Singh-Ray 84 x 120mm Daryl Benson Neutral Density 0.3 Strip
Amazon.com : NiSi 100X100mm Square Neutral Density Filter,IR ND8(0.9),ND 3 Stops 100mm System Optical Glass Filter for 52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm Lens,Compatible with Lee Cokin Hitech Singh-Ray : Electronics