[Compositing] How do I get this camera effect in Blender?

If you look at the edges of this image it looks almost as though it is stretched and the colors are being refracted. It creates a really great aesthetically pleasing image, and I’ve seen the effect being used more and more in Blender images but, I have no idea how it is achieved. Does anybody have a tutorial on this?

In the nodes, Add>Lens Distortion then adjust ‘Dispersion’.

Woah! That’s awesome! Thanks.