This is currently the widest-angle lens you can get for Nikon DSLRs, other than a few fisheyes and the remarkable Sigma 8-16mm which was introduced in 2010. But that's not the only reason to take it for a spin. Reviewers have noted that it's sharp and well-built; and the focus is fast and quiet. And for such a reasonable price too. What more could you want?
COMPATIBILITY NOTE (1): This Sigma lens is for Nikon cameras only.
COMPATIBILITY NOTE (2): This lens carries Sigma's "DC" designation. It will not deliver a full-frame image on a D3 series, D4, D600, D700 or D800 camera.