Canon EF 400mm lens
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.
Canon currently manufactures four 400mm prime lenses:
- EF 400mm f/2.8L IS III USM
- EF 400mm f/2.8L IS II USM
- 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, is one of only two Canon lenses that make use of diffractive optics (the other is the Canon EF 70-300mm lens). The use of diffractive optics allows the lens to be significantly lighter than it might otherwise be.
These lenses are compatible with the Canon Extender EF teleconverters.
Specifications of the EF 400mm lenses
|Attribute||f/2.8L USM||f/2.8L II USM||f/2.8L IS USM||f/2.8L IS II USM||f/2.8L IS III USM||f/4 DO IS USM||f/4 DO IS II USM||f/5.6L USM|
|Construction||9 groups / 11 elements||13 groups / 17 elements||12 groups / 18 elements||6 groups / 7 elements|
|# of diaphragm blades||8||9||8||9||8|
|Closest focusing distance||4 meters||3 m||2.7 m||2.5 m||3.5 m||3.3 m / 10.83 ft||3.5 m|
|Horizontal viewing angle||5°10'|
|Vertical viewing angle||3°30'|
|Diagonal viewing angle||6°10'|
|Weight||13.44 lb / 6.1 kg||13.03 lb / 5.91 kg||11.83 lb / 5.37 kg||8.48 lb / 3.85 kg||2.840 kilograms (6.26 lb)||4.27 lb / 1.94 kg||4.63 lb / 2.10 kg||2.8 lb / 1.25 kg|
|Maximum diameter||6.57" / 167mm||6.41" / 163mm||5.03" / 128mm||5.04" / 128mm||3.54" / 90mm|
|Length||13.70" / 348mm||13.74" / 349mm||13.50" / 343mm||9.16" / 232.7mm||9.18" / 232.7mm||10.09" / 256.5mm|
|Filter diameter||48mm||52mm drop-in filter||77mm|
|Lens hood||ET-161B II||ET-155||ET-155 (WII)||ET-120||ET-120 (WII)||Built-in|
|Release date||April 1991||March 1996||September 1999||August 2011||December 2018||December 2001||September 2014||May 1993|
|Currently in production?||No||Yes||Yes||No||Yes|
|MSRP $||870,000 yen||980,000 yen||$7,999||$9,999||$11,999||$6,469||$6,899||$1,249|
Use in astronomy
Canon 400 mm f/2.8 L IS II USM lenses are used in the Dragonfly Telephoto Array. The array is designed to image objects with low surface brightness such as some satellite galaxies. The telescope Array started with three lenses but this has since increased to 24 with plans for 50.
- "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.
- Abraham, Roberto G; van Dokkum, Pieter G (2014). "Ultra–Low Surface Brightness Imaging with the Dragonfly Telephoto Array". Publications of the Astronomical Society of the Pacific. 126 (55). arXiv:1401.5473. Bibcode:2014PASP..126...55A. doi:10.1086/674875. Retrieved 4 May 2017.
- Barss, Patchen (28 January 2016). "How to Discover a Galaxy with a Telephoto Lens". Nautilus. NautilusThink Inc. Retrieved 4 May 2017.
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