The Leica Summarit-S 70mm f/2.5 ASPH CS Lens is a high performance, standard focal length optic built exclusively for the Leica S Digital Camera System. Designed for professional applications, the lens guarantees outstanding color and contrast at all apertures and distances as close as 1.6' (0.5m). Highly refractive glass with anomalous partial dispersion provides image sharpness from edge to edge and a built-in front filter with environmental sealing protects the optic under harsh shooting conditions. An integrated focal plane shutter provides action-stopping flash sync up to 1/500th of a second. Powerful Depth-of-Field Control With a large f/2.5 maximum aperture, the lens provides outstanding low light performance and fine depth-of-field control. The circular shaped aperture offers beautiful out of focus characteristics for dramatic portraits with soft bokeh. Dedicated Autofocus Motor Leica S Series Lenses are manufactured with autofocus built into the lens. An integrated screw-type motor provides dependable, fast autofocusing without noise. The photographer can override autofocus at any time by adjusting the wide focus ring. Central Shutter Technology Employing a new Central Shutter system, the lens can reach an action-stopping flash sync of up to 1/500th of a second.