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The name Summilux is used by Leica and Panasonic Lumix to designate camera lenses 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.
The name Summilux is a combination of Summum, which is the Latin word for highest, while Lux is for light. [1] 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. [2]
The Summilux lenses have a maximum f-number of f/1.4, f/1.5 or occasionally f/1.7. This means they are 1 to 1.5 f-stops slower than Leica's Noctilux lenses, but the Summilux lenses are smaller as a result. [1] Summilux lenses are designed for low-light photography.
The Summilux lenses are less expensive than the Noctilux lenses, which has a smaller f-number. [1] However they are bigger, heavier and more expensive than the Summicron.
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