I really love this lens... despite there being a small flaw in it I can't do anything about.
This is an example of Nikon's 20mm f/2.8D AF wide angle lens... and something that is rarely out of my camera bag.
The compact ultra-wideangle lens construction with Close-Range Correction (CRC) system offers 94 degree picture coverage with edge-to-edge sharpness.
Do I sound like a salesman? 
While I often use this lens for landscapes and seascapes, it also comes in handy for capturing images like this:
and this











...but I am very familiar with these chains. 























