Compact retrofocus type lens system

Details Compact retrofocus type lens system Compact retrofocus type lens system

1979-02-15

1981-04-28

Sacher, Paul A.

G02B 964

Patent

active

042641373

ABSTRACT:
A compact retrofocus type lens system having a first lens component of a positive meniscus lens with its convex surface facing the object side, second and third lens components of negative meniscus lenses with their convex surfaces both facing the object side, a fourth lens component of a positive meniscus lens with its convex surface facing the object side, a fifth lens component of a biconvex lens, a sixth lens component of a biconcave lens, a seventh lens component of a positive meniscus lens with its convex surface facing the image side and an eighth lens component of a positive meniscus lens with its convex surface facing the image side. This lens system is so arranged that the lateral chromatic aberration is made small by increasing the Abbe number of the first lens component and also that the Petzval sum which is deteriorated thereby is corrected by increasing the refractive index of the fourth lens component.

REFERENCES:
patent: 3832037 (1974-08-01), Nakagawa
patent: 3976365 (1976-08-01), Nakagawa
patent: 4008952 (1977-02-01), Nakagawa

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