Telephoto lens system

Claim 2

A telephoto lens system comprising, in the order as viewed from the object side, a first convergent lens group movable along the optical axis of the system, a divergent lens group movable along the optical axis of the system and a second convergent lens group stationary for focusing, said first convergent lens group and said divergent lens group forming substantially an afocal system for an object at infinite distance, and focusing upon a nearer object being attained by the movement of one of said first convergent lens group and said divergent lens group to lengthen the air space therebetween.

Claim 3

A telephoto lens system according to claim 1, wherein said first convergent lens group is stationary, whereby focusing upon an object is attained by the movement of said divergent lens group.

Claim 4

A telephoto lens system according to claim 1, wherein said first convergent lens group includes at least two components, the forward one being a biconvex positive component and the rearward one being a positive meniscus component convex toward the object side, and wherein said divergent lens group includes at least two negative components.

Claim 5

A telephoto lens system according to claim 3, wherein said first convergent lens group satisfies the following conditions: ##EQU3## where F, f 1 and N respectively represent the total focal length of said telephoto lens system, the focal length of the first convergent lens group and the F-number of said telephoto lens system r 1 and r 2 respectively represent radii of curvature of said biconvex positive component in the order from the object side, and r 3 and r t respectively represent radii of curvature of said positive meniscus component in the order from the object side.

Claim 6

A telephoto lens system according to claim 4, wherein said positive meniscus component of said first convergent lens group consists of a biconvex positive lens and a biconcave negative lens cemented to each other, and wherein the forward one of said negative components of said divergent group consists of a biconcave doublet component.

Claim 7

A telephoto lens system according to claim 5, wherein said second convergent lens group includes a positive meniscus component concave toward the object side.

Claim 8

A telephoto lens system according to claim 5, wherein said second convergent lens group includes a meniscus component convex toward the object side, a meniscus component concave toward the object side and a positive component.

Claim 9

A telephoto lens system according to claim 4, wherein said positive meniscus component of said first convergent lens group consists of a biconvex positive lens and a biconcave negative lens separated by air space from each other, and wherein the forward one of said negative components of said divergent lens group consists of a biconcave doublet component.

Claim 10

A telephoto lens system according to claim 8, wherein said second convergent lens group includes a positive meniscus component concave toward the object side.

Claim 11

A telephoto lens system according to claim 9, wherein said second convergent lens group further includes a meniscus component concave toward the object side.

Claim 12

A telephoto lens system according to claim 1, wherein __________________________________________________________________________ f = 100 F/5.6 __________________________________________________________________________ r.sub.1 = 36.366 d.sub.1 = 2.25 n.sub.1 = 1.50032 ν.sub.1 = 81.9 r.sub.2 = -90.941 d.sub.2 = 0.05 f1 = 39.6667 r.sub.3 = 31.549 d.sub.3 = 2.42 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = -56.162 d.sub.4 = 0.5 n.sub.3 = 1.7495 ν.sub.3 = 35.0 r.sub.5 = 127.820 d.sub.5 = 17.518 19.0177 r.sub.6 = -44.096 d.sub.6 = 1.0 n.sub.4 = 1.69895 ν .sub.4 = 30.0 r.sub.7 = -13.345 d.sub. 7 = 0.333 n.sub.5 = 1.6425 ν .sub.5 = 58.1 f2 = -17.6667 r.sub.8 = 37.760 d.sub.8 = 0.833 r.sub.9 = 357.048 d.sub.9 = 0.333 n.sub.6 = 1.6968 ν .sub.6 = 55.6 r.sub.10 = 24.316 d.sub.10 = 2.777 1.2768 r.sub.11 = -61.058 f3 = 44.5378 d.sub.11 = 0.833 n.sub.7 = 1.50032 ν .sub.7 = 81.9 r.sub.12 = -16.3995 __________________________________________________________________________ where, as viewed from the object side, r 1 , r 2 , r 3 - - - denote radii of curvature of the surface of the lenses; d 1 , d 2 , d 3 - - - denote lens thicknesses and air spaces between lenses; n 1 , n 2 , n 3 - - - denote refractive index of glasses; and ν 1 , ν 2 , ν 3 - - - denote Abbe numbers of the glasses.

Claim 13

A telephoto lens system according to claim 1, wherein __________________________________________________________________________ f = 100 F/5.6 __________________________________________________________________________ r.sub.1 = 30.557 d.sub.1 = 2.25 n.sub.1 = 1.50032 ν.sub.1 = 81.9 r.sub.2 = -67.507 d.sub.2 = 0.05 f1 = 37.5 r.sub.3 = 27.078 d.sub.3 = 2.417 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = -85.400 d.sub.4 = 0.417 r.sub.5 = -64.585 d.sub.5 = 0.667 n.sub.3 = 1.7495 ν.sub.3 = 35.0 r.sub.6 = 65.816 d.sub.6 = 16.614 17.947 r.sub.7 = -31.899 d.sub.7 = 1.083 n.sub.4 = 1.69895 ν.sub.4 = 30.0 r.sub.8 = -10.884 d.sub.8 = 0.333 n.sub.5 = 1.60311 ν.sub.5 = 60.7 f2 = -15.0 r.sub.9 = 56.259 d.sub.9 = 0.667 r.sub.10 = -182.572 d.sub.10 = 0.5 n.sub.6 = 1.6968 ν.sub.6 = 55.6 r.sub.11 = 18.670 d.sub.11 = 2.888 1.555 r.sub.12 = -49.985 f3 = 40.222 d.sub.12 = 0.833 n.sub.7 = 1.50032 ν.sub.7 = 81.9 r.sub.13 = -14.370 __________________________________________________________________________ where, as viewed from the object side, r 1 , r 2 , r 3 - - - denote radii of curvature of the surface of the lenses; d 1 , d 2 , d 3 - - - denote lens thicknesses and air spaces between lenses; n 1 , n 2 , n 3 - - - denote refractive index of glasses; and ν 1 , ν 2 , ν 3 - - - denote Abbe numbers of the glasses.

