I have a nice fujinon 150mm lens mounted in a copal shutter. I'm pretty sure the slow speeds are way way off but would like to test it.
Has anyone ever tested a shutter's accuracy by using audio analysis? I don't have a shutter speed tester and I don't want to buy one, nor do I want to waste half a dozen sheets of film trying to find out what the real shutter speeds are.
What I mean is, set up a microphone near the shutter, open an audio recording program, set the shutter then trip it.
My idea is that you should be able to hear the shutter when it opens, operates and then closes, and you can measure the audio signal very accurately down to thousandths of a second.
Will this work or am I missing something?
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