Dealing with lens distortion between Blender and Nuke (and Natron, Fusion, etc) just got a lot easier with Blender 2.90! We now have a Nuke lens distortion model you can use!
A few weeks ago, I was trying to figure out some correlation between the standard Polynomial lens distortion model in Blender and how to make that work in Nuke. I thought maybe there was some kind of simple equation that would make the numbers line up. When I asked Sergey about it, he just went ahead and created the new distortion model. Spectacular!