Finder optical system for a single-lens reflex camera

Details Finder optical system for a single-lens reflex camera Finder optical system for a single-lens reflex camera

1987-04-15

1988-03-15

Gellner, Michael L.

G03B 1306, G03B 1912

Patent

active

047316250

ABSTRACT:
A finder optical system for a single-lens reflex camera comprising a pentagonal roof prism, and an eyepiece which comprises a negative lens and a positive lens and which is arranged on the light exiting side of the pentagonal roof prism, the finder optical system being arranged that an aspherical surface is adopted for the surface on the image side of the negative lens so as to thereby arrange that, even when a small-sized pentagonal roof prism is used, a satisfactorily long eye relief is ensured the magnification of the finder is not decreased and, at the same time, aberrations are corrected favorably.

REFERENCES:
patent: 4437750 (1984-03-01), Ikari

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