Leica's APO-corrected R-mount 90mm — Summicron f/2 ASPH ROM, the finest R telephoto prime.
The Leica APO-Summicron-R 90mm f/2 ASPH. ROM is widely regarded as one of Leica's finest R-mount lenses — an apochromatic (APO) portrait telephoto with ASPH. aspherical element correction. ROM = electronic coding for R8/R9 bodies. Leica R mount.
f/2 maximum aperture. 90mm focal length (full-frame). APO (apochromatic) + ASPH. aspherical correction. ROM electronic coupling (R8/R9 compatible). Manual focus. At approximately 600g. 67mm filter thread. Leica R mount.
APO correction eliminates secondary chromatic aberration (residual colour fringing after primary correction), yielding extremely high resolution and micro-contrast. Combined with ASPH. field flattening, this lens is considered one of the highest-resolving 90mm lenses ever produced. Highly sought for adapted use on Sony FE and L-Mount cameras.
On the used market the Leica APO-Summicron-R 90mm f/2 ASPH. ROM is a premium portrait prime. Condition checks: 67mm front element, ROM contacts, aperture blade condition, focus ring smoothness. Leica R mount — requires adapter; very popular for adapted Sony FE and L-Mount use.