by edmund_yung » Fri Sep 23, 2011 12:29 pm
I would suggest 55-250 IS, at f5.6 and 400mm, IS is invaluable, moreover it's cheaper than the Sigma you mentioned. Try get a second hand too!
Oh about that taking photo of Linda, just boost your ISO to compensate that slow f5.6, 60D high ISO isn't that bad. It surely can't match a 70200f2.8IS, but surely kick any super zoom P&S out there.