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Pincushion effect correction
If the zoom lens of your digicam suffers from barrel distortion at the wide end of the zoom, chances are pincushion distortion will be present at the tele setting.
Pincushion effect
Lens aberration (distortion) causing parallel, straight lines at the edge of the image to curve inwards.
(see Aberration, Distortion & Barrel distortion) ...
 See also: Image, Camera, Barrel, Subject, Aberration
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