Negative Positive
Title: unhappy
Review: I read with interest the three previous reviews. Unfortunately, I have poor results with this lens. My particular lens required warranty in the first month after purchase. Subsequently, I have returned this lens to Sigma two additional times. The picture quality has gotten worse each time repairs were made, to the point now where the lens is unusable. For my particular type of photography, the advertisements for the lens indicated that it would be a winner. The folks at Sigma have proven to be a huge disappointment.
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