Abstract: An exposure indicating device for single lens reflex cameras which are selectively settable to automatic aperture control or automatic shutter speed control modes includes an exchangeable lens which has first and second information transmitting members, and a diaphragm setting member settable to one of a number of manually set aperture positions. The first transmitting member transmits to a first information receiving member, first information of the step-difference from a minimum to a preset f-number of the lens independently of the set position of the diaphragm setting member. The second transmitting member transmits to a second information receiving member, second information of a maximum f-number only when the diaphragm setting member is set to select a maximum f-number.

Abstract: An exposure indicating device for single lens reflex cameras which are selectively settable to automatic aperture control or automatic shutter speed control modes includes an exchangeable lens which has first and second information transmitting members, and a diaphragm setting member settable to one of a number of manually set aperture positions and to an automatic aperture control position. The first transmitting member transmits to a first information receiving member, first information of the step-difference from a minimum to a preset f-number of the lens independently of the set position of the diaphragm setting member. The second transmitting member transmits to a second information receiving member, second information of a maximum f-number only when the diaphragm setting member is set to the automatic aperture control position.

Abstract: A pentagonal prism holder retains a pentagonal prism in a given position above a focusing glass plate in a single lens reflex camera. A printed base plate holder having a light-receptive element-holding portion, in which at least a single light-receptive element is mounted, supports a printed base plate, on which are disposed electric elements constituting at least part of an electronic shutter controlling circuit. The printed base plate holder is removably mounted on the pentagonal prism holder, such that the light-receptive elements abut respective small prisms which are fixedly mounted on the roof of the pentagonal prism, whereby the light-receptive elements may receive part of the light images from the pentagonal prism.