The easy answer would be the manual focus Zeiss primes. Although they may win in quality, have an aperture ring (required for full manual video control), and a manual focus ring; it’s too easy to just point to the lenses with the highest price tag. When you have the option of 3 very good primes for the price of one great prime, I’d put my money on the 3 very good primes any day. It’s also important to note that these primes may well be out of the price range of the average D7000 owner, especially if the purpose of the lens is based solely around video applications. As the D7000 is cropped sensor you can get a darn nice Nikkor 35mm DX 1.8 for $185. But then again you loose the aperture ring and a focus ring designed for manual focus. Honestly I think your best bet is to meet in the middle and opt for a manual focus Nikon AIS lens. Still a bit more expensive then the 35mm dx, but the aperture ring, manual focus ring, and amazing sharpness are worth it.
After I came to this conclusion I picked up a Nikon NIKKOR 50mm f/1.2 AIS Manual Focus Lens from BH for $650. I’ve had it about 2 weeks, and thus far it has been an absolute joy to shoot with!
Did I make the right decision? I honestly have no idea, but the footage looks pretty damn good. This was shot entirely on f/1.2 with terrible lighting: http://vimeo.com/17357549 and this was shot at night with lots of bright lights: http://vimeo.com/17477695. Hopefully I’ll have some test footage soon with daylight.
Now I’m thinking about pick up the NIKKOR 28mm f/2.8 AIS Manual Focus Lens.
Any other Nikon users out there have a favorite lens that pairs well with video?