Product description: The Leica Summilux-SL 1:1.4/50 mm ASPH. is designed for maximum optical performance and achieves new benchmarks in sharpness. Thanks to its fast internal focusing, the length of the lens does not change when focusing.

The special feature of the design lies in the implementation of motor-driven focusing. Unlike manually focused prime lenses, which typically vary in length during focusing, the Leica Summilux-SL 1:1.4/50 mm ASPH. features internal focusing. For the sake of consistently high imaging quality across the entire focusing range, this group is meticulously designed with an aspherical lens, yet remains light enough to ensure fast autofocus. The optical design consists of a total of eleven lenses, including two aspherical lenses and four lenses made from glasses with anomalous partial dispersion to correct chromatic aberrations. This complex optical structure minimizes all monochromatic aberrations as well as color errors to an barely perceptible level. Elaborate coatings on all lens surfaces, optimal design of lens mounts, and the included rectangular lens hood significantly reduce reflections and stray light.