Haida PRO II Multi-Coated ND 3.6 4000X 12 Stops Optical Glass Neutral Density Filter, 67mm Made from high quality optical glass Haida PROII Multi-Coated. Extremely resistant to dirt, scratches and water High quality, extreme ND neutral density filter Features front thread for use with multiple filters / hoods. Neutral Density ND 3.6 ( 12 Stop ) ND4000 Filter