APS-C | f/1.4 to f/16 | 18mm (Full-Frame Equivalent) | Fast & Lightweight Wide-Angle Prime | Stepping Motor AF System | Rounded 9-Blade Diaphragm | Aperture Ring
APS-C | f/1.4 to f/16 | 19.2mm (Full-Frame Equivalent) | Fast & Lightweight Wide-Angle Prime | Stepping Motor AF System | Rounded 9-Blade Diaphragm | Control Ring
APS-C | f/1.4 to f/16 | 18mm (Full-Frame Equivalent) | Fast & Lightweight Wide-Angle Prime | Stepping Motor AF System | Rounded 9-Blade Diaphragm | Aperture Ring 3 Aspherical Elements, 2 SLD Elements