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Leica's APO-Summicron-M 90mm f/2 ASPH is the apochromatic successor to the Mandler 90mm Summicron, five elements in five groups with an aspherical surface, an E55 filter thread and one metre close focus. This is the titanium finished version, order code 11632, made to partner the titanium M bodies. Leica's batch records show it in two 2001 runs of 550 and 70 lenses, so around 620 against total 90 APO production of a little over 14,800. It is the scarcest of the four finishes.