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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.
A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length. [ 1 ] : 93 This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus 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.
Weighing in at just over a kilogram, the recently launched Tamron 100-400mm f/4.5-6.3 Di VC USD only weighs about two-thirds as much as most 70-200mm f/2.8 lenses, but delivers twice the telephoto ...
An image produced by this method is sometimes referred to as a bokeh panorama [3] (or the portmanteau bokehrama) [4] in reference to the deliberate blurring style of bokeh photography. The process requires taking multiple shots of a scene in a manner that allows for later image stitching using a fast lens , generally of a focal length of 50 mm ...
[6] A wide-angle lens has a shorter focal length and includes more of the viewed scene than a normal lens; a telephoto lens has a longer focal length and captures a small portion of the scene, making it seem closer. Lenses are not labeled or sold according to their angle of view, but rather by their focal length, usually expressed in millimeters.
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