Leica's fastest R-mount 35mm — Summilux f/1.4 ROM for professional R-system use.
The Leica Summilux-R 35mm f/1.4 ROM is a fast standard-wide prime for the Leica R SLR system at Summilux (f/1.4) aperture class. ROM indicates electronic coding for Leica R8 and R9 bodies. Leica R mount.
f/1.4 maximum aperture. 35mm focal length (full-frame). ROM electronic coupling (R8/R9 compatible). Manual focus via SLR viewfinder. At approximately 570g. 55mm filter thread. Leica R mount.
The Summilux-R 35mm f/1.4 is the fastest 35mm R-mount prime from Leica, providing the widest aperture and most selective depth of field at this focal length. R lenses of this optical class are used on modern mirrorless cameras via adapters for their rendering characteristics. ROM provides electronic data to R8/R9; irrelevant for adapted mirrorless use.
On the used market the Leica Summilux-R 35mm f/1.4 ROM is a premium fast wide-to-standard prime. Condition checks: 55mm front element, ROM contacts, aperture blade condition, focus ring smoothness. Leica R mount — requires adapter for current cameras; popular for adapted Sony FE and L-Mount use.