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Amazon.com : Sigma 70-300mm f/4-5.6 DG APO Macro Motorized Telephoto Zoom Lens for Nikon SLR Cameras : Point And Shoot Digital Cameras : Electronics
Sigma APO Macro Super "goldline" 70-300mm F4-5.6 Lens Reviews - Sigma Lenses - Pentax Lens Review Database
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sigma 70-300 f4-5.6 dg macro verses nikon 70-300vr.: Nikon SLR Lens Talk Forum: Digital Photography Review
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