Abstract: A main lens carriage holding a main lens assembly is moved along the optical path by a cam cylinder. A supplemental lens element is operatively coupled with the main lens assembly at the proper position to attain the desired optical reduction ratio. When the main lens assembly deviates from the proper position, a main lens support frame is shifted along the optical path in and relative to the main lens carriage by a correcting mechanism so as to correct the deviation. A further supplemental lens element is provided, but does not move with the main lens assembly. Both supplemental lens elements swing into and out of the optical path under cam action; and further cam action is provided to ensure that the two swinging lens elements do not collide with each other. The main lens support frame is rapidly moved along the optical path by the cam action of a rotating cylinder having a cam groove having part-circular portions that define the desired dwell positions and having open ends.

Abstract: A handy type TV camera or motion picture camera with a grip includes a focal length varying means, a diaphragm aperture varying means and a focus adjusting means. One of these means is electrically controlled by use of a servomotor controlled by a potentiometer. Another of these means is manually controlled by use of a manually operable ring mounted on the camera. The remaining of these means is either electrically or manually controlled. The potentiometer for controlling the servomotor is operated by use of a manually operable control member provided on the grip of the camera. The control member is located on the back of the grip at an upper portion so that it is easily operated with the thumb of the hand which is used to hold the grip. The control member is horizontally movable or rotatable and the grip is extended obliquely downward and forward to further facilitate the operation of the control member.