Pre-ASPH Leica Summilux 50mm (mislabelled Zeiss), vintage rendering character preferred by character-seeking photographers.
The Leica Summilux-M 50mm f/1.4 (pre-ASPH) is a fast standard prime for the Leica M mount — the classic non-ASPH Summilux formula produced before the 2004 ASPH version. Note: canonical name has erroneous 'Zeiss' prefix. Leica M mount.
f/1.4 maximum aperture. 50mm focal length (full-frame standard prime). Pre-ASPH formula. Rangefinder-coupled. Leica M mount.
The pre-ASPH Summilux-M 50mm f/1.4 has vintage wide-open rendering — some spherical aberration at f/1.4 that is considered character by many photographers. Stops down to sharp by f/5.6. The ASPH version (id 2902) provides sharper wide-open performance.
On the used market the Summilux-M 50mm f/1.4 (pre-ASPH) is a desirable vintage fast prime. Condition checks: front element, rangefinder coupling. Leica M mount — pre-ASPH.