Canon EF 400mm f/4 DO IS USM

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Canon EF 400mm f/4 DO IS USM

From the manufacturer

Canon’s breakthrough multi-layer diffractive optical lens technology provides photographers with superior super-telephoto performance in a smaller and lighter design with enhanced correction for chromatic aberrations. We’ve also added our highly effective Image Stabilization system that gives the equivalent effect of a shutter speed two stops faster. And, it’s built to our professional standards with fast AF, full-time mechanical focus and dust and water-resistant construction.

url to full description on Manufacturer's web site.
From Wikipedia

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 currently manufactures three 400mm prime lenses:
EF 400mm f/2.8L IS II USM[2]
EF 400mm f/4 DO IS II USM
EF 400mm f/5.6L USM
The EF 400mm f/5.6L USM is Canon's least expensive 400mm lens and one of the best deals for a super telephoto 400mm focal length lens in the industry. Exceptional sharpness, minimal vignetting, very low distortion, and superb handling of chromatic aberration means this lens does not require image corrections in digital post production software. Having a maximum aperture of f/5.6, it is relatively slow.
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 Canon EF 70-300mm lens). The use of diffractive optics allows the lens to be significantly lighter than it might otherwise be, but at the cost of some image quality.[4][5]
These lenses are compatible with the Canon Extender EF teleconverters.

url to full article on Wikipedia.
MSRP 6469 US$ Aperture (large) f/4
Announced 2001 Magnification 0.12x
Length 232mm Minimum focusing distance 3.5m
Weight 1940gr Focal 400 mm
Filter diameter mm Diaphragm blades 8
Manufacturer Canon Color White
Mount Type Canon EF Category Prime, Super telephoto
Published reviews
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HAnds-on, SAmple images, VIdeo, MEasurements.
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-12T05:27:17+00:00