Multi-area brightness measuring apparatus

Details Multi-area brightness measuring apparatus Multi-area brightness measuring apparatus

1989-07-07

1991-06-04

Adams, Russell E.

354414, G03B 708

Patent

active

050218182

ABSTRACT:
A multi-area brightness measuring apparatus for a camera, which measures the brightness of an object in a center area of a photographing area and a circumferential area surrounding the center area to detect whether the object in the center area is in follow light state or in back light state in order to correct the exposure value. The exposure also can be controlled in accordance with the magnification, i.e. in accordance with the surface area of a main object occupying the center area.

REFERENCES:
patent: 3394078 (1982-07-01), Terashita
patent: 4322142 (1982-03-01), Kawamura et al.
patent: 4364650 (1982-12-01), Terashita et al.
patent: 4391500 (1983-07-01), Tsunekawa
patent: 4395099 (1983-07-01), Terasita
patent: 4809031 (1989-02-01), Sakaguchi et al.
Kyocera 230-AF.
Nikon AF401.
Canon EOS 650/620.
Nikon FA.

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