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The Sigma APO 70-200 F2.8 EX DG OS HSM is a large aperture, telephoto zoom lens that incorporates Sigma’s original Optical Stabilization (OS) function. The lens covers a medium telephoto range of focal lengths from 70mm to 200mm and has a large maximum aperture of F2.8 throughout the entire zoom range. The OS function offers the use of shutter speeds approximately four stops slower than would otherwise be possible.
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