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Thanks for the reply, Ivo. The halos seemed to have disappeared when I saved the original .tif to a .jpg format. (Or maybe I have been looking at these images for too long? )

This is a 13X300s@1600iso shot of M1 (80mm APO Orion refractor) that I am trying to process. Obviously the nebula is overexposed and there is an overall reddish cast to the stars and background (the camera is a modded Canon 40D.). If possible, how do I correct? Thanks.
Michael

sized_Autosave.jpg Hi Ivo, Look especially at the fainter stars. Could this be an artifact from some type of masking during processing that I somehow didn't do correctly? Michael ps. When I look at a crop of the star field, now I only see that there is a focus problem. I no longer see the halos!!! ...

Forgive me if this has been addressed before. What is the cause and the fix for the small halos around stars (especially around the fainter ones)?
Michael