the third groups being sequentially disposed in the sequence named as viewed from an object side, and a relay lens system formed by a fourth group which is disposed on an image side of the variable magnification system and which remains stationary during a focussing and a zooming operation; the first group including a composite converging lens system, formed by a combination of a negative and a positive or a positive and a negative single lens, and a positive single lens, all disposed in the sequence named as viewed from the object side, the second group including a negative lens, formed by a positive and a negative lens joined together, and a negative single lens, all disposed in the sequence named as viewed from the object side, the third group including a positive lens formed by a negative and a positive lens joined together, and the fourth group including a pair of positive lenses having their surfaces of high curvature directed toward the object side, a negative lens having its surface of a high curvature directed toward the image side, a positive single lens, and a negative lens having its surface of high curvature directed toward the object side, all disposed in the sequence named as viewed from the object side toward the image side, and wherein the individual lenses satisfy the following requirements: ##EQU2## where f i represents the composite focal length of an i-th group, r i the radius of curvature of an i-th surface, d i the axial thickness or air separation between an i-th and an (i+1)-th surface, n i the refractive index of an i-th lens with respect to d-line of the spectrum and ν i the Abbe's number of an i-th lens.

Claim 3

A telephoto zoom lens according to claim 1 in which representing the composite focal length of the telephoto zoom lens by f, the various parameters are defined as follows: ______________________________________ 71.4 ≦ f ≦ 147 F/4.0 f.sub.1 = 100 f.sub.3 = 85 f.sub.4 = 94.274 ______________________________________ r.sub.1 = 141.195 d.sub.1 = 2.00 n.sub.1 = 1.67270 ν.sub.1 = 32.17 r.sub.2 = 45.578 d.sub.2 = 6.50 n.sub.2 = 1.61272 ν.sub.2 = 58.58 r.sub.3 = 287.848 d.sub.3 = 0.10 r.sub.4 = 71.713 d.sub.4 = 4.00 n.sub.3 = 1.58913 ν.sub.3 = 61.25 r.sub.5 = -974.528 d.sub.5 = variable r.sub.6 = -776.784 d.sub.6 = 3.80 n.sub.4 = 1.78472 ν.sub.4 = 25.70 r.sub.7 = -39.912 d.sub.7 = 1.50 n.sub.5 = 1.69680 ν.sub.5 = 55.46 r.sub.8 = 59.749 d.sub.8 = 2.88 r.sub.9 = -50.859 d.sub.9 = 1.50 n.sub.6 = 1.69680 ν.sub.6 = 55.46 r.sub.10 = 165.681 d.sub.10 = variable r.sub.11 = 52.618 d.sub.11 = 1.50 n.sub.7 = 1.67270 ν.sub.7 = 32.17 r.sub.12 = 25.730 d.sub.12 = 5.20 n.sub.8 = 1.51823 ν.sub.8 = 58.96 r.sub.13 = -101.761 d.sub.13 = variable r.sub.14 = 42.825 d.sub.14 = 3.80 n.sub.9 = 1.51633 ν.sub.9 = 64.15 r.sub.15 = 256.174 d.sub.15 = 0.10 r.sub.16 = 26.650 d.sub.16 = 4.30 n.sub.10 = 1.51633 ν.sub.10 = 64.15 r.sub.17 = 47.901 d.sub.17 = 7.48 r.sub.18 = 267.210 d.sub.18 = 3.56 n.sub.11 = 1.75520 ν.sub.11 = 27.56 r.sub.19 = 24.809 d.sub.19 = 8.10 r.sub.20 = 41.372 d.sub.20 = 4.84 n.sub.12 = 1.60717 ν.sub.12 = 40.36 r.sub.21 = -32.367 d.sub.21 = 4.61 r.sub.22 = -24.809 d.sub.22 = 1.50 n.sub.13 = 1.63854 ν.sub.13 = 55.46 r.sub.23 = -162.783 ______________________________________ and variable separations are defined as follows: ______________________________________ f 71.400 102.449 147.000 ______________________________________ d.sub.5 2.836 19.050 30.350 d.sub.10 25.140 15.498 1.664 d.sub.13 8.785 2.213 4.747 ______________________________________

