a camera which uses a film cartridge having a magnetic recording part for each frame portion thereof and writes magnetic information in the magnetic recording part of each frame , in rewinding the film after completion of photographing on all frames , is arranged to effectively prevent information from being recorded again at the time of rewinding the film for any frame having magnetic information already recorded in a case where the film cartridge loaded into the camera contains a film in which part of frames have been already exposed . in the camera , when a film cartridge having some of film frames already exposed is loaded , the camera stores the position of a leading unexposed frame and to permit recording of magnetic information up to the leading unexposed frame in performing the recording action at the time of film rewinding .