Chromatic Aberration

Bad camera lens create an effect called Chromatic Aberration, wich causes noticeable color artifacts specially at shapes borders with a strong light contrast. Its due to the different index of refraction for different wavelenghts of light in the lens.
The effect is distance dependent. That means, the artifacts increase with distance. It has also been blured, to fit with the real behaviour.
So here is my aproximation:

Comparison: