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DxOMark test: Sigma 50-500mm f/4.5-6.3 APO DG OS HSM vs. Nikon 80-400mm f/4.5-5.6G ED VR - Nikon Rumors
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Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Nikon Digital DSLR Camera : Slr Camera Lenses : Electronics - Amazon.com
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Amazon.com : Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Nikon Digital DSLR Camera : Slr Camera Lenses : Electronics
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