Finder optical system for cameras

Details Finder optical system for cameras Finder optical system for cameras

1989-02-13

1990-07-10

Adams, Russell E.

354155, G03B 7097

Patent

active

049410121

ABSTRACT:
A finder optical system for cameras comprises a Porro prism, a mirror assembly, or a compound assembly of a mirror and a prism which includes four reflecting surfaces for erecting an image formed through an imaging optical system and which can take out light for photometry from one of the reflecting surfaces. The finder optical system can bring about always constant photometric distribution without the increase of components in number, can make the correction of parallax to be required, and can be manufactured in small size and at low cost.

REFERENCES:
patent: 3465660 (1969-07-01), Trankner et al.
patent: 4171888 (1979-10-01), Shono et al.
patent: 4494853 (1985-01-01), Watanabe

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