Athabasca ARK II ND1000 are made of German Schott B270 optical glass. The use of Schott optical glass gives our square filters excellent properties of chemical resistance, high temperature resistance, and abrasion resistance. With an ultra-thin, noble metal multi-coating, Athabasca square filters are with low reflection and able to avoid color differences while also good at reducing light steady.
Material : German Schott B270 Optical Glass.
Coating : Water repellent, Stain and scratch resistant.
Double-side anti-reflective coating.