Diaphragm adjustment mode selecting device for a photographic camera

Claim 1

In a camera for operation in daylight and artificial light, an automatic exposure control apparatus for controlling the effective exposure aperture in automatic response to the level of illuminance of a subject being photographed as sensed photoelectrically comprising: diaphragm means arranged to provide a range of effective exposure apertures; a diaphragm adjustment mode selector member movable between a plurality of positions, one position being indicative of automatic selection of effective exposure apertures for daylight photography, one position being indicative of a particular effective exposure aperture for special flash photography, aNd the remaining positions being indicative of different guide numbers for flash-auto photography; guide number factoring means arranged to engage said selector member upon movement of said selector member between said positions thereof to assume the corresponding positions; focus adjusting means including output means arranged to operatively engage said guide number factoring means at least when said selecting member is set to one of the flash-auto photography positions; and automatically adjustable setting means for said diaphragm means being arranged to permit the diaphragm means to operate throughout the entire dynamic range thereof when said selector member is set in the daylight photography position, to select an effective exposure aperture as a function of the positions of said guide number factoring means and said output means when said selector member is set in one of the flash-auto photography positions, and to select the particular effective exposure aperture when said selector member is set in the special flash photography position.