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WonderPana XL Filter Holder for Sigma 14-24mm f/2.8 DG HSM ART Lens (C – Fotodiox, Inc. USA
NiSi S6 150mm Filter Holder Kit with Pro CPL for Sigma 14-24mm f/2.8 D - ColorTexturePhotoTours
Amazon.com : Hakuba Haida HD4325 Square Filter System for M15 Series, Adapter Ring for Sigma 0.5-0.9 inches (14-24 mm), F2.8 DG HSM Art Lens Only : Electronics