Standard zoom is designed for FX-format F-mount cameras, however can also be used with DX models where it provides a 36-180mm equivalent focal length range.. Constant f/4 maximum aperture offers consistent performance throughout the zoom range.. Three aspherical elements are used to reduce spherical aberrations and distortion in order to realize sharp imagery with accurate rendering.. Two extra-low dispersion elements greatly reduce color fringing and chromatic aberrations in order to produce greater clarity and color accuracy.. Both a Nano Crystal Coat and a Super Integrated Coating have been applied to individual elements to suppress internal reflections, flare, and ghosting for improved contrast and color accuracy when working in strong lighting conditions.