SmallRig Cine ND Filter (4 x 5.65", 6-Stop) 1.8 Optical Density, Multilayer Nano Coating, 4mm Thick Schott B270 Optical Glass, Waterproof and Oil-Resistant Coating, Compatible with 4 x 5.65" Matte Boxes, Darkens Entire Image Area, Allows Reduced...