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| p.1 #11 · How to photograph projected images? |
If it's 60hz, you want to make sure to capture a whole number of cycles, i.e. 1/60, 1/30, 1/20, 1/15, 1/10.... I'm guessing that 1/15 is cited as the best time because of minor discrepancies between the projector and camera in terms of exact fractions of seconds.