Providing a classic normal-length field of view along with an impressive optical design, the Leica APO-Summicron-SL 50mm f/2 ASPH. is a bright prime lens designed for full-frame L-mount mirrorless cameras. The f/2 maximum aperture balances speed with overall weight and size, resulting in a portable form factor that can excel in available light conditions. Three aspherical elements are used to reduce spherical aberrations and distortion for high sharpness, and the lens also features an apochromatic optical design, which employs anomalous partial dispersion glass to suppress color fringing and chromatic aberrations for high clarity and color accuracy. Multi-layer coatings also help to limit flare and ghosting for increased contrast when working in strong lighting conditions. Complementing the optics is a Dual Syncro Drive stepping motor, which delivers fast and quiet autofocus performance to suit both stills and video applications. Additionally, an AquaDura coating has been applied to the exposed elements and seals have been incorporated in the lens design to benefit working in harsh environmental conditions.