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telephoto lensComprehensive Analysis
In photography and cinematography, a telephoto lens is a specific construction of a long focal length photographic lens that places its optical centre outside of its physical construction, such that the entire lens assembly is between the optical centre and the focal plane. A regular lens of a focal length that is longer than what is considered a normal lens is not necessarily a telephoto lens. A telephoto lens has to incorporate a special lens group known as a telephoto group (see below); nevertheless, non-telephoto lenses of long focal length are often informally referred to as telephoto lenses. The angle of view created by a telephoto lens is the same as that created by an ordinary lens of the same specified focal length.
If a camera lens were to be constructed from a single lens of 200 mm focal length, then when the lens is focused on an object at infinity, the lens will be 200 mm away from the focal plane where the film or sensor is. The centre of the lens is referred to as the optical centre of the lens. Even constructing the lens out of multiple elements in the regular fashion, usually to eliminate aberrations, will still have the optical centre within the construction. As the focal length of such lenses increases the physical length of lens becomes inconveniently long. But such lenses are not telephoto lenses, no matter how extreme the focal length. They are simply known as long focal length lenses. The diagram to the right shows the basic construction of a telephoto lens. It consists o..." 2) "Lens" -- As to telephoto lens1lensPronunciation: 'lenz Function: noun Etymology: New Latin lent-, lens, from Latin, lentil; from its shape 1 a : a piece of transparent material (as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light b : a combination of two or more simple lenses c : a piece of glass or plastic used (as in safety goggles or sunglasses) to protect the eye 2 : a device for directing or focusing radiation other than light (as sound waves, radio microwaves, or electrons) 3 : something shaped like a biconvex optical lens <lens of sandstone> 4 : a highly transparent biconvex lens-shaped or nearly spherical body in the eye that focuses light rays (as upon the retina) -- see EYE illustration 5 : something that facilitates and influences perception, comprehension, or evaluation <viewing the current legal battle...through partisan lenses -- New Republic> 6 : GRAVITATIONAL LENS - lensed /'lenzd/ adjective - lens·less /'lenz-l&s/ adjective Pronunciation Symbols A lens can be:
There are also places called Lens:
People named Lens include:
LENS can be an acronym for:
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