I understand there is a DX setting on the D3 for using DX lenses. Does this feature give an Optical Quality advantage over the D700 when shooting with DX lenses; say the 16-85 VR, 70-300 VR, or the 12-24 F4 Nikkor? How do DX lenses usually fare on the new FX bodies? I'm considering a D700 and was wondering if its necessary to duplicate lens sizes; since I am going to keep my D300 for the 1.5X telephoto advantage. I am going on a trip and want max quality for my landscapes and portraits.