Multi-point photometric apparatus

Details Multi-point photometric apparatus Multi-point photometric apparatus

1987-06-30

1988-05-17

Gellner, Michael L.

G03B 7091

Patent

active

047454270

ABSTRACT:
A multi-point photometric apparatus for use in a camera or the like operative to measure the luminance of several divided areas in an objective field. Among the luminance signals produced by the photometric circuit for the several areas, a signal from one area which is used for automatic focus adjustment is designated as a reference value, and the maximum and minimum values of luminance signals and the differences of these from the reference value are evaluated. The reference value and differences in the form of digital data and information on the film latitude are processed with a microprocessor to calculate the exposure value. The exposure value is modified to an extend that the reference remains within the film latitude.

REFERENCES:
patent: 4306787 (1981-12-01), Isehara et al.
patent: 4309091 (1982-01-01), Fukuhara et al.
patent: 4412730 (1983-11-01), Saegusa et al.
patent: 4456354 (1984-06-01), Mizokami et al.
patent: 4476383 (1984-10-01), Fukuhara et al.

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