Dad has completed the mk2 version with lasers able to focus to a much smaller point on the focal plane. Thanks again all for the assistance and to Niglyn for the code and the idea
I did produce a very crude mask with 1mm holes and it did read faster speeds above 1/500th as you say. On a Leicaflex, the 1/2000th went from about 1/800 to about 1/1200. Work, at least the ‘thinking’ part has already started on the Mk2 version!
Thanks to Niglyn and the other contributors to this thread, I have a shutter tester, courtesy of my Dad‘s electronics, and other, expertise. Details attached!
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