Claim 4

A telephoto zoom lens according to claim 1 in which representing the composite focal length of the telephoto zoom lens by f, the various parameters are defined as follows: ______________________________________ 71.4 ≦ f ≦ 147 F/4.0 f.sub.1 = 100, f.sub.3 = 85, f.sub.4 = 94.274 ______________________________________ r.sub.1 = 135.746 d.sub.1 = 6.30 n.sub.1 = 1.61272 ν.sub.1 = 58.58 r.sub.2 = -76.800 d.sub.2 = 2.20 n.sub.2 = 1.67270 ν.sub.2 = 32.17 r.sub.3 = 500.000 d.sub.3 = 0.10 r.sub.4 = 87.155 d.sub.4 = 4.00 n.sub.3 = 1.58913 ν.sub.3 = 61.25 r.sub.5 = -583.829 d.sub.5 = variable r.sub.6 = -776.784 d.sub.6 = 3.80 n.sub.4 = 1.78472 ν.sub.4 = 25.70 r.sub.7 = -39.912 d.sub.7 = 1.50 n.sub.5 = 1.69680 ν.sub.5 = 55.46 r.sub.8 = 59.749 d.sub.8 = 2.88 r.sub.9 = -50.859 d.sub.9 = 1.50 n.sub.6 = 1.69680 ν.sub.6 = 55.46 r.sub.10 = 165.681 d.sub.10 = variable r.sub.11 = 52.618 d.sub.11 = 1.50 n.sub.7 = 1.67270 ν.sub.7 = 32.17 r.sub.12 = 25.730 d.sub.12 = 5.20 n.sub.8 = 1.51823 ν.sub.8 = 58.96 r.sub.13 = -101.761 d.sub.13 = variable r.sub.14 = 48.107 d.sub.14 = 3.80 n.sub.9 = 1.51633 ν.sub.9 = 64.15 r.sub.15 = -509.683 d.sub.15 = 0.10 r.sub.16 = 29.336 d.sub.16 = 4.30 n.sub.10 = 1.51633 ν.sub.10 = 64.15 r.sub.17 = 46.202 d.sub.17 = 10.39 r.sub. 18 = -267.210 d.sub.18 = 3.56 n.sub.11 = 1.75520 ν.sub.11 = 27.53 r.sub.19 = 27.163 d.sub.19 = 7.74 r.sub.20 = 42.629 d.sub.20 = 4.84 n.sub.12 = 1.60717 ν.sub.12 = 40.36 r.sub.21 = -29.086 d.sub.21 = 4.65 r.sub.22 = -23.705 d.sub.22 = 1.50 n.sub.13 = 1.63854 ν.sub.13 = 55.46 r.sub.23 = -93.340 ______________________________________ and variable separations are defined as follows: ______________________________________ f 71.40 102.449 147.0 ______________________________________ d.sub.5 2.629 18.843 30.143 d.sub.10 25.140 15.498 1.664 d.sub.13 8.796 2.224 4.758 ______________________________________

Claim 5

A telephoto zoom lens according to claim 1 in which representing the composite focal length of the telephoto zoom lens by f, the various parameters are defined as follows: ______________________________________ 71.4 ≦ f ≦ 147 F/4.0 f.sub.1 = 100, f.sub.3 = 85, f.sub.4 = 94.274 ______________________________________ r.sub.1 = 139.073 d.sub.1 = 6.30 n.sub.1 = 1.61272 ν.sub.1 = 58.58 r.sub.2 = -76.188 d.sub.2 = 2.20 n.sub.2 = 1.67270 ν.sub.2 = 32.17 r.sub.3 = 521.120 d.sub.3 = 0.10 r.sub.4 = 85.191 d.sub.4 = 4.00 n.sub.3 = 1.58913 ν.sub.3 = 61.25 r.sub.5 = -647.477 d.sub.5 = variable r.sub.6 = -1347.387 d.sub.6 = 3.80 n.sub.4 = 1.78472 ν.sub.4 = 25.7 r.sub.7 = -41.465 d.sub.7 = 1.50 n.sub.5 = 1.69680 ν.sub.5 = 55.46 r.sub.8 = 57.285 d.sub.8 = 2.88 r.sub.9 = -50.391 d.sub.9 = 1.50 n.sub.6 = 1.69680 ν.sub.6 = 55.46 r.sub.10 = 176.105 d.sub.10 = variable r.sub.11 = 51.821 d.sub.11 = 1.50 n.sub.7 = 1.67270 ν.sub.7 = 32.17 r.sub.12 = 24.940 d.sub.12 = 5.20 n.sub.8 = 1.51823 ν.sub.8 = 58.96 r.sub.13 = -101.940 d.sub.13 = variable r.sub.14 = 48.054 d.sub.14 = 3.80 n.sub.9 = 1.51633 ν.sub.9 = 64.15 r.sub.15 = 156.159 d.sub.15 = 0.10 r.sub.16 = 19.664 d.sub.16 = 4.30 n.sub.10 = 1.51633 ν.sub.10 = 64.15 r.sub.17 = 31.396 d.sub.17 = 6.47 r.sub.18 = 154.692 d.sub.18 = 3.56 n.sub.11 = 1.75520 ν.sub.11 = 27.53 r.sub.19 = 21.920 d.sub.19 = 4.88 r.sub.20 = 31.084 d.sub.20 = 4.84 n.sub.12 = 1.60717 ν.sub.12 = 40.36 r.sub.21 = -27.453 d.sub.21 = 3.08 r.sub.22 = -19.659 d.sub.22 = 1.50 n.sub.13 = 1.63854 ν.sub.13 = 55.46 r.sub.23 = -121.730 ______________________________________ and variable separations are defined as follows: ______________________________________ f 71.4 102.449 147.0 ______________________________________ d.sub.5 2.635 18.849 30.149 d.sub.10 25.177 15.535 1.701 d.sub.13 8.785 2.213 4.747 ______________________________________