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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

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.

  • jason1729

    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.

  • cranky_EE

    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.