camera state detector has a film cartridge

The invention relates to cameras for film rewinding. It relates to an apparatus in which the rewind feature lets the bait out of the cartridge body 2. According to the invention, the cartridge 2 has a recording portion 2A which contains information indicating whether the film contained is completely blank or whether it was used. Information is read just after loading and is written just before unloading. Mechanisms prevent the use of the camera when the cartridge has been used. Application to automatic cameras.