SIGMA 12-24MM F/4 DG HSM ART LENS FOR CANON EF
EF-Mount Lens/Full-Frame FormatAperture Range: f/4 to 22FLD and Aspherical ElementsSuper Multi-Layer CoatingHyper Sonic AF Motor, Manual OverrideRounded 9-Blade DiaphragmTSC Material, Brass Bayonet MountDust- and Splash-Proof ConstructionCompatible with Sigma USB Dock