I agree with Tom. Supposedly these lenses are not compatible with the smaller cameras - in fact I somehow got the impression that they basically only work with the D3 family. So when I got my 85, what did I do? I put it on the D2x. It doesn't seem to be limited in any way (and it certainly works), although from what I remember, it did come pretty close to touching the front of the prism. Then I put it on the D100. That also worked, although from what I remember, I had to be tad careful if I needed maximum rise and exactly the wrong combination of tilt. As with Tom's experience, I haven't ever had an issue in practice. I'll admit that I do usually use it on the D3, not because it fits better but because it's my only camera with LiveView. My guess is that the D800 is like my D100, meaning that specific extreme combinations may touch the prism.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!