in the following 30 years the vast majority of slrs standardized the layout of the controls. the film was transported from left to right, so the rewind crank was on the left, followed in order by the pentaprism, shutter speed dial, shutter release and the film advance lever, which in some cameras was ratcheted so that multiple strokes could be used to advance the film. some cameras, such as nikon's nikkormat ft cameras (marketed under the brand-name 'nikormat' in european countries and elsewhere) and some models of olympus om series, deviated from this layout by placing the shutter speed control as a ring around the lens mount.