Photographic lens mounts including an automatic diaphragm

Claim 1

A PHOTOGRAPHIC LENS MOUNT INCLUDING A SPRING-CONTROLLED PRESELECTION DIAPHRAGM AND COMPRISING A LENS BARREL, A FOCUSING TUBE, A LEAF RING ON AND ROTATABLE ABOUT SAID FOCUSING TUBE, SAID FOCUSING TUBE AND SAID LEAF RING BEING JOINTLY DISPLACEABLE ALONG THE OPTICAL AXIS IN SAID LENS BARREL, A RADIAL ARM FAST WITH SAID LEAF RING, A ROTATABLE ADJUSTING BODY PARALLEL TO THE OPTICAL AXIS DISPOSED BETWEEN SAID BARREL AND SAID FOCUSING TUBE, SAID ADJUSTING BODY HAVING AN EDGE WHICH IS PARALLEL TO THE OPTICAL AXIS AND URGES AGAINST SAID RADIAL ARM, THE LENGTH OF SAID EDGE CORRESPONDING TO THAT OF THE GREATEST POSSIBLE DISPLACEMENT OF SAID FOCUSING TUBE, AND A SHUTTER RELEASE, SAID ADJUSTING BODY BEING PERMANENTLY PARALLEL TO THE OPTICAL AXIS AND SO TILTABLE BY SAID SHUTTER RELEASE THAT SAID DIAPHRAGM CAN BE SET AT ITS GREATEST APERTURE AGAINST THE ACTION OF A LOCKING SPRING AND CAN BE RELEASED BY SAID EDGE AND SAID RADIAL ARM INDEPENDENTLY OF THE ADJUSTMENT OF SAID FOCUSING TUBE.