Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not Sharp, Not Matter What

Bought this from Amazon at the same time we bought the Sigma 10-20 super wide and the Canon 100MM Macro. Those two lenses are great, this one is a complete dog. Unfortunately, we have been so busy with the other two only recently have we had the need to use this one. The clarity is simply poor at all focal lengths and F stops. Does not matter if hand held, or on a tripod with a wireless flash, it's a dog. Just tried to return it, today is the 31st of May, and Amazon says my return window expired yesterday. Now I'm going to have to deal with Sigma I guess. I'll never buy another Sigma lens.