I've been AWOL from TPF for a long time, but now I'm back, with and XTi!! YAY!! Finally. Anyway, I've been doing some searching as to what would make a good walk around lens and referencing Don's Photo (Don's Photo | Home) for these lenses. What I really want to know, aside from the obvious "Canon" lenses, how do I know which ones will be compatible? I haven't been able to come across a thread discussing this.