SIGMA 24MM F/1.4 DG HSM ART LENS FOR CANON EF
EF Mount Lens/Full-Frame FormatAperture Range: f/1.4 to f/16FLD and Special Low Dispersion ElementsTwo Aspherical Glass ElementsSuper Multi-Layer CoatingHyper Sonic AF MotorFull-Time Manual Focus OverrideRounded 9-Blade DiaphragmThermally Stable Composite MaterialCompatible with Sigma USB Dock