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. make all parallel lines (such as four horizontal edges of a cubic room) cross in one point.This is a commonly accepted distortion in constructed perspective perspective is based on the notion that more distant objects are represented as smaller on the page however, even though the top of the cathedral tower is in reality further from the viewer than base of the tower (due to the vertical distance), constructed perspective considers only the horizontal distance and considers the top and bottom to be the same distance away This includes columns, vertical edges of walls and lampposts.

make all lines that are vertical in reality vertical in the image.

Perspective control is a procedure for composing or editing photographs to better conform with the commonly accepted distortions in constructed perspective.

Dxo perspective