Thus any focal length lens mounted on a view camera or field camera, and many press cameras can be used with perspective control. Most large format (4x5 and up) cameras have this feature, as well as plane of focus control built into the camera body in the form of flexible bellows and moveable front (lens) and rear (film holder) elements. There is more information on this in the view camera article. Professional cameras where perspective control is important control the perspective at exposure by raising the lens parallel to the film. This "distortion" is relative only to the accepted norm of constructed perspective (where vertical lines in reality do not converge in the constructed image), which in itself is distorted from a true perspective representation (where lines that are vertical in reality would begin to converge above and below the horizon as they become more distant from the viewer). The popularity of amateur photography has made distorted photos made with cheap cameras so familiar that many people do not immediately realise the distortion.
A common case is when a photo is taken of a tall building from ground level by tilting the camera backwards: the building appears to fall away from the camera. Perspective distortion occurs in photographs when the film plane is not parallel to lines that are required to be parallel in the photo.
Perspective control is a procedure for composing or editing photographs to better conform with the commonly accepted distortions in constructed perspective.
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