An arrangement for setting camera functions in dependence upon a characteristic of film being used in the camera. The arrangement includes a manually operable setting knob which can be turned to a plurality of settings and is arrested in each by an arresting device. This knob is used when the film cassette employed in the camera has no film-characteristic (e.g., film speed) mark. When the cassette does have such a mark, the insertion of the cassette into the film chamber of the camera causes disengagement of the arresting device and automatic turning of the knob to a position corresponding to the detected mark. Since the knob is visible to the user it serves as an indicator of the film in the camera, whether the camera setting is manually or automatically made.