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The world's first interchangeable lens📷 with fluorite lenses is 50 years old

The world's first interchangeable lens with lenses made of fluorite Canon FL-F300mm f/5.6 has turned 50 years old — it was first put on sale in 1969. Synthetic fluorite is used not only in Canon camera lenses, but also in other company products, including lenses for broadcast cameras and telescopes.
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Lenses made of fluorite - crystals of calcium fluoride (CaF2) - in combination with lenses made of optical glass help to almost completely eliminate chromatic aberrations. However, natural fluorite crystals are too small to be used in photo lenses. Canon was the first company to use the special properties of fluorite when creating a lens with which you can get bright images with accurate color reproduction. In August 1966, the Canon F Plan program was launched, aimed at developing a high-quality lens with optical elements made of fluorite.
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Despite this, in an effort to develop a high-quality lens, Canon specialists successfully synthesized the first fluorite crystals in an electric furnace in March 1967, and in February 1968, the technology of mass production of synthetic fluorite crystals was introduced. At that time, fluorite could not be polished like ordinary optical glass. Therefore, Canon developed an alternative machining technology for polishing brittle material, which, however, took four times longer than the usual one. In May 1969, the first interchangeable Canon lens with lenses made of synthetic fluorite, FL-F300mm f/5.6, was released. Since then, elements made of this material have become an integral part of high-quality Canon lenses.
Оптическ
Optical elements made of fluorite significantly improve the characteristics of super-telephoto lenses, which are highly affected by the secondary spectrum due to their large focal length.
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And what kind of camera do you use?
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