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While I do not have any Sigma experience, I do have Nikon 10.5 vs Tokina 10-17. The Tokina is much sharper and controls lens flare much more efficiently than the Nikon does. Plus you can order the Tokina with the lens hood already shaved off. On an FX body you set the Tokina to 12mm and shoot 4 around tilted up 5 degrees. Here is my latest set using the Tokina lens. http://www.dlsphoto.net/Hawaii2015/Hawaii2015.htm
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