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Title: Sigma APO Teleconverter 1.4x EX DG for Canon Digital SLR Cameras
Review: I did a lot of research on this item before I bought it. Nowhere did I read a bad review or rating and most buyers raved about how their pics remained sharp as a tack with the Sigma 120-300 mm f2.8 lens, but this is not what I experienced. All my pics are now slightly out-of-focus when I use this lens so I no longer use it and mark it off as a bad purchase.
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