Alongside the anticipated M-Monochrom, Leica Camera AG has announced the Leica APO-Summicron-M 50 mm f/2 ASPH. The new lens features apochromatically corrected glass for reduced chromatism, aspherical lens surfaces and a floating element design (for close range correction of SA). The lens is expected to be available from the end of July at a retail price of £5,400 inc VAT. Note, the current non-apo 50mm f/2 version has the reputation of being the best 50mm optically and retails at just (!) $2,295 / £1,535 inc VAT, so this is without doubt a lens for the purist.
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Although it's easier to design 50mm's, this lens' performance looks like it will be superb wide-open right out to the corners of the frame.
Nothing short of outstanding performance at f/5.6.