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Leica Summilux-M 50 mm f/1.4 Version 2 (1961 – 1968)Leica Summilux 35 mm f/1.4 Version 1Optical Diagram of Leica Summilux-R 50mm f/1.4 II lens.
The name Summilux is used by Leica and PanasonicLumix to designate cameralenses that have a maximum aperture brighter than f/2, typically at f/1.4, but dimmer than f/1.0. The lens has been in production since 1959 and carries on to the present day.
History
The name Summilux is a combination of Summum, which is the Latin word for highest, while Lux is for light. The first Summilux was the 50 mm of 1959, followed by a new 50 mm Summilux design in 1961, whose optics remained unchanged until replaced by the 50 mm Summilux-M ASPH of 2004.
Description
The Summilux lenses have a maximum f-number of f/1.4, f/1.5 or occasionally f/1.7. This one to 1.5 stops lower than Leica's Noctilux lenses, but the Summilux lenses are smaller as a result. Summilux lenses are designed for low-light photography.
Market position
The Summilux lenses are less expensive than the Noctilux lenses, which has a smaller f-number. However they are bigger, heavier and more expensive than the Summicron.
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