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Introduced in 2008 and still catalogued, the Summilux-M 21mm f/1.4 ASPH gives the M system a super-wide that opens as far as the fastest fifty. Order number 11647 covers the black anodised version. Its ten elements in eight groups include aspherical surfaces, minimum focus is 0.7 metres and the lens weighs about 580 grams. Filters are Series VIII discs held in the hood instead of a front thread, and the six-bit code drives corrections on digital M bodies.