This is the Micro-Nikkor 55mm f/2.8 AI-s lens. It's among the sharpest glass Nikon has ever made and is capable of razor-sharp pictures at close focus as well as great results in ordinary photography. It is manual focus, so photography with this lens is slower, more deliberate, and more precise than when using any of the auto-focus lenses. It would probably be my last choice for taking action shots at a sporting event.
The lens is capable of 1:2 life-size reproduction, and with the PK-13 extension tube, 1:1 life-size reproduction. It is compatible with almost every Nikon camera, from the Nikon F all the way to the Nikon D300 and D3 cameras.
Examples of pictures from this lens:
From My Camera Equipment