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Material Type:X4 ND 3-STOP (Option 1) Â |Â Size:77mm 77mm X4 3-Stop ND (Neutral Density) Filter For Camera Lenses – Breakthrough Photography Featuring SCHOTT Superwhite B270 optical glass made in Germany, MRC16, and nanotec nano coatings, the X4 ND is among the most color neutral filters available to photographers. The 3-stop X4 ND features an incredibly durable weather-sealed traction frame that makes getting filters on-and-off a whole lot easier. Constructed of high quality brass CNC machined with our signature traction frame, the X4 ND is easier than ever to attach and remove securely, even with gloves on in cold conditions. Guaranteed to be free from craftsmanship defects for 25 years. Benefits: MRC16 to reduce reflection and to increase surface durability X4 ND is the most color neutral and has the flattest transmission curve of any ND filter, guaranteed. 25 years support Features: SCHOTT Superwhite B270 optical glass made in Germany Nano coating layer technology, called nanotec Durable weather-sealed traction frame Item includes: 1 x 77mm X4 3-Stop ND Filter Plastic Storage Case 1 x Lens Cloth 25 Year Guarantee We stand behind all our products 100%. Each and every filter is guaranteed to be free of craftsmanship defects for a period of 25 years. USA-based customer service phone support email support live chat support