I built a shutter speed tester based on the really simple circuit that's floating out there (like this one - http://static.photo.net/attachments/...W-10288684.pdf). For the phototransistor, I used the Radio Shack 276-145. Testing with the Supermatic shutter, I am getting values up to 1/50 and then after that, the values are the same. like 1/125th, approximately, so I don't believe that 200 and 500 are at all accurate.
I had heard that people had similar experiences with that circuit and I was wondering if anyone had improved faster shutter performance by using a different phototransistor. I've seen mention of different phototransistors like the BPW40 and others. Will this make a difference, or are there other factors that I can change that will affect this?
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