All About Photographic Lenses.
Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
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(link to the lens «Sigma AF 28-105 mm f/ 3.8-5.6 UC-III Aspherical IF» will be added automatically)

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