Focal length extender

Details Focal length extender Focal length extender

1980-07-28

1982-12-07

Corbin, John K.

G02B 1308

Patent

active

043623662

ABSTRACT:
An improved focal length extender of the anamorphic type is disclosed for use in combination with a conventional primary lens. The lens system of the present invention comprises two portions. A first portion is positioned in front of the conventional lens, and a second portion of the lens system of the present invention is placed between the conventional lens and the film plane. The first and second portions cooperate together and with the conventional lens system to provide increased focal length while at the same time providing relatively reduced mass and bulk at increased optical speed.

REFERENCES:
patent: 2752821 (1956-07-01), Cook
patent: 2890622 (1959-06-01), Wallin
patent: 2915942 (1959-12-01), Cook
patent: 2940372 (1960-06-01), Ehrenhaft et al.
patent: 3041935 (1962-07-01), Jacobsen
patent: 3428398 (1969-02-01), Gottschalk
patent: 3871748 (1975-03-01), Day
patent: 3990785 (1976-11-01), Hirose

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