Abstract: A camera enables photography with a plurality of image plane formats and comprises an aperture portion having an opening for permitting photographic light to pass therethrough, a light shielding member movable between at least two predetermined positions to change a shape of the opening in the aperture portion, an operation member for moving the light shielding member to change the shape of the opening in the aperture portion, a detecting device for detecting a position of the light shielding member, and a warning device for providing a warning in response to a detection of the detecting device that the light shielding member is not located in any of the predetermined positions.

Abstract: To simplify the replacement of an auxiliary lamp installed in a lamp case inside a camera lamp, such as a built-in strobe, a modular quick-release assembly is used. A lamp case holds the auxiliary lamp and is installed within a holder as a unit coupled to a camera body. On the front end of this holder, a removable protective panel positioned in front of the auxiliary lamp is removably attached by a screw or elastic fastener. The lamp case is secured within the lamp by being held between the front end of the holder and the protective panel. Thus, replacement or repair can be accomplished by simply removing the protective panel from the holder and pulling out the lamp case that holds the auxiliary lamp.

Abstract: A camera has automatic focusing modes which can be switched upon operation of the release button. When the release button is depressed by a first operation, a photographing operation is performed in the focusing priority mode, that is, it is performed after the photographing lens is moved to an in-focus position. When the release button is depressed by a second operation after the first operation, the photographing operation is performed in the photographing priority mode, that is, the photographing operation is immediately performed without waiting until the photographing lens is moved to the in-focus position.

Abstract: A buffer comprises a specially designed bearing for supporting the rotation axis of a rotatable mirror. The bearing structure is so designed that when the rotation of the mirror is stopped by a stopper, the bearing can shift the rotation axis in the direction in which force is applied to the rotation axis. This shift takes place at the moment of mirror stop. Immediately after the shift, the rotation axis is returned to its original position by a biasing force.