Hi all, not sure if this is the right place for this but here goes. I went out with my rig the other night to try ang get some data on the Cocoon, all looked good untill I put it inti PI. the nebula looks ok but the stars seem to have halos around them. I can live with some but as I go to the corners they seem to go realy out of shape. I have had this problem for a while but looking back at my other images it seems to be getting worse. My rig is a Askar 400 with FR and im using an Optolong Extreme filter. I know that the filer has a rep for halos but I have had no real problems with it before.
Here is some samples.
Here is the main image
Any ideas or is it just the filter? if so whats a better replacement?
Thanks for looking.