Leica's flagship 50mm — the Summilux ASPH delivers legendary rendering with modern aspherical correction.
The Leica Summilux-M 50mm f/1.4 ASPH. is the reference 50mm normal prime for the Leica M rangefinder system, combining f/1.4 maximum aperture with an aspherical element for wide-open correction on the full-frame M sensor. At 337g and 46mm filter thread it is compact for an f/1.4 full-frame prime. Current production (post-2022) features 11 aperture blades for more rounded bokeh; earlier production (pre-2022) used 9 blades with the same optical formula. Focus is manual via rangefinder coupling.
The optical design uses 8 elements in 5 groups, including one aspherical element. Current production: 11 aperture blades (earlier production: 9 blades). The 46mm (E46) filter thread is a Leica standard. At 337g the lens is compact for an f/1.4 full-frame prime. Minimum focus distance of 0.45m. Focus is fully manual via M-mount rangefinder coupling — accurate focus at f/1.4 requires the M body's rangefinder to be properly calibrated and aligned.
The Summilux 50mm f/1.4 ASPH. is the reference fast normal prime for M-mount rangefinder photography: at f/1.4 on full-frame, background separation and available-light performance are at the practical maximum for a 50mm prime. The rangefinder focusing workflow — aligning the rangefinder patch rather than focusing a screen image — is inherently precise at any aperture when the camera is properly calibrated. The 0.45m MFD enables environmental portraiture with meaningful background separation.
On the used market the Summilux-M 50mm f/1.4 ASPH. commands a premium consistent with Leica M optics. Condition checks: rangefinder coupling accuracy at several focus distances — confirm the rangefinder patch aligns with the focus ring at both 0.7m and 3m — aperture blade operation from f/1.4 to f/16, and front element (E46) for marks. Confirm blade count to determine pre- or post-2022 production version. Compatible with all Leica M-mount bodies including M10, M11, and earlier digital M series.