3D Compositing with Action > Action: Surfaces > Modifying Surfaces >
Lens Distort Settings

Differences in camera lenses or perspective irregularities cause lens distortion that results in skewed angles. Use the settings in the Lens Distort tab to rectify or simulate these types of distortions in your images.

Distortion box
  Specify whether you want perform a lens distortion or rectification.
Distort Corrections box
  Select whether to apply radial corrections manually in this menu, or use the automatic settings derived from the selected analyzer.
Distort Analyzer box
  Select which analyzer is used to provide automatic radial corrections.
Auto Expand button
  Enable to automatically resize the surface when an attached diffuse map's Axis settings are changed. This same button appears in the Surface tab.
Centre X field
  Displays the horizontal position of the centre of the lens.
Centre Y field
  Displays the vertical position of the centre of the lens.
Magnitude field
  Displays the magnitude of radial distortion or rectification.
Adjustment field
  Displays the level of secondary adjustment of radial distortion or rectification.
Anamorph field
  Displays the ratio of radial distortion or rectification along the X or Y axis.