It is an extra-wide-angle manual focus lens designed for APS-C crop sensor mirrorless cameras. With low distortion and wide angle, photographers who want wide-angle photos such as landscape and architectural images can create satisfactory images. F2.0 is very bright so it captures clear and vivid images even under relatively dark environment. The independent NCS (Nano Coating System) technology was used. It creates even lower reflection rate than the original UMC (Ultra Multi Coating) and higher contrast. Also, the light penetration rate is very high to minimize flare and ghost. Optical construction of Samyang 12 mm F2.0 NCS CS features 12 lenses in 10 groups - among lenses, there are 1 glass aspherical lens (AS), 1 hybrid aspherical lens (H-ASP) and 1 low-dispersion lens (ED) to provide high image quality. H-ASP minimizes color aberration to realize exceptional image quality and high contrast for center and corner of image even when aperture is fully opened. ED lowers unnecessary light dispersion to drop color aberration effectively.