1989-05-15
1991-09-24
Perkey, W. B.
354423, G03B 1505
Patent
active
050517694
ABSTRACT:
An aperture value determining apparatus in taking photographs with flash light in accordance with the present invention receives a full open aperture value of a taking lens employed, information in association with object distance, information in association with film speed, a guide number of a flash apparatus and information in association with shutter speed, measures brightness of an object to be photographed, determines an exposure controlling value based on the information of film speed and on the brightness, calculates a maximum aperture value enabling proper photographing operation with flash light based on the information of the object distance, the information of film speed and the guide number, and sets prescribed aperture value larger than the full open aperture value. The aperture value is determined based on the magnitude of the prescribed aperture value in association with the maximum aperture value, the information of the shutter speed and on the exposure value.
REFERENCES:
patent: 4550996 (1985-11-01), Taniguchi et al.
patent: 4806963 (1989-02-01), Kobayashi et al.
patent: 4843418 (1989-06-01), Taniguchi et al.
Hata Koji
Hayashi Kohtaro
Karasaki Toshihiko
Yamano Yasuteru
Minolta Camera Kabushiki Kaisha
Perkey W. B.
Spyrou Cassandra C.
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