Leica's ultimate 90mm — the APO-Summicron-M in rare Titanium finish, apochromatic perfection.
The Leica APO-Summicron-M 90mm f/2 ASPH. in Titanium finish is one of the most prestigious lenses Leica has ever produced. The APO designation indicates full apochromatic correction — no chromatic aberration at any aperture. The ASPH aspherical element eliminates remaining aberrations. The Titanium finish is a rare, limited production variant that commands extreme collector premiums.
Optical performance is reference-class — this is considered one of the finest 90mm lenses ever made regardless of format or manufacturer. Sharpness is outstanding from f/2 with virtually zero chromatic aberration. The APO correction eliminates colour fringing at all distances and apertures. Rendering is three-dimensional with exquisite micro-contrast and tonal gradation.
Leica M mount with rangefinder coupling. Non-coded version — may need manual lens identification on digital M bodies. The Titanium finish provides a distinctive appearance and slightly different surface hardness. Filter thread is E55. Weight is approximately 500 grams. Build quality is the finest Leica engineering — precision machined to extraordinary tolerances.
Extremely rare and expensive on the used market — the Titanium finish adds substantial collector premium beyond the already expensive standard version. Check rangefinder coupling accuracy and smooth focus. Verify authenticity as counterfeits of rare Leica variants exist. A true Leica collector's piece that also happens to be an optically perfect lens.