F-Mount Lens/FX Format Aperture Range: f/1.8 to f/16 One Aspherical Element Super Integrated Coating Silent Wave Motor AF System Rounded 7-Blade Diaphragm    

EF-S-Mount Lens/APS-C Format 16-28.8mm (35mm Equivalent) Aperture Range: f/4.5 to f/29 One UD Element & One Aspherical Element Super Spectra Coating STM Stepping AF Motor Optical Image Stabilizer Rounded 7-Blade Diaphragm

EF-Mount Lens/Full-Frame Format Aperture Range: f/1.8 to f/22 Super Spectra Coating Ring-Type Ultrasonic Motor AF System Rounded 8-Blade Diaphragm

Key Feature.   50mm normal prime lens Fast –  and maximum f/1.4 aperture Quiet and fast USM focusing motor The ultimate mix of versatility and image quality For Canon EOS crop- and full frame DSLR’s Camera’s

Key Features EF-Mount Lens/Full-Frame Format Aperture Range: f/2.8 to f/22 Three Aspherical and Two UD Elements SWC, Air Sphere, and Fluorine Coatings Ring-Type Ultrasonic Motor AF System Weather-Sealed Construction Rounded 9-Blade Diaphragm