The samyang 12mm f20 ncs cs lens is a manual focus wide angle prime for use with the samsung nx mount of compact system cameras such as the nx3000 nx30 and nx1100 its lightweight 260g construction combined with its large f20 aperture makes this lens perfect for a wide range of applications including travel landscape interior architecture and astrophotography the lens uses nanocrystal anti reflective coating that sits on the lens elements surface to ensure better light transmission