Abstract: A zoom lens barrel of the type in which an open F-value which is not maintained constant during a zooming operation by the original optical design, is caused to maintain an open F-value constant during a zooming operation, by the application of a diaphragm correction which is effected through a mechanical change in the diaphragm aperture. The diaphragm correction which is applied to maintain the open F-value constant is terminated when a diaphragm ring is set to an open F-value on the wide angle side or to a programmed mode position.

Abstract: A single lens reflex camera is provided which has a planar area for mounting a light emitting component such as an electronic flash thereon. The planar area is defined by at least a portion of top surface of a body of the camera which is located on one side of a pentaprism housing disposed centrally on the top surface, and is at a lower level than the remainder of the top surface which is located on the opposite side of the pentaprism housing. The planar area is formed with a threaded bore for mounting the light emitting component, and is also provided with a terminal connector having a plurality of terminals inclusive of a synchro contact terminal, an illumination control signal terminal and a power supply terminal.

Abstract: A motor driven camera includes a reversible motor which is disposed within the body of a camera. The camera includes a transmission mechanism which transmits a drive from the motor to a film winding mechanism, a film rewind mechanism, a shutter charging assembly, an automatic focussing assembly or a zone focus assembly in a selective manner. The motor is disposed in a space in the camera body located below the film wind and rewind shafts. The drive shaft of the motor extends perpendicular to the optical axis of the camera lines.

Abstract: A single-lens reflex camera comprises a gear rotated when a shutter button is depressed, a movable mirror rotated upward to the prescribed position, a stop-driving mechanism, and a control mechanism which transmits the rotation moment of the gear to the movable mirror and stop-driving mechanism to lift the movable mirror so that after the movable mirror is lifted, it actuates the stop-driving mechanism in the stop-down mode.

Abstract: A data recordable camera is provided with a timer circuit for providing a time data and a timing data, a data recording unit for converting the time data from the timer circuit into an optical image to expose a film, and data display unit for displaying the time data. The timing data is transferred to a motor drive device to determine the operation timing of the motor drive device.

Abstract: A single lens reflex camera is provided which has a planar area for mounting a light emitting component such as an electronic flash thereon. The planar area is defined by at least a portion of top surface of a body of the camera which is located on one side of a pentaprism housing disposed centrally on the top surface, and is at a lower level than the remainder of the top surface which is located on the opposite side of the pentaprism housing. The planar area is formed with a threaded bore for mounting the light emitting component, and is also provided with a terminal connector having a plurality of terminals inclusive of a synchro contact terminal, an illumination control signal terminal and a power supply terminal.