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- Neither ROMAFOT nor DAOPHOT managed to reach the limiting S/N ratio.
- The shape of the PSF has a large impact on the performance
of the photometric packages in the case of undersampled PSFs.
- Rebinning the image to double the original pixel resolution
showed no large difference in accuracy for ROMAFOT but increased
both limiting magnitude and accuracy for DAOPHOT.
- Deconvolving the test images did not increase accuracy, either for
ROMAFOT or for DAOPHOT.
- In view of the above shortcomings, local software (Linde 1989)
is currently being adapted to HST PC images in order to
better approach the theoretical photometric limit.
