Abstract: A rangefinder for detecting a distance of an object from the rangefinder by employing a triangular measuring system has a radiation emitter to emit infrared radiation towards the object; a position detector having a close-range detecting reglon and a remote-range detecting region, which are separate and independent of each other; a close-range converging lens for focusing the radiation reflected by the object on the close-range detecting region, when the distance of the object from the rangefinder is smaller than a predetermined distance; and a remote-range converging lens for focusing the radiation reflected by the object on the remote-range detecting region, when the distance of the object from the rangefinder is greater than a predetermined distance.

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.