Made with Schott B270 German optical glass the finest available precisely ground to ensure brilliantly sharp images with no ghosting. Ulca Multi-Coating decreases flare and significantly Reduces chromatic aberration (average transmission > 99.0% @420-680nm). Nano wmc Multi-Coating is scratch resistant and repels water dirt and oil from Smudges and fingerprints making the filter easy to clean. IR ND coating maintains faithful Color rendition by eliminating Color shift caused by unwanted Infrared and uv light.