High eye point type viewfinder optical system

Details High eye point type viewfinder optical system High eye point type viewfinder optical system

1993-07-07

1995-08-29

Sugarman, Scott J.

Optical: systems and elements

Lens

Eyepiece

354222, 354225, G02B 2500, G03B 1310, G03B 1308

Patent

active

054465907

ABSTRACT:
A high eye point type viewfinder optical system comprising an eyepiece lens system for observing an image of an object formed on a reticle, and a pentagonal prism and a condenser lens which are disposed between the reticle and the eyepiece lens system in order from the eyepiece lens system; wherein the eyepiece lens system consists, in order from the side of an eye of a photographer, of a first negative lens component, a second positive lens component and a third lens component. This viewfinder optical system is configured so as to permit adjustment of diopter by moving the second and third lens components along an optical axis with the first lens component kept fixed or moving the second lens component along the optical axis with the first and third lens components kept fixed.

REFERENCES:
patent: 4389097 (1983-06-01), Ohishi

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