Principal point
A point from which the focal length is measured. The principal point of a simple lens is located at the center of the lens. Compound lenses have two principal points, the location of which cannot be determined by appearance.
Principal Point
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Principal Point The point from which the focal length of a lens is measured. The principal point of a simple lens is located at the center of the lens.
Portrait Composition and Subject Placement As in every type of photography, in portraiture there must be one, and only one, principal point of interest. Naturally, in a portrait, this is the subject's face.
Focal length : The distance from the principal point to the focal point. In 35mm-format cameras, lenses with a focal length of approx. 50mm are called normal or standard lenses. Lenses with a focal length less than approx.
Focal length: The focal length of a lens is defined as the distance from the optical center of a lens (or, the secondary principal point for a complex lens like a camera lens) to the focal point (sensor) when the lens is focused on an object at ...
FOCAL POINT - (1) The central or principal point of focus. (2) The optical center of a lens when it is focused on infinity.
 See also: Lens, Focal length, Lenses, Focal, Photograph
  
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