Fish eye lens system
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United States of America Patent
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-
Mar 3, 1987
Issued Date -
N/A
app pub date -
Jun 24, 1985
filing date -
May 20, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A high performance medium speed fish eye lens system is provided, capable of compensating all aberrations except the distortion at an aperture ratio of at least 1:4.2. The lens system consists of a first lens group (G1) of negative refractive power including two negative lenses curved towards the object, a middle positive lens component (G2) curved towards the object, which lens component can be composed of a cemented doublet, and a last lens group (G3) of positive refractive power consisting of a cemented doublet or a cemented doublet and an additional positive single lens both curved towards the image.
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