Jason Chan of BananaMana demonstrates the touch screen rack focus system on the Panasonic GH2.
Many dSLR's are problematic for videography because the lenses are manual focus only. Panasonic GH1 and GH2 have auto focus lenses. The GH2 autofocus is quite a bit faster than the GH1 but the GH2 also has touch to focus which allows one to use the touch screen to rack focus from one subject to another.
Watch GH2 low light test:
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