Finder optical system

Details Finder optical system Finder optical system

1991-07-16

1993-01-26

Hannaher, Constantine

Optical: systems and elements

Lens

With graded refractive index

259653, 259654, 259655, G01B 302

Patent

active

051826720

ABSTRACT:
A finder optical system provided separately from a photo-taking lens comprises, from the object side: an object lens from forming a primary image which is an inverted image of an object and for erecting the primary image to form an erecting image; and an eyepiece for enlarging said erecting image. The object lens comprises a gradient index lens.

REFERENCES:
patent: 4291945 (1981-09-01), Hayamizu
patent: 4723843 (1988-02-01), Zobel
patent: 4730905 (1988-03-01), Takada
patent: 4905082 (1990-02-01), Nishigaki et al.

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