B+W 72mm ND 3.0-1,000X with Single Coating (110) This filter uses our standard B+W F-Pro filter mount, which has a front accessory thread and is made of brass. Each glass surface is vacuum coated with one layer of Anti-Reflection coating. This single layer helps to prevent internal ghosting and reflections. It also improves light transmission from approximately 92% (uncoated glass) to over 98%. Manufactured from Water-White Schott Glass