The camera passes film without a scratch on the base or the emulsion. The aperture is what we now call "Super 35" format as the entire filmimage area is used from right perforations to left perforations. It holds 400 feet of film in the two removable film boxes. Before this, many cameras had the film boxes attached to the outside but this had a tendency to cause light leaks through the doors of the magazines so the camera bodies were made larger and the mags were put inside the camera.