tom, l,ve been using the sigma 18mm-200mm f3.5- 6.3.. two of my last compositions, ((except macro of course )) the others are sigma 18mm-125mm, they are a good lens, but l still dont think as sharpe as canon or nikon. have saying that.. most please with my sigma, but must admit for the 100mm-400mm f4.5 f5.6 range going for canon .

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