Re: Narutard chat thread
The D800 is essentially the D7000 but with a larger sensor, meaning higher imagine quality and significantly improved low-light performance.
As for the lenses, older AF lenses had the gearing but used a motor built into the camera. However, newer AF-S have the autofocus motor built into the lens so the newer cameras don't have the motor built into them anymore. As a result, you have to manually focus some lenses on some cameras, but other than that most standard Nikon lenses will work on newer cameras regardless of age.