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On the subject of 'how good a still from a video'. I was just considering the info flow needed. If we said video is roughly 30 frames/sec and a decent still photo jpeg is 3Mbyte then the camera would need to be doing 90 Mbyte/sec or 720 Mbit/sec. I think the fastest flash cards are of the order of 90Mbit/sec, so that would mean they're still way off a decent still for each frame - and that's in jpeg format rather than bitmap. Is onboard memory faster? Is my maths ok?
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