Au cas où, le 35 mm DX f/1.8 est compatible sans perte de champ avec le D800, en mode FX, je crois, et en mode 5:4 (très peu pénalisant / mode FX : 30 MP et viseur quasi identique), ou en mode x1,2).
http://robertgiordano.blogspot.fr/2012/05/nikon-d800-vs-nikon-d7000-with-dx-lens.htmlEt, lu sur un fil US :
"First thing to try: some DX lenses mostly (or fully) cover the FX frame, so you might not be as bad off as you thought.
So you have some experimenting to do: turn off the Auto DX option and set FX Image Area and try out your old DX lenses.
See what you can use them for.
Don't forget the 5:4 option if your new camera supports it.
The 35mm f/1.8 DX works very nicely at 5:4 on FX bodies, for example."