Project: datamanagement
Issue DM-1134: implement SDSS PSF residual trick
SDSS galaxy fitting approximated the convolution of a galaxy model with the PSF as the convolution of the galaxy model with a simplified approximation to the PSF added to the difference between the PSF approximation and the true PSF. We should do the same, as it'll be no worse than ignoring the difference between the PSF approximation and the true PSF, and it may greatly reduce the complexity needed in the approximation.
Story points: 8