Having created a stir with my last post (effectively 'will DX dissappear') I now need to pose a supplementary question: I have several decent DX lenses and I wouldn't want to fork out a huge amount of money to replace them immediately if I went for FX. It was suggested to use a D800 in DX mode, however I'm not entirely clear whether I'd be losing anything. Nikon quote 15 megapixels for the D800 in DX mode. That's actually better than my D200 so I'm not losing out there. I've heard that there may be vignetting problems using DX lenses on an FX camera - does that still apply if using DX mode ? Is vignetting in this case more of a problem on wide or tele lenses ? - I'm particularly keen not to have to replace my newish 200-500mm DX lens.