Fish eye lens system

Details Fish eye lens system Fish eye lens system

1981-01-13

1983-11-01

Corbin, John K.

350439, 350462, G02B 960, G02B 962

Patent

active

044127260

ABSTRACT:
An improved compact high-speed fish eye lens system with minimal saggital flare is provided. The lens system comprises a front lens group having a pair of negative meniscus lens elements convex to the object side, an intermediate lens group having a pair of positive lens elements and a negative lens element, a rear lens group having a pair of doublets, the object side one of which includes an intermediate cemented surface having a positive refractive power. The radius of curvature, R, of the intermediate cemented surface of the object side doublet fulfills the following conditions wherein f represents the focal length of the whole lens system:

REFERENCES:
patent: 3734600 (1973-05-01), Shimizu
patent: 4009943 (1977-03-01), Horimoto
patent: 4256373 (1981-03-01), Horimoto
patent: 4291951 (1981-09-01), Ikemori

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