Photographic camera

Claim 1

A PHOTOGRAPHIC CAMERA HAVING AN OPTICAL AXIS AND COMPRISING A FOCUSING TUBE MOUNTED FOR ADJUSTMENT BY ROTATION ABOUT THE OPTICAL AXIS, A FOCUSING SCALE GRADUATED CIRCUMFERENTIALLY ABOUT THE PERIPHERY OF SAID FOCUSING TUBE, A DEPTH OF FIELD INDICATING DEVICE COMPRISING A PAIR OF POINTER RINGS MOUNTED FOR ROTATION ABOUT THE OPTICAL AXIS AND EACH HAVING A POINTER FOR INDICATING A VALUE ON SAID FOCUSING SCALE, A DIAPHRAGM APERTURE SETTING RING MOUNTED FOR MANUAL ADJUSTMENT BY ROTATION ABOUT THE OPTICAL AXIS, A FOCUS ADJUSTING RING ALSO MOUNTED FOR ROTATION ABOUT SAID OPTICAL AXIS, AND MEANS INCLUDING DIFFERENTIAL GEARING OPERATIVELY CONNECTING SAID FOCUSING TUBE, SAID DEPTH OF FIELD POINTER RINGS, SAID APERTURE SETTING RING, AND SAID FOCUS ADJUSTING RING TO EACH OTHER FOR TURNING SAID FOCUSING TUBE AND ONE OF SAID DEPTH OF FIELD POINTER RINGS SIMULTANEOUSLY IN THE SAME DIRECTION AND TO THE SAME EXTENT BY ROTARY MOVEMENT OF SAID APERTURE SETTING RING WHILE SAID FOCUS ADJUSTING RING REMAINS STATIONARY, AND FOR TURNING SAID FOCUSING TUBE WITHOUT MOVEMENT OF SAID DEPTH OF FIELD POINTER RINGS BY ROTARY MOVEMENT OF SAID FOCUS ADJUSTING RING WHILE SAID APERTURE SETTING RING REMAINS STATIONARY.