how to make lens distortion work?

hi eric!
thank you very much, that sort of worked. I mean it does work, so thanks for solving the problem!
but this shader itself is not really what I was hoping I think.
is there a easy way to apply a simple barrell distortion to the camera without going super crazy on the FOV?
if you have any suggestions, that would be amazeballs.

thank you :slight_smile: