I was using my Canon 24-70 f2.8...... Love the lens. My kid was in the show and I was trying to get shots if him. Belle looked ok, but he was more in the shadow area and it was grainy. Since I'm shooting a moving 5 year old I like to stay at at least 1/100th if at all possible, with a 2.8 app. Low light photography is my nemesis. Still trying to get good focused shots of kids in low light, with no noise, and without using flash. For me , this is mission impossible. :-(. Other photographers seem to do a better job and I can't seem to find the secret formula/balance.