This Shader does a per wavelength Dispersion in a refractive material.
It was made for educational purpose, for Open Shading Language teaching.
It should be optimized and rethink for an effective production use.
It is brut force dispersion shader and need a lot render samples to have a nice look.
Indeed, it works well and does the job !
Download it and learn more about it at : vadrouillegraphique.blogspot.fr/
Indeed, result are really good for still pictures.