On needing an F2.8 lens, would that depend on what ISO he'd chose and what WB?
WB has nothing to do with it unless I'm missing something?
As for f/2.8? As any sports photographer and they'll agree, night time sport or indoor sports, you'll want a 2.8. Yes, can can bump up your ISO. When I had an F/4 lens, I cranked up the ISO all the way up on my 40D, opened the lens all the way to f/4 and tried shooting indoor volleyball...it's was a waste of time. Even with my f/2.8, it's rough.
