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Revision as of 22:30, 13 July 2006
PTLens is a free add-on for Panorama Tools that automatically corrects for vignetting, pincushion distortion and barrel distortion. It has received rave reviews from professionals around the world and is available as a Photoshop plug in, as a stand alone program for Windows and as a command line utility for windows.
There is a command-line version called clens that uses the same database of lenses and which is available for Linux, Windows and OS X.