Sigma 40mm f/1.4 DG HSM Art Lens for Canon EF

– EF-Mount Lens/Full-Frame Format
– Aperture Range: f/1.4 to f/16
– Three FLD Elements, Three SLD Elements
– One Aspherical Element
– Super Multi-Layer Coating
– Hyper Sonic AF Motor, Manual Override
– Weather-Sealed, Protective Front Coating
– Rounded 9-Blade Diaphragm
– Compatible with Sigma USB Dock