Single lens reflex camera with exposure meter

Claim 1

IN A SINGLE LENS REFLEX CAMERA INCLUDING A HOUSING, AN OBJECTIVE, A VIEWFINDER SCREEN, AND MEANS SELECTIVELY OPERABLE TO DIRECT LIGHT RAYS, ENTERING THROUGH THE OBJECTIVE, TO THE SCREEN; A PHOTOELECTRIC EXPOSURE METER INCLUDING A PHOTOELECTRIC CELL AND AN INDICATING INSTRUMENT HAVING AN INDICATING POINTER; AND A SLIDE MOUNTING SAID PHOTOELECTRIC CELL AND SAID INDICATING INSTRUMENT, AND MOUNTED IN SAID CAMERA FOR MOVEMENT RELATIVE TO SAID SCREEN IN A DIRECTION SUBSTANTIALLY PARALLEL TO THE VIEWING SURFACE THEREOF AND INTO AND OUT OF THE PATH OF LIGHT RAYS THROUGH SAID SCREEN, THE LIGHT SENSITIVE SURFACE OF SAID PHOTOELECTRIC CELL FACING THE VIEWING SURFACE OF SAID SCREEN FOR IMPINGEMENT OF SAID LIGHT RAYS ON SAID PHOTOELECTRIC CELL; SAID INDICATING INSTRUMENT BEING MOUNTED ON SAID SLIDE IN LONGITUDINALLY SPACED RELATION TO SAID PHOTOELECTRIC CELL, CONSIDERED WITH RESPECT TO THE DIRECTION OF MOVEMENT OF SAID SLIDE, AND WITH ITS INDICATOR PROJECTING INTO THE SPACE BETWEEN SAID INDICATING INSTRUMENT AND SAID SLIDE; SAID SLIDE HAVING A RANGE OF MOVEMENT SUCH THAT, WHEN IT IS OPERATED TO MOVE SAID PHOTOELECTRIC CELL INTO THE PATH OF LIGHT RAYS THROUGH SAID SCREEN, SAID INDICATOR WILL ALSO APPEAR IN THE FIELD OF VIEW OF SAID SCREEN.