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[Torsten Bronger <bronger@xxxxxxxxxxxxxxxxxxxxx>]

Public bug reported:

The focal length as shown in the GUI is incorrect.  One has to multiply
this values by (1-a-b-c) to get the proper focal length.  This is
because Hugin's distortion model scales the picture by this factor, thus
affecting the resulting focal length.  See also the discussion at
http://thread.gmane.org/gmane.comp.misc.ptx/34865

One can easily test this by using different projections for the lens
model.  This yields different values for the focal length.  However,
multiplied by (1-a-b-c), the value is (within residual errors) the same.

** Affects: hugin
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1307457

Title:
  focal length as reported by the GUI incorrect

Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  The focal length as shown in the GUI is incorrect.  One has to
  multiply this values by (1-a-b-c) to get the proper focal length.
  This is because Hugin's distortion model scales the picture by this
  factor, thus affecting the resulting focal length.  See also the
  discussion at http://thread.gmane.org/gmane.comp.misc.ptx/34865

  One can easily test this by using different projections for the lens
  model.  This yields different values for the focal length.  However,
  multiplied by (1-a-b-c), the value is (within residual errors) the
  same.

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