Photographic lens with rear stop diaphragm

Details Photographic lens with rear stop diaphragm Photographic lens with rear stop diaphragm

1980-02-05

1981-09-15

Clark, Conrad J.

350449, G02B 960

Patent

active

042893852

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.

REFERENCES:
patent: 2664783 (1954-01-01), Cook

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