The moon as seen through the EF 400mm f/5.6L USM with a teleconverter
The Canon EF 400mm are seven super-telephoto lenses made by Canon. These lenses have an EF mount that work with the EOS line of cameras. These lenses are widely used by sports and wildlife photographers.[1]
Canon has manufactured four 400mm prime lenses:
EF 400mm f/2.8L IS III USM
EF 400mm f/2.8L IS II USM[2]
EF 400mm f/4 DO IS II USM
EF 400mm f/5.6L USM
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.[4][5]
These lenses are compatible with the Canon Extender EF teleconverters.
^the-digital-picture.com
^usa.canon.com
^"Canon U.S.A. Celebrates 75 Years Of Optics Heritage With The Addition Of Three New Lenses" (Press release). Canon U.S.A. September 15, 2014. Retrieved September 15, 2014.
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