Vintage M-mount standard prime lens with a rigid barrel.
The Leitz Summicron 50mm f/2 (Rigid, v2) is the second-generation rigid-barrel Summicron — redesigned by Walter Mandler in 1956 to improve optical performance over the first rigid version. The 'Rigid' suffix distinguishes it from the earlier collapsible Summicron. Built at the Leitz factory in Wetzlar, it is one of the most collectible and optically significant vintage Leica lenses.
50mm focal length, f/2 maximum aperture, 6 elements in 4 groups, Leica M-mount, rangefinder coupled, 39mm filter thread (E39 screw or Series 5.5 drop-in), close focus approximately 1m.
The Summicron 50mm Rigid v2 has become one of the most sought-after vintage Leica lenses — the Mandler 1956 redesign is praised for its rendering balance: technically sharp but with a character absent from modern aspheric designs. The rigid barrel design ran from 1956 to 1968; the Dual-Range Summicron (DR) is a variant with a close-focus goggles accessory. Compare: Summicron 50mm v4 (1979) and v5 ASPH (1994) are later designs with different rendering characteristics.
Check rangefinder coupling accuracy at 1m, 2m, and infinity. Inspect all six elements for haze or internal separation — a known failure mode on Mandler-era glass. Test iris for oil on blades (very common on this generation). Inspect the rigid barrel for dents or helicoid damage from decades of use. Verify M-mount coupling and lens release button function.