Scheimpflug rule
A useful rule when using camera movements is that when the planes of the subject, the lens panel, and the image are made to coincide at a single line, everything will be in focus.
The Scheimpflug rule can be used to help you figure out the camera movement you need. For example, if your camera back is vertical, and you want to focus on the ground plane, it tells you that you need to tilt the lens forward.
The use of this technique (which is based on the principle of the Scheimpflug rule) at full aperture will permit the photographer to select at least three points in depth in the scene in front of the camera on which to focus.
lens that has a sliding front panel so the lens can be raised or lowered from its normal position to correct for verticals when shooting from high or low angles. Some also have a swing facility to control depth of field using the Scheimpflug rule.
 See also: Lens, Image, Photograph, Photography, Camera
  
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