Fisheye prime is designed for DX-format Nikon F-mount cameras and provides a 15.75mm equivalent focal length.. Bright f/2.8 maximum aperture is suitable for photographing in difficult lighting conditions.. One aspherical element is used to reduce spherical aberrations and distortion in order to realize sharp imagery with accurate rendering.. One extra-low dispersion element greatly reduces color fringing and chromatic aberrations in order to produce greater clarity and color accuracy.. Super Integrated Coating has been applied to individual elements to suppress internal reflections, flare, and ghosting for improved contrast and color accuracy when working in strong lighting conditions.