Abstract: A single-lens reflex camera having a motor-driven focusing device comprises a switch arranged to be controlled by an external operating member which is provided for turning off a power supply; and motor control means arranged to drive, in association with the switch, the motor-driven focusing device to shift its position to a given position where a photo-taking lens is at its minimum length. The camera, therefore, can be carried in a compact state for improved portability. The camera case also can be compactly arranged.

Abstract: A light measuring device comprises light receiving means arranged to divide a photographing field at least into three areas including a middle area located in the middle of the field, a first outer area located on the outer side of the middle area and a second outer area located on the outer side of the first outer area and to obtain luminance information on each of the areas; luminance difference detecting means for obtaining information of a luminance difference between adjacent areas among the plurality of areas from a plurality of luminance information values obtained by the light receiving means; computing means including photometric value computing circuits equivalent to a plurality of computing formulas each of which including as a function at least one of the plurality of luminance information values obtained by the light receiving means; and selection means for selecting one of the photometric value computing circuits of the computing means which is equivalent to one of the computing formulas on the

Abstract: A motor operated camera is capable of using a single electric motor for different operations. A planet gear transmission change-over device is formed within a motor gear train by a sun gear, a planet gear and a plurality of transmission gear which are arranged to be selectively engaged with the planet gear. Blocking means for preventing the revolution of the planet gear at a point where at least one pair consisting of the planet gear and one of the transmission gears engage each other is arranged in combination with unblocking means arranged to undo a blocked state brought about by the blocking means.