I built an Arduino based shutter tester. I'm not sure it's very accurate or consistent when trying to use faster shutters speeds (that's what I want to convince myself of anyway after recording some results!) as it fails to record a result a lot of the time.
I did some tests on 3 cameras where I fired each shutter speed 3 times then averaged the results. Not a great sample, but I ran out of enthusiasm!
If these are indicative of the cameras shutters, then I conclude:
The Minolta is consistently inaccurate, slow by about 20% (a good B&W camera! which is good since it was given to me to give to a youngish lad down the street interested in B&W film)
The Mamiya ProTL was spot on to 1/8sec, then got slower and slower until the 1/1000th speed was actually less than 1/500th (actually ranged from 1/453 to 1/493)
The Mamiya 1000s is ok up to 1/8sec then so inaccurate I gave up...
I have yet to try it on my LF lenses... and probably won't!
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