Albada finder

Details Albada finder Albada finder

1994-09-14

1995-09-26

Hayes, Monroe H.

G03B 1302

Patent

active

054538092

ABSTRACT:
An Albada finder for a photographic camera consists of an objective lens group having a negative refractive power as a whole and an ocular lens group having a positive refractive power as a whole. The objective lens group is provided with a concave semitransparent mirror surface which is concave toward the ocular lens group. The semitransparent mirror surface is aspherical and the lens faces in the ocular lens group are all spherical. The following formulae (1) and (2) are satisfied,

REFERENCES:
patent: 3517582 (1970-06-01), Pituley
patent: 4104663 (1978-08-01), Yamazaki et al.
patent: 5317451 (1994-05-01), Hasushita

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