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Amazon.com : Sigma 300mm f/2.8 EX DG IF HSM APO Telephoto Lens for Canon SLR Cameras : Camera Lenses : Camera & Photo
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Sigma 120-300mm f2.8 EX DG OS HSM S Canon and Nikon mount lens review: Prime image quality in a zoom?
Which to buy? Older Nikon 300mm 2.8 AFS (non VR) or 300mm f4 e pf (VR)?: Nikon SLR Lens Talk Forum: Digital Photography Review
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