Leitz Summicron 50mm f/2 — the classic Leica standard prime across generations of M-mount.
The Leitz Summicron 50mm f/2 is one of the most celebrated lenses in photography history — Leica's standard f/2 prime spanning multiple generations from the 1950s to present. The Summicron designation indicates Leica's f/2 speed tier. Multiple versions exist — rigid, collapsible, and various optical updates. Each generation is excellent for its era.
Optical performance varies by version — all are good to excellent. Early collapsible versions have vintage character. Later rigid versions (V4, V5) are sharper with better correction. The current ASPH version (ID 3450) is reference-class. All Summicrons deliver the Leica rendering — micro-contrast, tonal depth, and precise colour. The f/2 speed is Leica's standard tier.
Leica M mount. Filter thread varies by version — E39 (39mm) on most. Weight varies — collapsible versions are lighter. Build quality is outstanding across all generations. The Summicron 50mm is the single most important lens in Leica's history — the default standard prime for the M system since the 1950s.
Prices vary dramatically by version — early collapsible versions are cheaper, ASPH versions command premium. Check rangefinder coupling, smooth focus, and clean optics. Identify the specific version to assess value. The Summicron 50mm in any version is a genuine Leica classic. The definitive M-mount standard lens.