While retaining the compact, lightweight, and outstanding image quality concepts of the Contemporary line, thanks to SIGMAs leading-edge technology, this lens provides the amount of bokeh and admirable brightness expected from F1.4 lenses even in the mid-tele range. This addition completes the large aperture series comprised of portable wide-angle, standard, and telephoto lenses. Smooth AF ideal for video shooting The combination of optical design for video AF and use of the stepping motor enables smooth and quiet autofocus. This Sigma 56mm f/1.4 DC DN C Lens is also compatible with the Sony E-mount Fast Hybrid AF, achieving precise AF tracking. By using the face recognition or eye AF functions of cameras, focus will continuously be on the face or the eye even if the subject moves during the shoot. Mount with dust- and splash-proof construction The mount features a special sealing to make the lens an excellent choice in a wide variety of conditions. High-precision, rugged brass bayonet