Leica's APO-corrected M-mount 75mm — Summicron f/2 with apochromatic precision for M rangefinders.
The Leica APO-Summicron-M 75mm f/2 ASPH. is a premium portrait prime for Leica M-mount cameras, combining apochromatic (APO) correction with an aspherical element (ASPH.) for high optical performance. Among the more highly regarded portrait primes in the Leica M system. Leica M mount.
f/2 maximum aperture. 75mm focal length. APO (apochromatic) correction. ASPH. (aspherical element). Leica M mount. Manual focus with rangefinder coupling. At approximately 400g. E49 filter thread.
The APO designation indicates correction of chromatic aberration across three wavelengths (versus two in standard chromatically corrected designs), reducing the residual colour fringing visible in high-contrast transitions. The 75mm focal length provides a flatter perspective than a 50mm Summicron for portrait work while remaining within a comfortable working distance for rangefinder portrait photography. The APO-Summicron-M 75mm is considered one of the highest-performing Leica M-mount lenses.
On the used market the Leica APO-Summicron-M 75mm f/2 ASPH. commands a premium price even secondhand due to its optical reputation and Leica M collectibility. Condition checks: rangefinder coupling cam for wear, front element and APO coatings for marks, focus ring smoothness, aperture blade condition. Manual focus with Leica M rangefinder coupling.