A Thornton Pickard roller blind shutter, very useful either front mounted or between the lens and the lensboard. I have a few, last count about 50 in various sizes. An alternative is a Focal plane shutter it fits the back of a field camera, I have one TP version for High speeds to 1/1000 and another unknown make I need to restore.
Other alternatives are studio shutters I have two Thornton Pickards and a Norka plus 3 or 4 front mounting shutter with one instant speed of approx 1/50. So shutters are not an issue.
Ian
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