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 First attempt at capturing high-speed motion. This is a Pentax K200D shutter, as seen by a K100D and a high-speed strobe. Timing is provided by a few lines of C bitbanging a PC parallel port (in DOS, with interrupts disabled, natch).

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Via: http://blog.makezine.com/archive/2009/01/dslr_camera_shutter_in_action.html?CMP=OTC-0D6B48984890