APS-C | f/1.8 to f/16 Aperture | 25.5mm (Full-Frame Equivalent) | Fast & Lightweight Wide-Angle Prime | STM Autofocus Motor | 2 ED & 3 HR Lens Elements
APS-C | f/1.4 to f/16 | 22.5mm (Full-Frame Equivalent) | Compact, Fast Wide-Angle Prime | Stepping Motor AF System | Manual Aperture Ring | FLD, SLD, and Aspherical Elements
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
Full Frame | f/1.2 to f/16 | Fast Wide-Angle Prime Lens | HLA-Driven High-Speed AF Motor | Rounded 11-Blade Diaphragm | Aperture Ring, Focus Mode Switch | 4 Aspherical Elements, 1 SLD Element
Full-Frame | f/2.8 to f/22 | 2:1 Magnification, 6.7" Min. Focus | Manual Focus Design, Clicked Aperture | 9-Blade Diaphragm | Two ED Lenses, Two HR Lenses |All-Metal Construction