All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
The lens has a lot of design cues from the Sigma APO lens of the same designation. It is very sharp with good contrast from 75mm to about 200mm but soften after that. Overall, a decent perfromer.
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