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Thumbnail image for circuito shutter speed tester.JPG

Pablo shows off his simple hack for testing the shutter speed of the old cameras he restores: A phototransistor from an old computer mouse, a battery, a flashlight, and a mono audio plug to his computer’s microphone port. He records the pulse in a simple audio recording utility and measures the time between the peaks. [Thanks, Billy Baque!]

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I write for MAKE, serve as Technical Editor for MAKE magazine, and develop original DIY content for Make: Projects.



  1. jason1729 says:

    There’s really not much info given, but how does it deal with the faster shutter speeds where the rear curtain starts closing before it finishes opening…some part will be open for a lot longer than the effective speed.

  2. cranky_EE says:

    is to have multiple sensors spread over the total area of the focal plane shutter. generate an average time based on the total response of all photo sensors.