anythoughts on how it would do in lowlight? I am guessing not that great.
If you're shooting from the taping section at an outdoor daytime show, this lens probably wouldn't be too bad, but in the dark, its gonna be hard to get a decent shot because its just not fast enough. The F/4.5 will only be at the 80mm end and will grow to f/5.6 at the 400mm end...for concert shooting I'd say you'll need at least a 2.8
Also, I forget the rule, but its something like if you're at 400mm you'll need to shoot at least 1/400 to get a steady shot...something like that, I can't remember exactly. But trying to shoot at 1/400 at 5.6 in a dark room is next to impossible.
For daytime it probably wouldn't be too bad, but I know lots of pros stay away from those types of lenses as they get real soft on the ends because the lens can't be zoomed that much and still stay sharp. Thats why lots of people uses prime lenses over 200mm because its the easiest/cheapest way to get a fast sharp lens. Still, for an amateur just wanting to get out and play a little with a zoom lens, I bet that it'd be a great lens for that and the price seems good. I know I paid $1250 for my Canon 70-200mm 2.8L
Another good alternative would be the Canon 70-200mm 4.0L - still not a great lowlight lens, but its canon pro glass, its sharp, and the zoom would still be great for outdoor shooting and its only $400-$600.