View finder with adjustable framing plates for cameras with interchangeable objectives

Claim 1

IN A VIEW FINDER OF A CAMERA ADAPTED TO HAVE A PLURALITY OF OBJECTIVES OF DIFFERENT FOCAL LENGTHS INTERCHANGEABLY CONNECTED THERETO, IN COMBINATION, A PAIR OF PLATES LOCATED NEXT TO EACH OTHER AND TURNABLY CONNECTED WITH EACH OTHER FOR TURNING MOVEMENT ONE WITH RESPECT TO THE OTHER ABOUT A GIVEN AXIS, SAID PLATES BEING FORMED WITH CUTOUTS SPACED FROM SAID AXIS AND WITH CIRCULAR APERTURES HAVING THE CENTERS AT SAID AXIS, AND THE CUTOUTS OF ONE OF SAID PLATES REGISTERING WITH THE CUTOUTS OF THE OTHER OF SAID PLATES AT THE CORNERS OF RECTANGULAR AREAS OF DIFFERENT SIZES WHEN SAID PLATES ARE RESPECTIVELY AT DIFFERENT ANGULAR POSITIONS WITH RESPECT TO EACH OTHER, EACH PLATE COMPLETELY MASKING THE CUTOUTS OF THE OTHER PLATE EXCEPT FOR THE REGISTERING OF THE CUTOUTS AT THE CORNERS OF SAID RECTANGULAR AREA WHILE SAID CIRCULAR APERTURES WILL REMAIN IN REGISTRATION FOR ANY ANGULAR POSITION OF SAID PLATES WITH RESPECT TO EACH OTHER, SO THAT THE REGISTERING CUTOUTS MAY BE PROJECTED INTO THE FIELD OF VISION OF A VIEW FINDER FOR INDICATING THE SIZE OF THE VIEWING FIELD OF A PARTICULAR OBJECTIVE.