Sigma 10--20mm f/4-5.6 EX DC HSM
This lens is for sale. Contact me if you're interested.
It's produced some excellent images but I've moved to Full Frame and thus am selling this APS-C lens.
Samples of the output from this lens are here, and more photos of the lens are here.
View all photos taken: Tuesday, 24th February 2009, This photo: 8:53pm