PTLens
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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.
It supports a wide range of prosumer and SLR cameras and if you do not find your camera/lens combination in PTlens, you are invited to forward calibration pictures to the author Thomas Niemann.