PURPOSE: To enable film sensitivity to be set automatically by providing a protrusion in the position corresponding to film sensitivity of the cap of the film winding shaft side of a patrone and detecting this position with a contact plate.

CONSTITUTION: When a patrone 2 is mounted to a film winding shaft 5, a contact plate 9 is pressure contacted to the top surface of the patrone 2 by a spring 8 from above. A protrusion 4 is provided to the cap 3 on the film winding shaft 5 side in the position corresponding to film sensitivity. Also, source points 10 corresponding to film sensitivities are disposed on the circumference of the contact plate 9 as well and therefore the setting circuit of the contact point matching the position of the protrusion 4, e.g., ASA 50, becomes conducting and the signal thereof is sent to an ASA code 16. It is further sent to an arithmetic circuit 17, whereby the iris and shutter sensitivity conforming to the film sensitivity may be automatically set.