SIGMA 10-20mm f/3.5 EX DC HSM SLR Lenses Lens for NIKON Black Type: Wide Angle Lens Focal Length: 20 mm Camera Mount: Nikon F Aperture: Maximum: f/3.5 Minimum: f/16 Compatibility: Nikon Diameter: 82 mm Focus Type: Auto Focus Filter thread (Diameter): 82 mm