Product picture - FotodioX WonderPana FreeArc Core Unit Kit for Sigma 20mm Art Lens with 145mm Solid Neutral Density 1.2 and 6.6 x 8.5" Hard-Edge Graduated Neutral Density 0.6 Filters FotodioX, WonderPana, FreeArc, Core, Unit, Kit, Sigma, 20mm, Art, Lens, with, 145mm, Solid, Neutral, Density, 1.2, 6.6, x, 8.5, Hard-Edge, Graduated, Neutral, Density, 0.6, Filters Click the image to close this page