Scheimpflug principle
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The Scheimpflug principle is named after Austrian Captain Theodor Scheimpflug and deals with the change of the focus plane when tilting the front standard of a view camera. When an oblique tangent is extended from the film plane, and another is extended from the lens plane, they meet at a point. To get the correct focus on a subject, a plane formed by the desired area of critical focus within the subject(s) should, if extended, intersect with the previously explained point. If this is achieved, then the focus should be as good as it will get from a particular location of the camera.
Scheimpflug references the concept in his 1904 British patent GB1196/1904. The concept was described earlier in Jules Carpentier's 1901 British patent GB 1139/1901 for a perspective correcting photographic enlarger.de:Scheimpflugsche Regel fr:Loi de Scheimpflug ja:シャインプルーフの原理 nl:Voorwaarde van Scheimpflug
