Long focus lenses have contributed considerably to the fame and universal importance of the Leica system. The Telyt 400mm f/5 was introduced in 1936 and captured the imagination of photographers by its ability to magnify the objects by a factor of 8, compared to the standard lens. You should understand that this ratio is related to the inherent magnification
of the 50mm lens, and so is different from the 8x magnification you get with a 8 times binocular system: as example the LEICA TRINOVID 8 x 42 BN. With this focal length, the Leica system could cover an unparalleled range of subjects and photographic tasks. This Telyt was a very slow seller, but the Leica system as a universal photographic tool was firmly established. It is an ingrained feature of human nature to try to push the limits of the system a notch farther. During the growth of the Leica system, the maximum focal length climbed from 400mm to 560mm and in 1978 to 800mm.