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keystone distortion cause

  • From: P3D Kirk W. Charles <kirk@xxxxxxxxxxxxxxxxxx>
  • Subject: keystone distortion cause
  • Date: Fri, 27 Jun 1997 10:12:03 -0400
> The term "keystone distortion" obviously derives from the fact that a
> rectangular object assumes this shape on film when the film plane is not
> held parallel to the object.  In this case it is a visually descriptive use
> rather than a metaphorical one.

Rather keystone distortion is caused by the lens axis not held perpendicular to
the object.  This seems, at first, contrary to ones intuition.  I would
interested persons get a book on view camera use.  The shape, form and focus
changes should be clearly explained.

Kirk


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