01 Dec 2019 — To extend ideal performance to an ever-wider range of camera lenses, Canon embarked on the development of an optical glass with characteristics similar to fluorite.
01 Dec 2019 — With aspherical lenses, the visible world is revealed in sharpened detail, as if a veil had been removed.
01 Dec 2019 — The 3rd Generation DO Lens：Gapless dual-layered diffractive optical elements In September 2014, Canon announced the EF 400mm f/4 DO IS II USM compact super telephoto lens that incorporates the newly developed gapless dual-layered diffractive optical element. The gapless dual-layered diffractive optical element aims to improve the diffraction flare issue found in existing DO lens, bringing very high image quality while also being compact and lightweight. This lens is optimal for situations where it will be carried for lengthy periods such as mountain climbing, or nature photography. In July 2020, Canon announced another two edge cutting lightweight super telephoto RF lenses that also adopted the latest DO lens technology, namely the RF 600mm f/11 IS STM and RF 800mm f/11 IS STM.