Abstract: In a camera system according to the invention, a camera body and an interchangeable lens have respective identification data tables that are congruous with each other. As an appropriate data address is indicated to the interchangeable lens by the camera body, an identification data that is stored in the identification data storage section and corresponds to the indicated address is transmitted from the interchangeable lens to the camera body. The identification data judging section of the camera body compares the identification data transmitted back from the interchangeable lens and the identification data that is stored in the identification data storage section and corresponds to the address. As a result, it is determined if the dedicated accessory device is mounted on the camera body or not.

Abstract: This invention concerns the sharpening of camera-recorded pictures by flattening conventional photographic film as well as photographic film fitted in the manner of the invention with detachable, electrically and/or magnetically force-field responsive laminas against a camera reference-surface means which per se is the source of the field(s) acting on the film and/or is combined with separate force-field generating units generating such field(s). An optional, detachable dielectric bonding layer between such a lamina and the conventional film support allows removing the lamina after film exposure.