Film cassette with automatic film speed register - has scanner with control device activated by camera handling and providing mechanical load release

a rib (2) on the cassette indicates the film speed. When the cassette is inserted in the camera, this rib positions a lever (6, 7). Closing the camera back, or cocking the shutter, or transporting the film, causes a second lever (10) to lift the first (6) slightly away from the rib (2), so that the cassette lies free in the camera. A cassette containing a film of a different speed has no rib, so that the first lever rests further down (spring 8), and the second remains out of engagement with it (at 10). Then a stop (16) is no longer placed in the path of the rod (18) that brings the exposure-correcting element into operation.