95mm Pro Series High Resolution Digital Ultraviolet UV Protection Filter for Sigma 150-600mm 50-500mm, Tamron SP 150-600mm f/5-6.3 Di VC USD Lens & an eCostConnection Microfiber Cloth - Walmart.com
Sigma 95mm UV (Sigma DG) Filter at KEH Camera
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Amazon.com : Tronixpro 95mm Pro Series High Resolution Digital Ultraviolet UV Protection Filter for Sigma 150-600mm 50-500mm, Tamron SP 150-600mm f/5-6.3 Di VC USD Lens + Microfiber Cloth : Electronics