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Leica's aspherical Elmarit-M 21mm f/2.8 arrived in 1997 and ran until 2010, nine elements in seven groups with an aspherical surface, correcting distortion and edge definition far beyond what the pre-aspherical 21mm could manage at full aperture. This is the black finish, order number 11135, anodised aluminium at roughly 300g where the chrome-plated brass version weighs 415g, and it takes E55 filters in an internal thread. It stays compact for its angle of view and remains one of the sharpest M wides.