Originally Posted by
Jim Galli
I question the ability to measure a pentagonal hole for area with a caliper. The way I've measured in the past is quite different. Warm up a light table. Open the barrel aperture to f16 or so. Stick a 1 degree light meter right down in the throat and take a reading. Sure it's meaningless, but you'll notice it changes in tenths (at least with my minolta) with the tiniest adjustment of the aperture, so it is measuring a quantity. Measure the G-Claron barrel first. Then open the Compur and the Copal to indicated f16 and take the same reading. See how much you have to gently move the aperture scales to get the identical reading with the other shutters and see if it's as drastic as what you found so far. I'm saying the barrel and the meter are the "known".
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