WIDE ANGLE - Nikon 28mm f/2.8 AI: 1974-1981 Nikon's manual focus lenses are better in fact than any of the newer fixed 28mm f/2.8 autofocus lenses! This 1970s AI version outperforms most other lenses, although the current 28mm f/2.8 AI-s is even better. Ken Rockwell got one for $50 from eBay. The AI version excels in sharpness and contrast, and has no distortion unlike zooms or the AF versions. The AI-s version is even a little bit better, but costs a little more.