Exposure control system for selectively determining exposure int

Details Exposure control system for selectively determining exposure int Exposure control system for selectively determining exposure int

1975-10-03

1977-07-12

Hix, L. T.

354 34, 354133, 354139, G03B 714, G03B 1503

Patent

active

040358135

ABSTRACT:
An exposure control system is provided for a photographic apparatus of the type which may be used in conjunction with a source of artificial illumination to illuminate darkened portions of a photographic subject under relatively high levels of ambient scene light intensity. The exposure control system includes means for programming the exposure control in a select manner so as to respond to the artificial light source being utilized under relatively high levels of ambient scene light intensity. The exposure is programmed by determining the exposure interval as a function of whether the artificial light source is ignited in an ordinary manner after a predetermined time delay subsequent to the commencement of the exposure cycle or in a so called "fill-in flash" manner as a function of the integrated ambient scene light intensity reaching a predetermined level. More specifically, operation of the camera in a fill-in flash mode provides for a specific adjustment to the exposure anticipation characteristic which adjustment may restore the anticipation characteristic to that used during normal ambient scene lighted conditions.

REFERENCES:
patent: 3610122 (1971-10-01), Biber
patent: 3659509 (1972-05-01), Burgarella
patent: 3667357 (1972-06-01), Matsuda
patent: 3687029 (1972-08-01), Leczkowski
patent: 3709113 (1973-01-01), Wood
patent: 3821754 (1974-06-01), Nobusawa
patent: 3886568 (1975-05-01), Yazaki et al.

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