Leica's benchmark 90mm with APO correction and aspherical element, widely considered the finest 90mm lens ever produced.
The Leica APO-Summicron-M 90mm f/2 ASPH. is a compact telephoto lens for the Leica M rangefinder system that represents the state of the art in manual focus optics. The APO designation indicates apochromatic correction that eliminates virtually all chromatic aberration, while the aspherical element provides outstanding sharpness across the entire frame.
Optically, this lens is considered one of the finest 90mm lenses ever produced at any price, delivering extraordinary resolution and contrast from f/2 through to its minimum aperture. The rendering combines clinical sharpness in the focus plane with smooth, three-dimensional transitions to the out-of-focus areas that define the Leica look.
Build quality is Leica's finest — machined from brass and aluminium with anodised black or silver finish, precision-assembled in Wetzlar, Germany. The focusing helicoid operates with silky precision essential for the critical focus demands of f/2 on a rangefinder. The compact dimensions belie the lens's extraordinary optical capability.
The APO-Summicron-M 90mm f/2 ASPH. commands extraordinary prices on the used market, sought by Leica M shooters who demand the absolute best optical performance for portraiture and street photography at telephoto distances. It is widely considered the benchmark against which all other 90mm lenses are measured.