OK a few of my lenses are too wide or protrude too far to use with the Sinar Auto Shutter. Is there a shutter that can clamp on (and with variable diameter) to the front of a lens?
If not, will this work: make a rectangle with a square hole cut in it big enough to view the entire front lens element. Have another rectangle cut with a slit of same width but of varying heights. Incorporate a system that will keep them together while the one with the slit starts with slit above the opening and slides (free-falls) past the opening and stops once the slit has completely cleared. It would be solid above and below the slit to prevent light passing other than through the falling slit. Workable? I calculate that a 1" slit would be roughly a 1/15 s exposure, a 4" is 1/8 s and 1/4" is 1/30 s - can someone confirm? (I just simply used that d=16 t ^^2 (d= 1/2 g t-squared) )
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