Apparatus for reflection photometry of a single lens reflex came

Details Apparatus for reflection photometry of a single lens reflex came Apparatus for reflection photometry of a single lens reflex came

1982-06-07

1984-07-10

Perkey, William B.

354480, G03B 7083

Patent

active

044590075

ABSTRACT:
An apparatus for reflection photometry of a single lens reflex camera includes a first shutter blind, the surface of which exhibits a reflectivity which is nearly one-half the reflectivity of a film surface. During the time a photoelectric transducer element, used for photometry, receives light reflection from the surface of the first blind, an output from a photometric circuit is doubled so as to be substantially equal to the output produced when the transducer element receives light reflection from the film surface during the running of the first blind.

REFERENCES:
patent: 3687026 (1972-08-01), Kobayashi et al.
patent: 4064517 (1977-12-01), Maitani et al.
patent: 4295720 (1981-10-01), Mizokami et al.
patent: 4367022 (1983-01-01), Yamasaki

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