http://epaperpress.com/ptlens/
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. Compare the two versions and download the software of your choice. Compare PTLens with DxO! Got a Mac? Try LensFix. Clones for PTLens are also available (see below).
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. Compare the two versions and download the software of your choice. Compare PTLens with DxO! Got a Mac? Try LensFix. Clones for PTLens are also available (see below).