Older cameras (and some newer ones) use mechanical shutters that creep out-of-spec over the years, so [Dean Segovis] built a handy shutter speed tester ... OLED screen. An Arduino naturally ...

Does the shutter still operate as it should? How long is a split second anyway? You need a shutter speed tester, and luckily ... These feed an Arduino which is hooked up to a TFT display, and ...