I set up a Calumet 4x5, and on the ground glass I focused on an old gralab timer. I then photographed the camera with a Nikon D70 w/ 18-70 f3.5-4.5 lens. During the exposure (84 seconds @ f16) I manually flashed the running timer with an Sb-600 speed light set at 1/32 power every 5 seconds.
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