Carl-zeiss-stiftung

Christian Ludwig

Dieter Rossmann

Volker Donn

Eugen Bayerl

Karl Herzog

Kurt Wallner

Siegfried Grosser

A lens mount, especially but not exclusively for use with motion picture cameras, with special means for preventing transmission of noise through the lens mount from operation of moving parts within the camera to a microphone located in front of the camera. A focusing lens mount has two mounting parts which are movable axially relative to each other, and with a small clearance space between these two parts. An annular groove is provided, extending circumferentially around a cylindrical portion of one of these mounting parts. In this groove is a sound damping or impeding element, resiliently pressed against a companion cylindrical surface on the other of the mounting parts, to block passage of sound through the clearance space between the two cylindrical parts. The sound damping element is made of material having good dry-sliding characteristics.

Lens mount with noise reducing means

A focusing system for long focal length objectives, having an intermediate tube between the camera and the objective proper. For purposes of focusing, there is a displaceable part movable longitudinally through the intermediate tube, and movement of this part serves to move the lens elements axially for focusing. A receiver portion on the bottom of the intermediate tube receives interchangeably, in quickly attachable and detachable manner, either one of two different focusing mechanisms, the first having the shape of a gun stock with a trigger-like member serving to focus the lens quickly but not necessarily precisely when quick picture shooting of moving objects is desired, the second mechanism having means for accurate focusing and a tripod thread socket. Provision is made for turning the camera 90 degrees to change the format of the picture. Mechanism is provided for pre-setting the diaphragm aperture, and for operating the diaphragm of the lens at the front end of the intermediate tube from the camera located at the rear end of the tube, with provision for adjusting these mechanisms properly when the camera is turned to change the format, without turning the objective at the front of the tube. It is not necessary to detach either the camera or the lens when changing from one focusing mechanism to the other, or when turning the camera to change the format.

Focusing system for long focal length objectives

Growing community of inventors

Oberkochen, Germany

Christian Ludwig