A little bit about Canon photo technique

    I was looking for articles about the mineral fluorite from which lenses are made.
    I got quite interesting PDFs on the official Canon website

    EF lens concept
    Achievements of Canon
    EF lenses with fixed focal lengths
    EF lenses zoom
    lenses EF lenses EF lenses EF-S
    lenses Accessories for EF lenses
    General information on interchangeable lenses
    Photo
    technology EF lens technology
    Optical terminology
    EF Lens Specifications

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