Real image mode variable magnification finder

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

1998-12-22

2000-11-28

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359431, 359689, G02B 2300

Patent

active

061543144

ABSTRACT:
A real image mode variable magnification finder includes, in order from an object side, an objective optical system with positive power, having at least three lens units; an image erecting device; and an ocular optical system with positive power. This finder also satisfies the following condition:

REFERENCES:
patent: 5231534 (1993-07-01), Kato
patent: 5701199 (1997-12-01), Takatao
patent: 5757543 (1998-05-01), Ogata
patent: 5815312 (1998-09-01), Takato
patent: 5920427 (1999-07-01), Ogata

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