Product picture - FotodioX WonderPana 145 Core Unit Kit for Sigma 12-24mm Lens with 6.6 x 8.5" Hard-Edge Graduated Neutral Density 0.9 and 145mm Circular Polarizer Filters FotodioX, WonderPana, 145, Core, Unit, Kit, Sigma, 12-24mm, Lens, with, 6.6, x, 8.5, Hard-Edge, Graduated, Neutral, Density, 0.9, 145mm, Circular, Polarizer, Filters Click the image to close this page