Dave Nelson - Atlanta, GA , Sep 08, 2005; 04:02 p.m.
The sensor was probably dirty the day it came out of the factory. It is a common problem.
It is my experience that wide angle lenses are not sharp lenses in general. Begin by stopping the lens down to f/8 and seeing if that improves your results. I would still expect it to be soft around the edges. Do a search for wide angle lenses that include examples and see if you are getting similar results.