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.