Summicron Summicron is used by Leica to designate camera lenses that have a maximum aperture of f/2 after 1953 and to present day .History The name Summicron is derived from the 50 mm Summar, a lens introduced in 1933 and Krone , the German word for crown. In the 1950s Leica bought Crown glass from an English company and used it to make the lenses .World War II allowed for the creation of the Summicron lens. The first Summicron was an evolved Summitar collapsible 50mm with Lanthanum glass, and was launched in 1953. Generations before approximately 1960 were produced in M39 mount, then made available in M-mount, R-mount, and C-mount.Description The Summicron lenses have a maximum f-number of f/2.Faster Leica lenses are offered with the trade names Noctilux and Summilux . Summarit, Elmarit , and Elmar lenses are slower.List of Summicron lenses Summicron 50 mm collapsible Summicron 50 mm f/2 rigid Leica M mount: Summicron-M 28 mm ASPH. Summicron-M 35 mm Summicron-M 35 mm ASPH. Summicron-C 40 mm Summicron-M 50 mm Apo-Summicron-M 50 mm ASPH. Apo-Summicron-M 75 mm ASPH. Apo-Summicron-M 90 mm ASPH. Leica R mount: Leica 35 mm Summicron-R 1st version – 1970 Leica 35 mm Summicron-R 2nd version – 1976 Leica 50 mm Summicron-R 1st version – 1964 Leica 50 mm Summicron-R 2nd version – 1977 Leica 90 mm Summicron-R 1st version – 1969 Leica 90 mm Summicron-R 2nd version – Leica 90 mm APO-Summicron-R ASPH – 2002 Leica 180 mm APO-Summicron-R Leica S mount: Summicron-S 1:2/100 mm ASPH. APO-Summicron-SL 1:2 / 21 ASPH. APO-Summicron-SL 1:2 / 24 ASPH. APO-Summicron-SL 1:2 / 28 ASPH. APO-Summicron-SL 1:2 / 35 ASPH. APO-Summicron-SL 1:2 / 50 ASPH. APO-Summicron-SL 1:2 / 75 ASPH. APO-Summicron-SL 1:2 / 90 ASPH. Leica L Mount Cine lens: 15 mm T/2.0 18 mm T/2.0 21 mm T/2.0 25 mm T/2.0 29 mm T/2.0 35 mm T/2.0 40 mm T/2.0 50 mm T/2.0 75 mm T/2.0 90 mm T/2.0 100 mm T/2.0 135 mm T/2.0
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