Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Low Light Auto Focus not good

I purchased this lens to shoot professional bodybuilding show. There are numerous challenges shooting in these low light conditions with the subjects being very dark. The lens didn't focus sharply in these conditions and I returned it. I did shoot some outdoor photo's with the lens and they looked very good. For the money this is a great lens, but if you are going to use it to shoot weddings or other events that may require you to shoot in low light conditions you might want to look else where. For a good alternative check out the Canon 28mm - 135mm IS, even though it is a f/3.5 - 5.6 with the IS you can take great pictures with it in low light conditions and with the extra zoom and the price at about $230 makes it a great deal.