The Sigma 105mm f1.4 DG HSM Art Lens enables you to make optimum use of your Sony E-mount mirrorless camera. Ideal for photo and video captures the lens has 17 elements arranged in 12 groups. Three FLD and two SLD elements as well as a single aspherical element are also a part of the lens construction to maintain clarity and color neutrality. The Super Multi-Layer Coating controls ghosting and flare to ensure high saturation. With the Hyper Sonic Motor and updated AF algorithm the lens performs quietly. The electromagnetic aperture mechanism contributes to exposure adjustment by delivering stability at fast continuous shooting rates. Moreover the rounded 9-blade diaphragm creates pleasant a bokeh effect. This Sigma lens comes with a brass mount and rubber sealing to facilitate working in harsh weather. You can use an optional Sigma USB Dock with the lens to adjust its focus settings or update the firmware.