Try putting the camera on a higher F-stop, something like F.13, then put the lens on infinity ( this will give you deep DOF ) also set it to full manual. I too have the D7000 and i hope nikon is going to add something like 60p recording.
This was a quick test with the focus thing.
I do not recommend stop down much under f/8, diffraction will eat a lot of sharpness in these very small lenses. f/16 is already very soft with 14-42 GH2 kit lens. With high quality primes it's slightly different, but even with my Phase One medium format camera i can see a lot diffraction after f/16. I recommend using ND filter rather than stop down under f/8-11.
Kari
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