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Amazon.com : Sigma 120-400mm f/4.5-5.6 AF APO DG OS HSM Telephoto Zoom Lens for Nikon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
Sigma 400mm f/5.6 APO (manual focus) + 2x TC: my review.: Pentax SLR Talk Forum: Digital Photography Review
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