As film cameras age, they can develop burs on parts inside the film advance chamber. The camera was given a plastic tipped film advance lever. They also had automatic film loading and motorized film advance. This made the SP the first rangefinder to have motorized film advance. Shutter release and film advance are as described under shutter below. The Diana frequently suffers from light leaks, film advance issues, and other problems. With a double-stroke film advance lever (later models have a single-stroke lever). Film advance was via a Minox-style push-pull housing. The "b" models were like the "a" models, but with a rapid film advance lever. While most of the camera's features were electronic, the film advance was still mechanical.