Tokina ATXAF247FXN 24-70mm f/2.8 Pro FX Lens for Nikon F F Mount Lens/FX Format. Aperture Range: f/2.8 to f/22 Three Glass Molded Aspherical Elements. Three SD Super-Low Dispersion Elements Multi-Layer Lens Coatings. Silent-Drive Module AF System Internal Focus; One-Touch Focus Clutch Nine-Blade Diaphragm