Method and apparatus for photometry from plural points of automa

Details Method and apparatus for photometry from plural points of automa Method and apparatus for photometry from plural points of automa

1983-03-14

1991-04-23

Perkey, W. B.

Electrical pulse counters, pulse dividers, or shift registers: c

Counting or dividing in incremental steps

Beam type tube

354442, 377 47, 377107, 364703, G03B 708, G03B 7091, H03K 2100, G06F 752

Patent

active

050103598

ABSTRACT:
A method and apparatus for effecting photometry from plural points of an automatic exposure camera includes the provision of photometric means which determines the brightness of a relatively limited region of an image field. Photometry is successively made of the brightness of an object being photographed at a number of desired points thereon, utilizing the photometric means, and corresponding photometric values are derived. An average of these values is taken, and transmitted to exposure control means, thus effecting an exposure control in accordance with the average.

REFERENCES:
patent: 4029421 (1977-06-01), Sakurada et al.
patent: 4047187 (1977-09-01), Mashimo et al.
patent: 4174894 (1979-11-01), Fukuhara et al.
patent: 4182573 (1980-01-01), Yamada et al.
patent: 4277155 (1981-07-01), Rentschler et al.
patent: 4304473 (1981-12-01), Shreve
Can II SLR Meters all be Right, by Beaumont Newhall, Modern Photography, Nov. 1969, pp. 106-107.

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