Semi-wide angle photographic lens having short overall length

Details Semi-wide angle photographic lens having short overall length Semi-wide angle photographic lens having short overall length

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

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