Sigma 10-20mm f/3.5 EX DC HSM ELD SLD Aspherical Super Wide Angle Lens for Nikon Digital SLR Cameras - Starter Kit Super-Wide: 10-20 with maximum aperture of F3.5 throughout entire zoom range Two ELD (Extraordinary Low Dispersion) glass elements and a SLD (Special Low Dispersion) glass elements and four aspherical lenses Kit Includes: Sigma 10-20MM EX DC Lens + 82mm Filter Kit + Cap Keeper + Lens cleaning kit + Cleaning Cloth