Finder system

Details Finder system Finder system

1984-04-23

1986-06-17

Hix, L. T.

354224, G03B 1310

Patent

active

045952701

ABSTRACT:
The disclosed finder system includes, from front to rear, a first objective lens of negative power, an optical member having a half-mirror, an eyepiece of positive power and a viewfinder frame arranged near the eyepiece to be observed by the eyepiece with the aid of a reflection from the half-mirror. The finder system satisfies the condition 0.2<d/D<0.6 where D is the air separation between the first objective lens and the eyepiece lens and d is the air separation between the optical member and the eyepiece lens. Thus the first objective lens is exchangeable for a second objective lens of different power from that of the first objective lens to change the magnification of the finder system.

REFERENCES:
patent: 3575082 (1971-04-01), McClune
patent: 4038673 (1977-07-01), Schroder
patent: 4104663 (1978-08-01), Yamazaki et al.
patent: 4251158 (1981-02-01), Kimura
patent: 4256396 (1981-03-01), Kawaguchi et al.

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