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The fourth version of the 35mm Summicron ran from 1979 to 1999 and totalled 52,993 lenses, and it is the one collectors call the King of Bokeh. Walter Mandler's design uses seven elements in five groups with a ten-blade diaphragm, works from f/2 to f/16 and focuses to 0.7m, taking E39 filters in a barrel of about 26 by 52mm. In black anodised alloy it weighs roughly 160g. Backgrounds fall away smoothly while the plane of focus stays crisp.