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Lens coating was discovered by Alexander Smakula, a Carl Zeiss engineer, in the 1930’s. He was credited for developing it, and this completely changed the world of optics.
Pretty much every lens you’ve ever looked through has a lens coating. Be it a camera lens, a rifle scope, a binocular, and a spotting scope. All kinds of optics need to transmit light from one end to the other for the user to see where it is pointed at.
Optics like spotting scopes, use lenses, prisms, and mirrors to transmit light and images to the user. Without the coating, what you would deal with is…