What do you guys think of this lens for an affordable wide angle. Reviews from amazon, and Ken Rockwell are favorable, and I think this is the best I can afford! Does anyone out there have any opinions on build, handling, speed, and picture quality? I am looking to take scenic photos with this lens on a D80 - for pleasure. I currently have an 18-105mm VR and a 50mm 1.8 as my main lenses and would like to round out the collection. What do you guys think?