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Sigma 50-500 on Pentax: Pentax SLR Talk Forum: Digital Photography Review
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![Sigma 50-500mm F4.5-6.3 APO DG OS HSM [REVIEW]](https://digital-photography-school.com/wp-content/uploads/2012/03/PeterWestCarey-CameraAwesomePhoto5.jpg "Sigma 50-500mm F4.5-6.3 APO DG OS HSM [REVIEW]")
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Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Pentax Digital DSLR Camera : Slr Camera Lenses : Electronics - Amazon.com
