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Author Message   Steve_s Tinkerer Username: Steve_s Post Number: 118 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, March 15, 2008 - 03:30 pm:    You are right about the curtain-speed x slit, of course, but I haven't seen a shutter yet where the curtains didn't speed up across the frame. Maybe some are better regulated. My home-made tester is of the type that plugs into my computer sound board. It has a phototransistor near the start of the frame, one in the middle and one at the end, at 15 mm spacing. This means I can measure the time each curtain takes to travel between each of the phototransistors, and calculate the speed. I don't know about the "shoo-oop", the Exakta is more of a "ker-thunk"!