Contemporary Series: This 56mm F1.4 DC DN contemporary lens provides the amount of bokeh and admirable brightness expected from F1.4 lenses even in the mid-tele range.. Compact Design: Retains the compact, lightweight, and outstanding image quality concepts of the Contemporary line, thanks to SIGMA's leading-edge technology. 84mm (35mm Equivalent). Lens Structure: This lens design is considered based on the capabilities of the camera body function to correct peripheral light amount and distortion. Moreover, axial color aberration, is efficiently corrected by incorporating an SLD glass element.. Dust and Splash Resistance: The mount features a special sealing* to make the lens an excellent choice in a wide variety of conditions.. Smooth Auto Focus: The combination of optical design for video AF and use of the stepping motor enables smooth and quiet autofocus.