Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens for NIKON SLR CamerasShort Description Nikon F Mount FX Format Aperture Range: f 2. 8 to f 22 180 Angle of View Diagonal, Distorted Image Seven Blade Diaphragm In The Box Sigma 15mm f 2. 8 EX DG Diagonal Fisheye Lens for Nikon F LCF 72 III 72mm Lens Cap Cap Adapter for Sigma 8 16mm & 15mm f 2. 8 Rear Cap LCR II for Nikon F Mount Lenses Carrying Case Limited 1 Year Seller Warranty Long Description Producing an expansive 180 angle of view, the Nikon F mount 15mm f 2. 8 EX