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Catalogued as 11113 and 11114, the second 50mm Summilux was the fast standard lens of the M system for thirty years, 1961 to 1991, 43,505 lenses on Walter Mandler's seven element, five group design. The black anodised version weighs about 275 grams, light enough to disappear on the body, and takes E43 filters with a twelve blade diaphragm and one metre close focus. At full aperture it is soft and luminous; stopped down it is a straightforward, contrasty fifty.