Tokina ATXAF120DXN 11-20mm f/2.8 Pro DX Lens for Nikon F F-Mount Lens/DX Format. 16.5-30mm (35mm Equivalent) Aperture Range: f/2.8 to f/22. P-MO & Glass-Molded Aspherical Elements Three SD Ultra-Low Dispersion Elements. Multi-Layer Lens Coatings