a camera housing a strip of receiving sheet of self - developable film material ; a strip of negative photosensitive film material of the self - developing type having discrete exposable portions spaced apart thereon . a pressure applying assembly e merges the strips into the superimposable relationship to form corresponding separated image forming subassemblies in response to pulling the strips from the camera . the assembly effects release of processing fluid in rupturable containers on the sheet to initiate processing of the film . a device is operative in one mode for allowing pulling of the strips and thereby the formation of an image forming subassemblies through the pressure applying device , and in a second mode for automatically stopping formation and processing of a successive one of the image forming subassemblies . in one embodiment , the device is connected to the shutter unit and is operated when the shutter is actuated .