Leica's vintage R-mount fifty — the Summicron-R 50mm f/2 Type I with outstanding optics.
The Leica Summicron-R 50mm f/2 I (catalog code 11228) is the first version (Roman numeral I) of the Summicron-R standard prime for the Leica R SLR system. The 11228 catalog code confirms this specific variant. Leica R lenses used a multi-cam system with 1-cam, 2-cam, and 3-cam versions determining body generation compatibility.
The lens delivers 50mm at f/2 maximum aperture in the first-version Summicron-R optical formula, Leica R bayonet in either 1-cam, 2-cam, or 3-cam configuration (confirm from physical inspection), manual focus, and full-frame coverage.
The Summicron-R 50mm f/2 I represents the original Summicron-R optical formula before the later improvements in the second version. The cam count is critical for body compatibility — 1-cam works only with early Leicaflex; 3-cam works with all R bodies from Leicaflex SL through R9. Leica R lenses are popular for adaptation to modern mirrorless cameras.
Identify the cam count from the bayonet — count the metallic follower tabs. Verify 11228 catalog code from physical lens markings. Test aperture blade operation at f/2. Inspect element condition and coating. Leica R adapters for Sony FE and other mounts are widely available.