Cokin NUANCES 84x84mm Neutral Density Filter 2.4 - (256X), 8 Stops, P-Series - Multi Layer Coating Schott Glass Filter Cokin 84x84mm Neutral Density 8 Stops (2.4) Schott Glass Filter - Removable Foam Mask Professional filter dedicated to outdoor photography (long exposure times) and/or DSLR filmmaking to reduce the depth of field True neutrality due to the excellent consistency of the transmittance in the visible and infrared spectrum Up to 3 Nuances ND filters can be stacked together without color cast Multi Layer Coating with metallic alloy film on both sides of clear glass - this coating process produces a true neutral image, free from infrared contamination (flat curve)