"The Rokinon 10mm f/2.8 ED AS NCS CS Lens is a prime, manual focus wide-angle lens designed specifically for use with APS-C sized image sensors. Providing a 35mm-equivalent focal length of 16mm and a broad 105.9deg. angle of view, this lens is ideally suited for interior, architectural, and landscape photography applications. One extra-low dispersion element and two aspherical elements have been incorporated into the optical design to minimize chromatic aberrations and distortion in order to produce sharper images. Additionally, a Nano Coating System (NCS) has been applied to the lens elements in order to reduce surface reflections and prevent lens flare and ghosting for improved light transmission and more contrast-rich imagery|Prime wide-angle lens provides a 35mm-equivalent focal length of 16mm, making it ideally suited for indoor, architectural, and landscape subjects.|Fast f/2.8 maximum aperture benefits working in low-light conditions.|Manual focus design permits selective control over focus placement.|One extra-low dispersion element and two aspherical elements reduce chromatic aberrations and distortions in order to produce sharper images.|Nano Coating System improves light transmission and suppresses lens flare and ghosting for more contrast-rich, color-neutral images."