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 and historically significant lenses in photography, produced across multiple generations from the 1950s to the present under the Leitz (later Leica) name. The Summicron designation indicates Leica's f/2 lens class. Various generations — First, Second, Third, Fourth, Fifth, and current — each represent distinct optical formulas.
The lens delivers 50mm at f/2 maximum aperture with Leica M bayonet coupling, 6-bit coding on later versions, rangefinder-coupled focusing, manual aperture, and full-frame 35mm coverage. Build quality is the highest precision manufacturing Leitz/Leica applies to any product.
The Summicron 50mm f/2 is arguably the most important lens in Leica's history — it has been the standard lens for Leica M cameras across seven decades. Each generation is well-documented in the Leica community, with specific rendering characteristics, coating types, and minimum focus distances associated with each design iteration. Condition and generation are primary determinants of value.
Identify the specific generation from physical markings, serial number, and construction details before evaluating. Inspect rangefinder coupling accuracy at close and infinity focus. Check 6-bit coding contacts if applicable. Examine element condition carefully — Leitz coating quality and era affect rendering. Aperture blades should operate cleanly.