Samyang 12mm F2.8 ED AS NCS Fish-eye is a manual focus lens with a low F number. You may control the lens precisely when shooting under various exposure environment including relatively dark or too bright situations. This lens features 12 lenses in 8 groups including 2 glass aspherical lens (ASP), and 3 extra low dispersion lens (ED) to offer high resolution. Also Nano Coating System (NCS) of Samyang Optics is used to optimize the light penetration and minimizes flare and ghost. With such optical construction, it has 0.2m of minimum focal length to film subjects in near distance.