i looked all aver the net and i did not find a Camera Raw profile for this wonderful lens, the best ultra wide angle for APSC sensor, so decided to make one.I used Ti1 as my Ti2 550D is at the service center right now as the viewfinder lcd failed. The photos were made with tripod and stand, Raw, mirror lock up, remote, and so on. All the focal lengths 11mm 12mm 13mm 14mm 15mm 16mm and the biggest target with the most info, so enjoy! You can download the file HERE, then just import it into Camera Raw presets. It would correct the Geometric distortion, Chromatic Aberrations and Vignetting automatically at all focal lengths. Happy shooting!!!
if you wonder where it is on the PC:
mine is here on my Windows7 C:\Users\dark eagle\AppData\Roaming\Adobe\CameraRaw\LensProfiles\1.0
dark eagle is my user name so yours would be different respectively.