Leica's R-mount standard wide — Summicron 35mm f/2 with 3-cam mechanical coupling.
The Leica Summicron-R 35mm f/2 (3 Cam) is a standard-wide prime for the Leica R SLR system at Summicron (f/2) aperture class. The 3-Cam enables correct metering on Leica M bodies via M-Adapter-R alongside standard R body compatibility. Leica R mount.
f/2 maximum aperture. 35mm focal length (full-frame). 3-Cam coupling (Leicaflex SL, R3–R7, and Leica M via M-Adapter-R). Manual focus via SLR viewfinder. At approximately 335g. 55mm filter thread. Leica R mount.
The Summicron-R 35mm f/2 is more compact and less expensive than the Summilux-R 35mm f/1.4 while providing very high optical quality at f/2. 3-Cam enables M-body metering; for mirrorless adapted use cam type is irrelevant. A popular R lens for adapted mirrorless use.
On the used market the Leica Summicron-R 35mm f/2 (3 Cam) is a premium standard-wide prime. Condition checks: 55mm front element, three cam contacts for wear, aperture blade operation, focus ring smoothness. Leica R mount — requires adapter for current cameras.