STILL CAMERA SYSTEM

PURPOSE:To use the title system without spoiling a spot AE lock function of a camera body by sending the information to a control circuit of a body side by operating a spot photometric use switch of a back side, when a replaceable back is installed in a back side of a camera body. CONSTITUTION:In a still camera system in which a replaceable back 2 such as a film back, a still video back, etc., can be installed freely in a back part of a camera body 1, in case of a state that the back 2 is installed in the camera body 1, a spot photometric use switch S8 of the body 1 side is covered and cannot be operated. On the back side, another spot photometric use switch S6 is provided in advance, therefore, when this switch S6 is operated, its information is transmitted to a camera side control microcomputer 41 through a control microcomputer 50. In such a way, the camera side body 1 executes a spot AE lock operation in the same way as its own spot photometric use switch S8 is operated.