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2. Canon EF 400mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_400mm_lens

   The 400mm f / 4 DO IS II USM, which replaced an earlier version of the same lens in 2014, [3] is one of only two Canon lenses that make use of diffractive optics (the other is the EF 70–300mm f/4.5–5.6 DO IS USM). The use of diffractive optics allows the lens to be significantly lighter than it might otherwise be.

3. Magic Lantern (firmware) - Wikipedia

   en.wikipedia.org/wiki/Magic_Lantern_(firmware)

   Magic Lantern is a firmware add-on for various Canon digital single-lens reflex (DSLR) cameras and the EOS M. [2] It adds features for DSLR filmmaking and still photography, and is free and open-source. Magic Lantern was originally written for the Canon EOS 5D Mark II [3] by Trammell Hudson in 2009 after he reverse engineered its firmware. [1]

4. ISO/IEC 38500 - Wikipedia

   en.wikipedia.org/wiki/ISO/IEC_38500

   ISO/IEC 38500 is an international standard for Corporate governance of information technology published jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).