charjohncarter
Veteran
He had a shutter tester that he ran my IIIf through many times, and a little googling shows that it is a Camlogix SH-T2 shutter speed tester. But Camlogix appears to be offline now, so I can't say what sort of shutter tester it is.
The IIIf has some variance in its shutter, and being 60 years old and entirely mechanical, it's not going to be spot on always. When he tested the camera, he would test, turn some screws, retest, get it as close as possible, then run through other shutter speeds, and discover that it had gone inaccurate on a different shutter speed, so it would be back to testing there, then running through everything again, to get it as accurate as possible across all shutter speeds, which again, with the old mechanics, isn't dead accurate, and couldn't be expected to be.
This is by way of saying that I'm guessing that the tester is probably accurate to a much higher tolerance than an old Leica mechanical shutter can ever be.
That's good enough for me.