Claim 14

A telephoto lens system according to claim 1, wherein __________________________________________________________________________ f = 100 F/8 __________________________________________________________________________ r.sub.1 = 44.142 d.sub.1 = 1.167 n.sub.1 = 1.5168 ν.sub.1 = 64.2 r.sub.2 = -61.667 d.sub.2 = 0.033 f1 = 40.667 r.sub.3 = 29.157 d.sub.3 = 1.367 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = -58.842 d.sub.4 = 1.167 n.sub.3 = 1.7495 ν.sub.3 = 35.0 r.sub.5 = 83.740 d.sub.5 = 22.208 24.541 r.sub.6 = 0.0 d.sub.6 = 0.8 n.sub.4 = 1.69895 ν.sub.4 = 30.0 r.sub.7 = -14.985 d.sub.7 = 0.250 n.sub.5 = 1.5168 ν.sub.5 = 64.2 f2 = -14.167 r.sub.8 = 15.833 d.sub.8 = 1.333 r.sub.9 = -18.333 d.sub.9 = 0.333 n.sub.6 = 1.61266 ν.sub.6 = 44.3 r.sub.10 = 39.917 d.sub.10 = 4.483 2.15 r.sub.11 = 14.333 d.sub.11 = 2.767 n.sub.7 = 1.50032 ν.sub.7 = 81.9 r.sub.12 = 79.515 d.sub.12 = 18.6 r.sub.13 = -6.995 f3 = 34.833 d.sub.13 = 0.8 n.sub.8 = 1.76684 ν.sub.8 = 46.6 r.sub.14 = -11.790 d.sub.14 = 0.067 r.sub.15 = 0.0 d.sub.15 = 1.7667 n.sub.9 = 1.51454 ν.sub.9 = 54.6 r.sub.16 = -11.798 Bf = 13.511 __________________________________________________________________________ where, as viewed from the object side, r 1 , r 2 , r 3 - - - denote radii of curvature of the surface of the lenses; d 1 , d 2 , d 3 - - - denote lens thicknesses and air spaces between lenses; n 1 , n 2 , n 3 - - - denote refractive index of glasses; and ν 1 , ν 2 , ν 3 - - - denote Abbe numbers of the glasses.

Claim 15

A telephoto lens system according to claim 1, wherein __________________________________________________________________________ f = 100 F/8 __________________________________________________________________________ r.sub.1 = 22.409 d.sub.1 = 1.813 n.sub.1 = 1.50032 ν.sub.1 = 81.9 r.sub.2 = -52.905 d.sub.2 = 0.038 r.sub.3 = 21.406 f1 = 28.125 d.sub.3 = 1.763 n.sub.2 = 1.50032 ν.sub.2 = 81.9 r.sub.4 = -59.375 d.sub.4 = 0.388 r.sub.5 = -45.0 d.sub.5 = 0.625 n.sub.3 = 1.7495 ν.sub.3 = 35.0 r.sub.6 = 55.968 d.sub.6 = 12.192 13.067 r.sub.7 = -21.434 d.sub.7 = 0.813 n.sub.4 = 1.69895 ν.sub.4 = 30.0 r.sub.8 = -8.861 f2 = -11.25 d.sub.8 = 0.288 n.sub.5 = 1.5168 ν.sub.5 = 64.2 r.sub.9 = 60.284 d.sub.9 = 0.5 r.sub.10 = -48.75 d.sub.10 = 0.375 n.sub.6 = 1.6968 ν.sub.6 = 55.6 r.sub.11 = 13.432 d.sub.11 = 1.472 0.597 r.sub.12 = -20.75 d.sub.12 = 0.5 n.sub.7 = 1.51454 ν.sub.7 = 54.6 r.sub.13 = -10.399 d.sub.13 = 28.067 f3 = 40.0 r.sub.14 = -19.068 d.sub.14 = 0.5 n.sub.8 = 1.5168 ν.sub.8 = 64.2 r.sub.15 = -28.75 d.sub.15 = 0.375 n.sub.9 = 1.51118 ν.sub.9 = 50.9 r.sub.16 = -18.584 __________________________________________________________________________ where, as viewed from the object side r 1 , r 2 , r 3 - - - denote radii of curvature of the surface of the lenses; d 1 , d 2 , d 3 - - - denote lens thicknesses and air spaces between lenses; n 1 , n 2 , n 3 - - - denote refractive index of glasses; and ν 1 , ν 2 , ν 3 - - - denote Abbe numbers of the glasses.