Retrofocus type lens system

Details Retrofocus type lens system Retrofocus type lens system

1975-01-27

1976-05-25

Sacher, Paul A.

G02B 1134

Patent

active

039588653

ABSTRACT:
A retrofocus type lens system particularly useful for single lens reflex cameras. The back focal distance is 1.56 times as long as the effective focal length of the lens system and the angle of view is as large as 84.degree.. The aperture ratio is as large as F/2.8 and all aberrations are well corrected. The lens system comprises a positive meniscus lens L1, two negative meniscus lenses L2 and L3 convex to the front, a positive meniscus lens or plano-convex lens L4 convex to the rear, a biconvex lens L5, a cemented negative lens component consisting of a biconcave lens L6 and a positive meniscus lens L7, a positive meniscus lens L8 convex to the rear, and a positive lens L9.

REFERENCES:
patent: 3512874 (1970-05-01), Woltche
patent: 3549241 (1970-12-01), Moni

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