of the 35mm "specs" attachment with a lens & prism to fit over the view and focus windows. It was used when the camera to subject distance was from the near range minimum of about 18 inches (0.45 meters) to the maximum of 36 inches (0.9 meters). These auxiliary "specs" were removed when focusing in the regular range beyond 36 inches. The Summicron lens could not turn to the near range settings unless the auxiliary "specs" were fitted in place on the lens. The 50 mm framelines are always visible. The viewfinder image is slightly larger. There are two ways to select the 90mm or 135mm framelines: putting a 90mm lens on the camera will automatically select the corresponding framelines toggling a small lever on the left of the lens. This way, one can see the tele-framelines when using a 50mm lens. It helps visualise the field of view for another focal length. (Earlier versions did not have a lever to view the 90mm frameline without attaching the lens.) Viewfinder cameras do not show exactly the same image in the viewfinder and on the film, due to the distance of the viewfinder to the view axis of the lens. This parallax problem is compensated in the M3 by moving the framelines when the lens is focused. This full parallax compensation is limited to one metre; closer distances require special "Leica glasses" as described above. Film transport The Leica IIIf and its predecessors had used a knob to advance the film. For fear of tearing the film, early M3s had a double stroke advance lever, like the Neoca 2s would. Later models (from model no 919 251) had single-stroke levers, which quickened up operation of the camera. Another type of variation is in the film pressure plate used. Early models used a glass plate to keep the film flat, whereas later models used a metal plate. Loading of the film is done by removing the bottom plate, like on the Leica II and III series. A door flap on the rear of the camera can be raised, allowing for easier access to the film, thereby overcoming a problem associated with these earlier screw-lens-type Leicas. The film is inserted from the bottom of the camera after the user has pre-attached the leading end to the take-up spool. Special cassettes were also available. Shutter Previous screw mount Leicas used two separate shutter speed