Vivitar Corporation

Masatoshi Shimojima

Rinzo Watanabe

A mechanism for a zoom lens having relatively movable lens groups where the aperture defining means moves with one of the lens groups.

Zoom lens

A mechanism for a zoom lens of the type in which the aperture defining diaphragm mechanism moves axially of the lens and changes the position of the exit pupil, where the mechanism modifies the aperture with changing focal length to maintain constant relative aperture at full relative aperture and further predetermines the stop down of the diaphragm mechanism as a function of selected relative aperture and focal length.

Zoom lens with movable diaphragm

This disclosure relates to variable focal lens having zooming and compensating groups movable axially in a non-linear relation. A single operating member is rotatable to move the front focusing group without moving the other groups, and movable axially to shift the zooming and compensating groups without moving the focusing group. Axial movement is imparted to the mount for the zooming group, and relative movement of the compensating group is controlled by rotative movement of the zooming group.

Growing community of inventors

Tokyo, Japan

Masatoshi Shimojima