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<p>[QUOTE=&quot;Leadfoot, post: 1052788, member: 2972&quot;]Bob, It sounds to me like you got a bad copy of the Sigma.&nbsp; One piece of glass not sitting just right, and out the window goes the image quality.&nbsp; FWIW, the copy I got was superb, but I eventually sold it for the Tamron 180 and then the Nikon 200.&nbsp; I typically work with my local camera shop, who lets me try the lenses before I buy them, just to be sure I get a good copy -- it is not that unusual to find a bad lens (Tamron and to a lesser extent Sigma, but even Canon and Nikon will occasionally send out a bad lens).[/QUOTE]</p><p><br /></p>

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