Zooming finder

Details Zooming finder Zooming finder

1992-09-09

1995-03-21

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

354225, 359683, 359708, G03B 1310

Patent

active

054001013

ABSTRACT:
An improved zooming viewfinder includes, in order from the object side, a positive first lens group, a negative second lens group that has a zooming capability and which is capable of moving along the optical axis, a negative third lens group that has a half mirror surface on the pupil side, and a fourth lens group that is a positive eyepiece and which has a field-limiting frame on the side the closest to the object. The eyepiece includes, in order from the object side, a positive lens element 4a and a negative lens element 4b.

REFERENCES:
patent: 4834513 (1989-05-01), Nozawa
patent: 5052787 (1991-10-01), Sugawara

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