I have a question about two different lenses. I'm in the market for a zoom lens and I'm stuck between these two lenses. The Nikon 80-200mm 2.8 ED and the Nikon 70-200mm 2.8 ED. Exccept for the price and the additional 10mm, I don't know the difference. My main concern is image quality and the f/stop of 2.8 which is nice since I like to do a lot of low light photography and sports photography. Thanks for any help. ~Crawn p.s. the cameras used would be the D70s and the D200.