Finder optical system for a single lens reflex camera

Details Finder optical system for a single lens reflex camera Finder optical system for a single lens reflex camera

1978-01-19

1979-10-23

Hix, L. T.

354225, 354 53, G03B 1912

Patent

active

041718887

ABSTRACT:
A Kepler telescope type optical finder system for an SLR camera comprises a simple and compact prism having a generally wedge shape as contrasted with finder optical systems using surface mirrors or pentaprisms. The prism may be shaped so that the angle formed by the incident optical axis thereto and the emitting optical axis therefrom is smaller than 90.degree. in order to further miniaturize the overall size of the camera. In this case, an additional wedge-shaped prism is inserted between the first focal plane of the optical system and the prism in order to reduce the chromatic aberration. The additional wedge-shaped prism may be provided with a surface formed into the surface of the condenser lens.

REFERENCES:
patent: 4021823 (1977-05-01), Miyata
patent: 4113354 (1978-09-01), Yamasita

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