The controller has 3 settings that produce different DC voltages for the motor and produce different speeds to the spindle/shutter that results in different shutter speeds. The videos below show the 3 speeds and all these clips have the shutter set to 170 degrees. My first attempt at the linkage had the effect of a tiny amount of open shutter after firing a single frame so Ive rejigged the setup by turning the camera mech 90 degrees.
Below is shuttle cycle showing pin registration during exposure. So the linkage is set up right.










This image shows something I always liked. This is the view down the optical light ‘lens’. It narrows and focuses the beam to a tiny slit. Cleaning and correct alignment of this can vastly improve your sound playback of optical tracks.