Originally Posted by javacleve
ok, good point. The 100mm is the part that concerns me, though...seems like 200mm is what is recommended (and that makes it humongous!!!)
Don't forget the crop factor. 100mm on a T1i is like 160mm.
And a 70-200/2.8 lens is big and heavy. But you could also use the Sigma 50-150mm f/2.8, which is like 80-240mm, and it's a lot smaller and a lot lighter (though it's still bigger and heavier than the Canon 100/2.0.)