Hi, I'm new to posting on the forum. I just got a T2i around April and found this forum a couple of months before I bought my DSLR. It is a very helpful site. I'm looking to buy a new wide angle lens. I was thinking of buying the Canon EF-S 10-22mm f/3.5-4.5 USM because I can get it cheaper than the others and I wanted to get as wide an angle as possible. I also want to get the Canon EF 16-35mm f/2.8L II USM or the Canon EF 17-40mm f/4L USM. So, I guess I have 3 questions. Does the 10-22mm have the widest angle? Is the 16-35mm better than the 17-40mm because of the lower f stop? And, if I get the 16-35mm or 17-40mm, would it replace the 10-22mm or should I keep the 10-22mm because it has such a wide angle?