In the past, wide aperture lenses ( f / 2, f / 2.8 ) were very expensive, due to their complex mathematical design and manufacturing know-how required, at a time when all computations and glass making were done by hand.
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For instance, the removable back was for faster loading and reloading, the bayonet lens mount was designed for rapid lens interchangeability, the long-base rangefinder was for more accurate focusing with large aperture lenses, and the vertical metal shutter not only gave a faster maximum speed but also banished the problem of shutter blinds burning.
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Very-large-aperture lenses designed to be useful in very low light conditions with apertures ranging from f / 1.2 to f / 0.9 are generally restricted to lenses of standard focal length because of the size and weight problems that would be encountered in telephoto lenses and the difficulty of building a very wide aperture wide angle lens with the refractive materials currently available.
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