Thanks a lot. Thinking about upgrading my 300 for a 400 next season. It'll get me closer, although today I was @ 420mm because I had a 1.4x extender on my 300. The extender gives you the extra reach, but it also makes your pictures less sharp, and you allow less light in that way. Instead of 400mm at f/2.8, I was at 420mm at f/4. Not a big deal during a day game, but it sucks at night.