Title: Try and try again!
Product review: Looking for a wide angle and a friend of mine really liked her Sigma 10-20 saying it took sharp pics. So instead of investing in the Canon for alot more I ordered the Sigma. The first copy was extremely soft wide open and closed down. Sent it back for another copy which was alot better wide open but at about f11 on up it got softer and softer, not sharp at all at f32 which seems odd since you'd think wide open would have the issues. I exchanged this lens three times! The last three lens were all the same. Thinking somethings up or it's just typical for this lens, I called Sigma. They advised me to send in my Canon 50d with the lens and they would check it out. Seems there's firmware in the lens which may not be reading my camera correctly, or at least that's how I interpreted it. Haven't gotten it back yet, will let you know if there's any change. Just beware, check the lens out as soon as you get it.
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