Real image mode variable magnification finder

Details Real image mode variable magnification finder Real image mode variable magnification finder

1998-02-20

1999-10-19

Blankenship, Howard B.

Photography

With viewfinder

Selective or adjustable viewfinder field

359432, 359676, G03B 1310

Patent

active

059702664

ABSTRACT:
A real image mode variable magnification finder includes an objective system having a positive refracting power, an image erecting optical system for erecting an image formed by the objective system, and an eyepiece system having a positive refracting power. The objective system is composed of a first lens unit of a negative biconcave lens, a second lens unit of a positive lens, and a third lens unit of a positive meniscus lens with a convex surface directed toward the image side. The first lens unit is fixed and the second and third lens units are moved along the optical axis, thereby changing the magnification of the finder. In this way, the real image mode variable magnification finder of wide-angle design can be provided which is compact in size, has a high variable magnification ratio, and exhibits excellent performance for correction for aberration.

REFERENCES:
patent: 5257129 (1993-10-01), Morooka et al.

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