NCS (Nano Coating System)Samyang 10mm 1:2.8 ED AS NCS CS is the first Samyang Optics lens featuring a nano crystal anti-reflection coating system. This technology provides lower reflection factor than the UMC system as the coating is now applied more evenly on the surface of the lens. Benefits brought by the nano crystal layer include better light transmission, increased resistance to reflections and higher contrast, and all of this translates into supreme optical resolution of the lens.