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It's my new lens: Sigma 170-500/5-6.3 APO DG...INFO & pics..: Pentax SLR Talk Forum: Digital Photography Review
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For Sale - Sold Sigma 120-400mm f/4.5-5.6 DG APO HSM K-AF “Excellent+++” FULL FRAME - PentaxForums.com
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Amazon.com : Sigma 120-400mm f/4.5-5.6 AF APO DG OS HSM Telephoto Zoom Lens for Canon Digital SLR Cameras : Digital Slr Camera Lenses : Electronics
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