Sigma 17-50mm f2.8 EX DC OS HSM now Available
Sigma’s newest lens the 17-50 f2.8 followed by acronym hell is now available. Let’s break down those acronyms and features EX – A nicer fit and finish on the exterior of the lens. Sigma uses the word Superior. DC – Designed for smaller, crop-sized sensors OS – Optical Stabilization, Canon...

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