An apparatus, such as a camera, adapted for a film having a magnetic recording part includes a detecting device which detects perforations of the film, a magnetic head which performs at least one of reading and writing of information from or into the magnetic recording part of the film, and a microprocessor which performs processing of a signal detected by the detecting device and processing of a signal read or to be written by the magnetic head, wherein the microprocessor A/D-samples the signal detected by the detecting device.