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Sigma 17-70mm F2.8-4 DC Macro OS HSM C vs Tamron SP 17-50mm F/2.8 XR Di II VC: What is the difference?
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Sigma 17-50mm f/2.8 EX DC OS HSM (FLD) Autofocus APS-C Lens for Select Nikon F-Mount Cameras {77} at KEH Camera
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