I thought that was only the case with scanning display devices like CRT monitors particularly with interlaced feeds.
I don’t recall having any issues shooting plasmas or LCD projectors synced at 75Hz on HDV cameras with a shutter speed of 1/50 (PAL 25fps 1080p)
I’ve got a plasma a 7D and an HDV camera in my studio so I’ll shoot a couple of tests with the same shutter speeds.
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Best Regards
Mic Pool