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Firecrest technology is neutral across the whole spectrum, including UV, visible and infra red
4"x5.65" IRND neutral density filter reduces light by 7 F-stops
Hyper-neutral Firecrest coating is sandwiched within filter, providing protection against scratching and damage
4mm thick filter made in the UK using Schott Superwite glass, the finest optical glass available
Compatible with all 4x4.65" matte boxes
Firecrest ND 4x5.65 ND Neutral density Filter 2.1 (7 Stops) compatible with all 4"x5.65" matte boxes.