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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.
For example, the Nikon AF-S NIKKOR 400mm f/2.8G ED VR AF lens and the Canon EF 300mm f/2.8L IS II USM lens are both fixed telephoto lenses which cannot zoom. Apertures of f/2.8 or faster are most often used, though f/4 is also found, specifically on brighter days. Particularly visible are the Canon super telephoto lenses, whose distinctive ...
The sequence of lens designations may differ in literature. See also full list of Nikon designations, Sigma designations, Tamron designations and Tokina designations.. Nikon AF-S/Sigma HSM/Tamron USD or PZD: The lens contains an integrated ultrasonic focus motor based on piezoelectricity, which enables quiet or low noise autofocus operation.
A total aperture of f / 8 corresponds to a lens aperture of f / 5.6, f / 4 and f / 2.8 with a 1.4x, 2x and 3x teleconverter, respectively. Sometimes teleconverters do not convert aperture and focal length data included in the Exif information, even if the actual focus and exposure still will be correct. Not every teleconverter will support ...
[7] [8] It is much larger than the F-mount and the E-mount used by Sony mirrorless cameras [9] but only slightly larger than the 54 mm of both the Canon EF and RF mounts. It is also slightly larger than the 51.6 mm diameter full-frame mirrorless Leica L-Mount . [ 10 ]
The EF 100–400 mm f / 4.5–5.6L IS USM is a professional EF mount telephoto zoom lens manufactured by Canon Inc. The first version of this lens was announced in September 1998, and an updated version was announced in November 2014. It is a high performance telephoto lens most often used for sports and wildlife photography.