Abstract: A magnification and focus adjustment control device, includes a first lens unit; a second lens unit; and a first and second guiding device for guiding a movement of the second lens unit. While an operation of a magnification change is conducted, a position of the second guiding device relating to the first guiding device is selected to be a lens guiding position where the second lens unit is guided by the first and second guiding devices so that the second lens unit moves along a predetermined locus relating to a movement of the first lens unit. While an operation of a focus adjustment is conducted, the position of the second guiding device relating to the first guiding device is selected to be a guide releasing position where a guidance of the predetermined locus of the second guiding device relating to the first guiding device is released.

Abstract: A lens system for controlling an exposure value through the lens system at variable focal lengths. The lens system includes a base; a front lens unit which is movably mounted on the base; a rear lens unit which is also movably mounted on the base; a lens mover for moving the front and the rear lens units; a guide shaft member for guiding the front and the rear lens units along the axial direction of the lens system; a operational shaft member which is disposed parallel to the axial direction of the lens system; a cam to rotate the operational shaft member; and a controller, to control the exposure vale, which is slidably connected to the operational shaft member along the shaft in accordance with the movement of the front and the rear lens units, and the controller is rotated in accordance with a rotation of the operational shaft member.