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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 HSM OS Autofocus Lens for Nikon {95} with Tripod Collar/Foot at KEH Camera
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