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I agree that finding the best PSF is great but I found that getting close if good for me.
With galaxies it is much easier as you can hit the galaxy very hard as it's signal is very high.
So I normally do at least 100- 150 iterations with CCDstacks positive constrant. It rings the saturatued stars but I do not use them as I blend in the decon details of the galaxy into orginal with a hide all layer mask. After "painting" in the mask to reveal the galaxy details I then feather the mask with a blur or with PSCS4 you can directly feather or adjust the mask edge.
Then boom - detailed galaxy while leaving the stars alone.
You can use a small (20 -50 iterations) decon to tighten the smaller non-saturated stars then use a mask to blend in the larger stars.
Then you end up with a super sharp Lumiance to add to your RGB. Once the RGB has been added and adjusted then I use a PS plugin called FocusMagic - but that is another story.
Regards,
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