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The Flak 38 was accepted as the standard Army gun in 1939, and by the Kriegsmarine as the C/38. In order to provide airborne and mountain troops with an AA capability, Mauser was contracted to produce a lighter version of the Flak 38, which they introduced as the 2 cm Gebirgsflak 38 ( 2 cm GebFlak 38 ).
Leica 50 mm f /2.0 Summicron-R 2nd version – 1977 (built-in lens hood, 3-cam and R-cam only version) Leica 50 mm f /1.4 Summilux-R 1st version; Leica 50 mm f /1.4 Summilux-R 2nd version; Leica 50 mm f /1.4 Summilux-R 3rd version – 1997 (ROM contacts) Leica 60 mm Macro-Elmarit-R 1st version – 1972 – outside bayonet lens hood fitting
Leica M lenses. 7) Elmarit 21 mm/2.8 (first retrofocus 21 mm design, in catalogue from 1980 to 1997. This lens replaced the Super-Angulon 21 mm/3.4 in production from 1963). 8) Elmarit-M 28 mm/2.8 (3rd) (excellent retrofocus lens for M rangefinder cameras, in production from 1979 until 1993) 9) Summaron 35 mm/2.8 (with and without goggles)
The 550 mm lens is a 6/2 construction, giving 78° of coverage, while the 1100 mm lens is 4/4 with 45.7° of coverage. Both lenses are mounted in a Copal 3 shutter, and the longer lens is also available in a barrel mount with Waterhouse stops, if the faster f/14 version is desired. 550mm f/11; 770mm f/14.5; 1100mm f/22(14)
The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]
A "slow" lens (one that is not capable of passing a lot of light through) might have a maximum aperture from 5.6 to 11, while a "fast" lens (one that can pass more light through) might have a maximum aperture from 1 to 4. Fast lenses are, by definition, larger than slow lenses (for comparable focal length), and typically cost more. [2]