Mechanical mounting system for zoom objective

摘要

A mechanical mounting system for a zoom objective having provision for close-up operation includes an actuator serving to perform both focusing and zooming operations as it is turned and axially moved respectively. When the actuator is axially moved to the wide angle position and when it is turned to the lower limit of the focusing range, a drive connection between the actuator and a camming cylinder for the zoom and close-up control is established even in the transverse direction. Upon transverse movement of the actuator beyond the focusing range, the camming cylinder is turned to axially move the variator forwardly while the compensator remains stationary in the wide angle position thereby effecting a close-up operation.