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Amazon.com : 86mm High resolution Pro series Multi Coated HD 3 Pc. Digital Filter Set for Sigma 150-500mm f/5-6.3 DG OS HSM APO Autofocus Lens, 180mm f/2.8 APO Macro EX DG OS
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What is the Filter Thread Size of Sigma 150-500mm F5-6.3 DG OS HSM?