This method tries to correct specific lens errors. To do this, you need very good intensity resolution. If you have poor intensity resolution, information is lo

This method tries to correct specific lens errors. To do this, you need very good intensity resolution. If you have poor intensity resolution, information is lost and the lens errors cannot be corrected anymore. In low light, the signal to noise ratio will lead to poor intensity resolution, and the lens errors become irreversible. A better sensor will only get you so far; since light is quantized (a ray consists of individual photons), there are physical limits to the intensity resolution possible at low light. Once information is lost, there is no way to recover it. And that's why you just can't make up for a crappy lens with sofware.