Stepping motor delivers excellent autofocus with quiet performance.The optical design and stepping motor deliver smooth autofocus during video shooting. The lens design fully accommodates the Fast Hybrid AF of Sony E-mount cameras for super-fast autofocus functionality. Using face recognition AF results in consistent autofocusing on faces. even as the subjects move.Combines compactness with outstanding optical performanceThe SIGMA 16mm F1.4 DC DN | Contemporary features SIGMA's inner focus technologies. while lighter lens elements in the focus lens group make possible a more compact actuator. Moreover. this lens offers outstanding stability whether the photographer is shooting handheld or has the camera placed on a surface. Structurally. the lens features materials and parts that contribute to its compact. lightweight structure. In summary. this is an unprecedented lens that combines outstanding optical performance with exceptional portability and usability.Large lens hood (supplied) t