Summicron
Summicron ( "extreme time" from the Latin summus "extremely" and the ancient Greek Kronos 'time') is the name of a number of different photo - lenses the company Leica Camera AG or formerly Ernst Leitz Wetzlar for the 35mm format with large opening widths that allow correspondingly short exposure times .
Historically, it was the successor to the Summitar presented in 1936 , which in turn had replaced the 1933 Summar . All three lenses shared the light intensity (2.0), focal length (50 mm) and the angle of view (45 °). The minimum aperture is f / 16, the near limit 70 centimeters. The lenses are available in black or chrome.
In 1950, for the first time, the factory gave several prototypes of the new lens under the name “Summitar” to a few selected photographers for testing. They went into production largely unchanged; the Summicron was available for purchase for the first time in 1953. The qualitative leap compared to its predecessors was mainly due to the use of lanthanum crown glass, which was new at the time (LaK9). Originally it was seven lenses, in 1969 it was reduced to six lenses.
As early as 1958 the Leitzwerke brought another lens onto the market under the name "Summicron" with a 35 mm lens, since then the name Summicron has been the term for lenses with an initial f-number of 2.0. The range has since been expanded. Since Summicron lenses were offered for the camera system M ( rangefinder ), S and T as well as for the now discontinued R series ( single lens reflex ), different focal lengths are sometimes available for these. For the M series there are Summicron types with focal lengths 28, 35, 50, 75 and 90 mm, for the S series a focal length 100 mm and for the T series a focal length 23 mm. The focal lengths 35, 50, 90 and 180 mm exist for the R series discontinued in 2009. All are interchangeable lenses and fixed focal lengths , under the name Vario-Summicron, fixed zoom lenses are used in various digital compact cameras ( Digilux 1 , Digilux 2 , Leica C ). The objectives that are apochromatically corrected contain the prefix "APO-" in the product name.
Lenses from the Leica brand with even higher speeds are sold under the names Noctilux , Nocticron and Summilux . Leica lenses with an open aperture f / 2.8 are called Elmarit .
proof
- ↑ a b H.-M. Brandt (1956) The Photo Lens. Structure and mode of operation of the most important brand lenses in world production. Friedr. Viehweg & Sohn, Braunschweig. P. 76
- ↑ H.-M. Brandt (1956) The Photo Lens. Structure and mode of operation of the most important brand lenses in world production. Friedr. Viehweg & Sohn, Braunschweig. P. 151
- ↑ a b c Jonathan Eastland: Leica M Compendium: Handbook of the Leica-M System , 1994, ISBN 1897802056 , pp. 58-59
- ^ Jonathan Eastland: Leica M Compendium: Handbook of the Leica-M System , 1994, ISBN 1897802056 , p. 51