PTLens is a free software that corrects lens pincushion/barrel distortion, chromatic aberration, and vignetting. PTLens is available as a standalone application or Photoshop plug-in and support most of the latest camera and lens. Here’s a summary of the review from Outback Photo:

“There are some Photoshop plugins on the market that do a nice job to correct some distortions. But there are only very few solutions that are based on camera/lens profiles. One of those solutions is DxO Optics Pro. Unfortunately DxO Optics Pro shows a couple of shortcomings in its current incarnation:

• Not cheap
• Works not with current raw converters
• JPG only (means 8 bit only)
• Limited cameras and lens profiles
• No PS plugin

Here the PTLens solution by Thomas Niemann shines:

• Free
• Works with Camera Raw 2.2 and Capture One 3.5
• is 16 bit capable
• Quite a collection of camera/lens profiles available (huge effort by Thomas Niemann!)”

Website : PTLens Official Website

Website : PTLens Review at Outback Photo

Download : PTLens Plugin download