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Author Message   Mattthegamer463 Tinkerer Username: Mattthegamer463 Post Number: 3 Registered: 06-2013 Rating: N/A Votes: 0 Posted on Thursday, June 20, 2013 - 03:54 pm:    I think the optical attachment would work fine with a focal plane shutter, any point on the shutter will be open to light passing through the same amount as any other, so the readings should be fine. I built a device with a single sensor that measures the light duration and displays on a LCD, it is accurate down to 1/1000th with no issues.