Variable magnification viewfinder

Details Variable magnification viewfinder Variable magnification viewfinder

1988-08-11

1990-03-06

Sugarman, Scott J.

350426, 350427, 350432, 350560, G02B 15177, G02B 1318

Patent

active

049060783

ABSTRACT:
A variable magnification viewfinder so designed as to correct aberrations favorably and minimize variations of aberrations caused by varying magnification level thereof. The variable magnification viewfinder comprises an objective lens system and an eyepiece lens system, the objective lens system comprises in the order from the object side, a first negative lens unit, a second positive lens unit and a third positive lens unit, and is adapted in such a manner that magnification of the viewfinder is varied by shifting the second and third lens units along the optical axis with the first lens unit kept fixed.

REFERENCES:
patent: 3438689 (1969-04-01), Wehr
patent: 4779969 (1988-10-01), Sato et al.

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