As the website says, "PTLens is free software that corrects lens pincushion/barrel distortion, chromatic aberration, and vignetting. PTLens is available as a standalone application or Photoshop plug-in." The site offers a good collection of downloadable lens parameters for popular cameras and gives instruction on how to configure your own if your camera is not listed. I tried the Photoshop plug-in and it worked a treat, though I should add that my needs are very modest. Freeware, Windows 2000 and later, 170KB
http://epaperpress.com/ptlens/
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