Clip-on photoelectric shutter gave auto exposure capabilities to Models 95A/95B, One Hundred, 150, The 700 and the 800. Intended for use outdoors with Type 47 3000 ASA film only, the #440A was easily attached to the camera and set the shutter to B (Bulb) taking over as an external shutter. The selenium photocell moved a paddle controlling the pneumatic damping of the shutter thereby adjusting shutter speeds from approx 1/10sec to 1/800sec. Faster f/37 aperture than the original grey #440 shutter (f/54)