Large aperture ratio, long focus lens

Details Large aperture ratio, long focus lens Large aperture ratio, long focus lens

1981-08-10

1983-08-02

Corbin, John K.

350450, G02B 900, G02B 960

Patent

active

043962564

ABSTRACT:
A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface facing the object side, a third group comprising a negative meniscus lens consisting of a biconvex lens and a biconcave lens cemented thereto and having its convex surface facing the object side, a diaphragm, a fourth group comprising a meniscus lens consisting of a negative lens and a positive lens cemented thereto and having its convex surface facing the image side, and a fifth group comprising a positive lens.

REFERENCES:
patent: 2012822 (1935-08-01), Lee
patent: 2836102 (1958-05-01), Ito
patent: 2985071 (1961-05-01), Becker
patent: 3357776 (1967-12-01), Becker
patent: 3948584 (1976-03-01), Basista et al.

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