The Nikon AF-S Nikkor 20mm f/1.8G ED ($799.95) is just one of many in the company's series of f/1.8 prime lenses. It's the widest of the bunch, but even when shot at its maximum aperture it is quite sharp in the center.
Ultra-wide field of view; Wide aperture; 7.8-inch close focus
Some edge softness unless stopped down; Modest barrel distortion; Lacks optical stabilization