Photographic lens with rear stop diaphragm
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorMasakazu Yamagata
Life of this patent
Estimating the term…
Abstract
A lens system including five lenses which are, in order from the object, a first single positive meniscus lens, a second single positive meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens. The overall lens system has an aperture ratio of 1:2.8 and a viewing angle of approximately 24.degree.. A stop diaphragm is disposed at a rear portion of the overall lens system. Operations are well compensated for by providing the various lenses with parameters as specified for the preferred embodiments.
Claims7
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.049 ______________________________________ r.sub.1 45.735 .sup.n d .sup..nu. d d.sub.1 10.853 1.60311 60.7 r.sub.2 210.900 d.sub.2 1.290 r.sub.3 33.385 d.sub.3 15.872 1.51633 64.1 r.sub.4 77.025 d.sub.4 3.155 r.sub.5 3392.655 d.sub.5 3.591 1.80518 25.4 r.sub.6 22.917 d.sub.6 9.900 r.sub.7 -33.391 d.sub.7 3.353 1.74077 27.8 r.sub.8 -29.895 d.sub.8 2.321 r.sub.9 43.549 d.sub.9 3.234 1.66446 35.8 r.sub.10 238.081 ______________________________________ .SIGMA.d = 53.569
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.050 ______________________________________ r.sub.1 45.779 n.sub.d .nu..sub.d d.sub.1 10.912 1.62299 58.1 r.sub.2 185.699 d.sub.2 1.210 r.sub.3 33.431 d.sub.3 15.832 1.51633 64.1 r.sub.4 78.549 d.sub.4 3.075 r.sub.5 2285.548 d.sub.5 3.591 1.80518 25.4 r.sub.6 22.818 d.sub.6 10.218 r.sub.7 -33.669 d.sub.7 3.353 1.71736 29.5 r.sub.8 -29.566 d.sub.8 2.301 r.sub.9 41.904 d.sub.9 3.254 1.66446 35.8 r.sub.10 179.908 .SIGMA.d = 53.746 ______________________________________
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.049 ______________________________________ r.sub.1 46.146 n.sub.d .nu..sub.d d.sub.1 10.654 1.64000 60.1 r.sub.2 205.061 d.sub.2 0.972 r.sub.3 33.520 d.sub.3 15.674 1.51633 64.1 r.sub.4 82.197 d.sub.4 2.976 r.sub.5 1307.390 d.sub.5 3.472 1.80518 25.4 r.sub.6 22.806 d.sub.6 8.888 r.sub.7 -33.292 d.sub.7 4.028 1.72825 28.5 r.sub.8 -30.512 d.sub.8 3.710 r.sub.9 45.535 d.sub.9 5.714 1.67270 32.1 r.sub.10 217.551 .SIGMA.d = 56.088 ______________________________________
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.039 ______________________________________ r.sub.1 46.843 n.sub.d .nu..sub.d d.sub.1 9.778 1.67000 57.3 r.sub.2 179.773 d.sub.2 0.198 r.sub.3 33.945 d.sub.3 15.233 1.55963 61.1 r.sub.4 82.026 d.sub.4 2.340 r.sub.5 333.433 d.sub.5 3.412 1.76182 26.6 r.sub.6 22.060 d.sub.6 10.790 r.sub.7 -33.407 d.sub.7 3.769 1.54072 47.2 r.sub.8 -30.184 d.sub.8 3.848 r.sub.9 50.320 d.sub.9 6.149 1.68893 31.1 r.sub.10 201.892 .SIGMA.d = 55.517 ______________________________________
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.038 ______________________________________ r.sub.1 46.861 n.sub.d .nu..sub.d d.sub.1 9.801 1.67000 57.3 r.sub.2 180.474 d.sub.2 0.198 r.sub.3 33.960 d.sub.3 15.237 1.55963 61.1 r.sub.4 81.416 d.sub.4 2.361 r.sub.5 330.254 d.sub.5 3.412 1.76182 26.6 r.sub.6 22.078 d.sub.6 10.674 r.sub.7 -33.305 d.sub.7 3.809 1.51633 64.1 r.sub.8 -30.017 d.sub.8 3.809 r.sub.9 50.675 d.sub.9 6.150 1.68893 31.1 r.sub.10 212.271 .SIGMA.d = 55.451 ______________________________________
A lens system comprising, in order from the object, a first single meniscus lens, a second single meniscus lens, a third single negative lens, a fourth single meniscus lens and a fifth single positive lens wherein:
- ______________________________________ f = 100 F.sub.NO. 1:2.8 2.omega. = 24.degree. K = 1.058 ______________________________________ r.sub.1 57.928 n.sub.d .nu..sub.d d.sub.1 9.700 1.62280 57.1 r.sub.2 781.092 d.sub.2 0.200 r.sub.3 31.276 d.sub.3 15.680 1.51633 64.1 r.sub.4 66.664 d.sub.4 2.980 r.sub.5 311.160 d.sub.5 3.340 1.78472 25.7 r.sub.6 22.864 d.sub.6 10.580 r.sub.7 -42.118 d.sub.7 2.780 1.56965 49.3 r.sub.8 -82.936 d.sub.8 1.420 r.sub.9 103.924 d.sub.9 3.900 1.72342 37.9 r.sub.10 -53.328 .SIGMA.d = 50.580 ______________________________________
Dependencies are inferred from the claim text.