I have a friend who has the nikon 35mm F1.8 (DX) lens and we were curious to know how it performs on a full frame(FX) camera, and whether the vignetting will be severe in FX mode. After testing it for awhile, yes, vignetting is indeed quite severe, though if shot at F2.8 and with the camera's in-built vignetting control set to "High", it can be quite acceptable, especially for close focus subjects. If you know the limitations of this lens on FX camera, I believe it can really take great pictures, especially it being a very sharp len. Its sharper I feel, than the 35mm F2(FX) lens due also to the very precise AFS focussing, and also has better corner sharpness. Using it at F1.8 or more than F8, however, creates the dreaded severe vignetting, so if you have full frame, using a FX lens is still more versatile. Here are some image samples from some casual snapshots with that lens, all shot at F2.8 and with Vignetting Control set to High. Pardon the uninspiring pictures, they were taken on a dreary and cloudy day, and were unedited straight out of the camera except for resizing.