Waist level finder optical system

Details Waist level finder optical system Waist level finder optical system

1992-02-12

1993-12-14

Hayes, Monroe H.

354166, 354201, 354199, G03B 1308

Patent

active

052707580

ABSTRACT:
A waist level finder optical system comprising, in order from the object side: an objective lens system for finder comprising a first lens unit having positive refractive power and a second lens unit having negative refractive power; a reflecting member for erecting an image of object formed by the objective lens system; and a field lens having positive refractive power. This finder optical system can have a total length as a whole which is shortened without changing a half angle of incidence, a height of a principal ray as measured on the field lens and a distance as measured from the field lens to an eye point.

REFERENCES:
patent: 2800052 (1957-07-01), Bechtold et al.
patent: 4842395 (1989-06-01), Sato et al.
patent: 4957356 (1990-09-01), Oizumi et al.
patent: 5034763 (1991-07-01), Inabata
patent: 5034764 (1991-07-01), Inabata
patent: 5130855 (1992-07-01), Mukai et al.
patent: 5136427 (1992-08-01), Sugawara

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