Lighting type bright frame finder

Details Lighting type bright frame finder Lighting type bright frame finder

1994-12-08

1997-05-13

Metjahic, Safet

Photography

With viewfinder

With reflector

396384, G03B 1304, G03B 1308

Patent

active

056301880

ABSTRACT:
A lighting type bright frame finder has as objective lens having a negative focal length; an eyepiece having a positive focal length; a frame; and a joining prism joined through a half mirror. An optical path from the frame to the eyepiece is formed by arranging the joining prism such that the half mirror is located between the objective lens and the eyepiece. The lighting type bright frame finder is constructed such that a visual field image is overlapped with a frame image formed by only the eyepiece so as to observe these images. The focal length f.sub.e of the eyepiece, a distance E from an eye pupil side lens face of the eyepiece to an eye pupil face, and a maximum emitting angle .theta. satisfy the following condition (1).

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patent: 4707098 (1987-11-01), Wakamiya
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patent: 4999658 (1991-03-01), Kamitani et al.
patent: 5034763 (1991-07-01), Inbata
patent: 5317451 (1994-05-01), Hasushita
Lens Design Fundamentals, pp. 2, 3, 36, 37, and 335-345, 1978, Rudolf Kingslake.

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