Abstract: A flat compact camera employing a disk type film cartridge includes a body member having an open topped cavity and directly mounting an objective lens and a chamber member replaceably housing a film cartridge and hinged along its rear to the camera body for swinging between a photographically inoperative position retracted into the cavity and an operative condition extending from the cavity. A mirror located in the cavity is swingable between retracted and advanced positions respectively offset from and intercepting the objective lens optical axis in response to the chamber member retracted and advanced positions. The shutter and film advancing mechanisms are housed in the chamber member and the viewfinder in the body member and the chamber member is spring biased toward its extended position and the mirror toward its advanced position, the chamber being releasably locked in retracted position.