Walls, Thats like saying "I drive Chevy". Theres a lot of info to Lenses. Im not pro by ANY MEANS but I noticed a huge improvement with a nice I.S. USM lense. I.S. (internal stabilizing) made for a nicer/crisper image for me. Especially while panning through the corners. Just shooting stationary pit pics its not really necessary but with the action shots its great. Just trying to help, hope i did a little.