<P> Another 35 mm camera system that used a rotary shutter, was the Robot Royal cameras, most of which were rangefinder 35 mm cameras . Some of these cameras were full - frame; some were half - frame, and at least one Robot camera produced an unusual square - sized image on the 35 mm frame . </P> <P> The Mercury II, produced in 1946, also used a rotary shutter . This was a half - frame 35mm camera . </P> <P> Another shutter system is the leaf shutter, whereby the shutter is constructed of diaphragm - like blades and can be situated either between the lens or behind the lens . If the shutter is part of a lens assembly some other mechanism is required to ensure that no light reaches the film between exposures . </P> <P> An example of a behind - the - lens leaf shutter is found in the 35 mm SLRs produced by Kodak, with their Retina Reflex camera line; Topcon, with their Auto 100; and Kowa with their SE - R and SET - R reflexes . </P>

Where is a diopter located on an slr camera