Welcome to the TDP forums!
Originally Posted by canon-ball
The only true Canon ultrawide angle lens for a 1.6x crop body like yours is theEF-S 10-22mm f/3.5-4.5 USM. Personally, I stay away from 3rd party lenses - for example, Sigma lenses tend to have autofocus problems on Canon bodies. However, the Tokina 11-16mm is well regarded.
Keep in mind that with any ultrawide lens, you'll get some distortion.
You'll absolutely want a tripod for your landscape shots - and if you get a head that pans (a ballhead with a panning lock, or an actual tilt-pan head), you can make wonderful panoramas without distortion, by using a more normal focal length lens and stitching the images together. There are numerous tutorials on stitched panoramas.
For a general purpose lens for your T2i, I absolutely recommend theEF-S 17-55mm f/2.8 IS USM- excellent optical quality, covers wide angle to short telephoto (the 'walkaround' range), fast and constant f/2.8 aperture, and image stabilization. All around, a great lens.
Reply With Quote