All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
Abbreviation used by Sigma to mark Optical Stabilizer Function in their lenses. Usually contained in lens name eg. (18-50mm F2.8-4.5 DC OS HSM) Translated to Canon terminology it equals to IS (Image Stabilizer)
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