Lens distort is fine but sometimes you want more control, specially in animations
- Add a Separate RGB node and plug your image into it.
- Add a Combine RGB and connect every channel in it’s respective socket.
- Now you’re free to add nodes in between the two. Use a translate node to move the channels and simulate axial chromatic aberration, or get creative with the Rotation, Scale and Image Distort nodes.
You can animate them like anything else in Blender, move your cursor over the X and Y properties and press the “i” key.