Persistence of vision How we see
To eliminate screen flicker when filming a computer screen try setting your camcorder to a shutter speed of 1/50 or use a slow 4x (or LP) recording speed. If this doesn't work try experimenting with similar settings until you find one that works for your screen refresh rate.
You may find that your Camcorder has a special mode (Canon call it "ClearScan") to enable you to film monitors.
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