This is a lens distortion workflow specifically for VFX productions using NukeX By David Cattermole.
This is a follow up to a previous tutorial:
The Undistortion gizmo (and python scripts): Download Link
David Cattermole have found and fixed the "node not connecting when it's created" bug,  He used 'nuke.nodes.Undistortion()', when He should have used 'nuke.createNodes("Undistortion")' in the file.
The updated package is here: Download Link