FotodioX WonderPana FreeArc Core Unit Kit for Sigma 12-24mm II Lens with 145mm Solid Neutral Density 1.2 and 6.6 x 8.5" Soft-Edge Graduated Neutral Density 0.9 Filters

This WonderPana FreeArc Core Unit Kit from FotodioX includes a WonderPana FreeArc Core Unit designed to specifically fit the Sigma 12-24mm f/4.5-5.6 DG HSM II lens, as well as a WonderPana 6.6" Holder Bracket. Those items can be combined to allow for the convenient use of two 2.5 to 4.0mm-thick filters measuring 6.6" wide, or one 2.5 to 4.0mm-thick filter measuring 6.6" wide along with one FotodioX 145mm round filter behind it. A compatible 145mm solid neutral-density 1.2 filter and a 6.6 x 8.5" soft-edge graduated ND 0.9 filter are also provided, plus a 145mm inner-pinch lens cap for 145mm FotodioX round filters.