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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


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Old February 26th, 2010, 09:58 AM   #1
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Autofocus and video with the T2i (or any DSLR shooting video)

The new crop of DSLRs that shoot video have really piqued my interest, but one thing I haven't seen much on is how autofocus works (if it does) when shooting HD video. It's not a dealbreaker or anything, I'd just like some info. The ability to change lenses (shared with my 40D) makes this a very tempting piece of equipment.
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Old February 26th, 2010, 10:16 AM   #2
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The Canon DSLRs have only a slow contrast push focus.

But on the other hand i knew no professional camera with a big sensor (APS-C or FF) that have a continous autofocus - so that is not a "problem" of DSLR.


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Old February 26th, 2010, 12:13 PM   #3
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The Panasonic GH1 does continuous autofocus, at a sufficient speed, while recording. It can even be set to track faces. Of course, the sensor is slightly smaller than APS-C.
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Old February 26th, 2010, 11:58 PM   #4
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The GH1 is not a DSLR and because it does NOT use a mirror, the camera is able to autofocus while shooting.
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Old February 27th, 2010, 08:13 AM   #5
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Many DSLR's since the Live-view days have been able to do _slow_ contrast based AF. There have been some optimizations in firmware updates, but it's still slow.

Panasonic made it a point to work on making it faster, hence AF on their m43 bodies are much faster than the Olympus EP series.
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