Most newcomers to wide angle lenses think that the primary thing that distinguishes them is their angle of view: a wider lens gives you a wider angle of view on a scene. Yes, you can see more "width" through the viewfinder, but that's actually not the real reason why pros tend to gravitate towards "very wide angle" lenses instead of "modestly wide" ones. The real issue is depth...Full Article...Here
Sigma10-20mm Group
Good review by Thom Hogan and vindicates my choice on buying this lens. Thanks Orb keep up the good work.