Thanks Mark. I use the canon 70-200 2.8, canon 200 1.8 and canon 300 2.8 (with the 20D and MKII) for the outside action shots, so the little Tamron has a lot to live up to and I keep wondering if I should upgrade since that is the only one I use for the indoor shots (I just got my first set of studio lights last week so haven't used this little lens too much yet). It seems fine but you know that reaching for one step better all the time...:)