The Summilux-M 21mm f/1.4 ASPH. from Leica is a remarkably wide and rapid lens, characterized by its versatility as an M-mount prime that produces outstanding image quality. Its super wide-angle focal length is enhanced by the inclusion of five anomalous partial dispersion elements and two aspherical elements, which effectively mitigate chromatic and spherical aberrations, resulting in exceptional sharpness and clarity, along with well-managed vignetting and distortion. Additionally, the optical design features a floating elements system that ensures consistent image quality across the entire focusing range. Super wide-angle prime features a bright, fast f/1.4 maximum aperture to benefit working in low-light conditions and for greater control over depth of field. Five anomalous partial dispersion elements reduce color fringing and chromatic aberrations for increased clarity as well as consistent, even illumination and well-corrected vignetting. Two aspherical elements suppress spherical aberrations and distortion for improved sharpness. Floating elements system achieves consistent image quality throughout the focusing range, even at the minimum focusing distance of 2.3'. The front of the lens is male threaded to accept the included lens hood and the hood is designed to accept Series 8 filters.
