Patent
1979-01-09
1980-09-23
Clark, Conrad J.
G02B 960, G02B 1304
Patent
active
042239826
ABSTRACT:
A semi-wide angle photographic lens having short overall length is disclosed comprising six lens elements grouped into five components. The fourth component is composed of negative and positive lenses cemented each other to have a positive resultant focal length. The lens system has an aperture ratio of 1:2.8 and a view angle of .+-.24.degree..
REFERENCES:
patent: 3410632 (1968-11-01), Woltche
Asahi Kogaku Kogyo Kabushiki Kaisha
Clark Conrad J.
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