Well, Ive definately outgrown the Kit Lens that comes with the Rebel XT. I mean dont get me wrong, its good for some applications, but as far as any type of sporting even goes its impossible. Now My Friend has this lens here that Ive been usuing on ocassion. Its pretty good and is an affordable price. http://consumer.usa.canon.com/ir/controller?act=ModelDetailAct&fcategoryid=150&modelid=7345 Now its really hard to keep that from shaking without a tripod, as it has no image stabilizer. Ive been looking at this lense which to me seems to blow my friends lense away for the same price. Can you tell me how this lense compares and which would be better for Motocross Photog. http://consumer.usa.canon.com/ir/controller?act=ModelDetailAct&fcategoryid=150&modelid=11922 Thanks Alot.