Sigma 50-100mm f/1.8 DC HSM Art Lens for Nikon F 15PC Accessory Kit. Includes 3PC Filter Kit (UV-CPL-FLD) + 6 Piece Graduated Filter Set (Red, Yellow, Blue, Orange, Grey, Purple) + More Nikon F Mount/DX Format; 75-150mm (35mm Equivalent) Aperture Range: f/1.8 to f/16; One SLD and Three FLD Elements One High-Refractive Index Element; Super Multi-Layer Coating Hyper Sonic AF Motor; Internal Zoom and Focus; MF Override Fluorine-Coated Polycarbonate Diaphragm; Tripod Collar