Keplerian zoom finder optical system

Details Keplerian zoom finder optical system Keplerian zoom finder optical system

1989-10-16

1991-04-09

Sugarman, Scott J.

350427, 350432, 354219, 354222, 354225, G02B 1514, G02B 1318, G03B 1302

Patent

active

050059556

ABSTRACT:
A Keplerian zoom finder optical system having a zoom power variable objective lens, the Keplerian zoom finder optical system comprising: a zoom objective lens including a first lens group having a negative refracting power and a second lens group including at least a positive meniscus lens whose convex surface faces an image and having a positive refracting power, the lens group being moved for the purpose of conducting the zoom power variation; and an ocular used for enlarging and observing the image formed by the zoom objective lens, wherein when a focal length of the first lens group is f.sub.1, a focal length of the second lens group is f.sub.2, and a curvature radius of the convex surface of the positive meniscus lens is r.sub.a, the following conditions are met: ##EQU1##

REFERENCES:
patent: 4842395 (1989-06-01), Sato et al.

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