I'm going to be traveling throughout Europe this summer and figured it might be a good excuse to pick up a new lens.
I have a 40D and my widest lens is a 17-55mm. With the crop, I'm worried it might not be wide enough to capture a lot of the landscapes and architecture I'm looking forward to shooting. (I've definitely had situation before where I've wished for something wider.)
I'm looking at the Canon EF-S 10-22mm f/3.5-4.5 USM, Tamron SP AF 10-24mm F3.5-4.5, Sigma 10-20mm F4-5.6, or Sigma 10-20mm F3.5.
I like to stick to Canon lenses, but am wondering if anyone has input on whether either of those others are worth looking at instead of the Canon 10-22mm.