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The eight-element 35mm Summicron is Walter Mandler's original f/2 wide angle for the M, eight elements in six groups, made from 1958 until 1969 and still the most closely followed of the four pre-aspherical versions. This is the Canadian variant, built by Ernst Leitz Canada at Midland rather than at Wetzlar, sharing the same formula, E39 filter thread and barrel of about 150 grams. Wide open it holds the plane of focus crisply while backgrounds soften rather than break up.