Real image mode variable magnification finder optical system

Details Real image mode variable magnification finder optical system Real image mode variable magnification finder optical system

1992-09-25

1994-06-14

Henry, Jon W.

Optical: systems and elements

Compound lens system

Telescope

359421, 359837, 359726, 355222, 355224, G02B 2314, G02B 1504, G02B 504, G03B 1310

Patent

active

053215486

ABSTRACT:
A real image mode variable magnification finder optical system comprising an objective lens system including a rotatable prism, an image erecting optical system for erecting an image formed by the objective lens system and an eyepiece lens system having a positive refractive power. The prism is rotated 180.degree. for changing the finder optical system between a wide angle condition and a telephoto condition. This variable magnification finder optical system permits minimizing a space required for operating an optical member for changing a magnification thereof and composing the objective lens system compactly of a small number of component parts.

REFERENCES:
patent: Re17995 (1931-03-01), Mitchell
patent: 976370 (1910-11-01), Humbrecht et al.
patent: 1097635 (1914-05-01), Takase
patent: 1668015 (1928-05-01), Harris
patent: 3645602 (1972-02-01), Clave et al.
patent: 4779969 (1988-10-01), Sato et al.
Takase Appln. No. 07/951,000.

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