G'day Marc, sorry about the thread resurrection. Was playing around on the weekend with some old data, looking at star removal etc. Came back to this thread, followed your method pretty much and it was all very clear. Even made an action for the star removal so it's kinda one click now. Refer attached
Oh yeah, go the ED80.
Question time...
Adding the stars back in! I'm ending up with halos of dark around the stars because the starless nebula is stretched I guess. Got any tips/tricks on that one? Also finding the stars look a bit wrong, kinda too small. I don't want to blow them out, but they don't look proportionate to the nebulosity if that makes sense.