Hi! I was about to invest in 35mm 1.8 DX lens for my nikon d700 but then i realized that DX lenses may not be a good idea for a full frame camera. This doubt was cleared on the Ken Rockwell site where he said not to go for DX lenses. Is there a 35mm block lens which would be compatible with the d700 and give the proper result without any cropping? Please help...
Any Nikon lens that does not have the Term DX on it will work on the D700 in FX mode, with the few exceptions listed in the manual. So the 35 mm f/2 will work just fine. The term you are looking for concerning Dx lenses is not vignetting, as that refers to the propensity of some lenses to show some darkening in the corners of the image when wide open. A DX lens, with the exception of some very wide ones, will not fill the FX frame and you would see am image that looks like it was shot through a black card with a hole in it. If you already own DX lenses, you can use them in DX mode on the D700, but it will be a 5MP not a 12 MP image due to the fact that a DX frame is less than 50% of an FX frame. So you should not purposly buy a DX lens for an FX camera.
The 35/1.8 actually works quite well and is exceptionally sharp on the D700, in FX mode, with only modest vignetting between f/1.8 and f/4. Beyond f/4 the vignetting gets stronger as the border of the image circle gets more pronounced. So I sometimes borrow this lens from my wife and use it on my D700, but I agree with the others, I would not specifically buy one for an FX camera.
I agree that the Nikon 35mm f/2 AF-D is quite a wonderful lens--light weight and super sharp. You won't be disappointed. I use it occasionally on my D700, although most of the time it stays on my wife's D200, where it serves beautifully as her normal lens.