Canon EF 80–200mm Lens
The EF 80–200mm lens is a discontinued telephoto zoom lens made by Canon Inc., Canon. The lens has an Canon EF lens mount, EF lens mount that fits the Canon EOS, EOS line of cameras. Versions There are four versions: *2.8L lens (informally known as the "Magic Drainpipe") *4.5–5.6 lens *4.5–5.6 USM *4.5–5.6 II Canon released the 2.8L version in September 1989, retailing it for about US$1,320. Canon replaced it with the Canon EF 70–200mm lens, 70–200mm 2.8L in 1995. Table References External links

Canon EF lenses Canon L-Series lenses {{photo-stub ...
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Telephoto
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. 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 in a much shorter overall design. The angle of view and other effects of long-focus lenses are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred to as ''telephoto lenses'', although this is technically incorrect: a telephoto lens specifically incorporates the telephoto group. Construction A simple photographic lens may be constructed using one lens element of a given focal length; to focus on an object at infinity, the distance from this single lens to focal plane of the camera (where the sensor or film is) has to be adjusted to the focal length of that lens. For example, gi ...
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