The 28/2.8 AIS with close focus of 0.2 m is one of the best lenses Nikon ever made. I have this lens, and the 28/3.5 AI. Both are sharp at infinity at all apertures, but the 2.8 is sharper all the way to closest focus, and the fact that it focuses so close is a major advantage for some types of photography. I would not hesitate to get the 2.8 if it is for normal photography. The 3.5 is better for infrared, though. It is a nice lens, but in terms of usefulness not in the same class as the 2.8 AIS.