Adam,
I had read the CN article before when I was troubleshooting what turned out to be diffraction rings with my Astronomik narrowband filters on my EdgeHD.
As far as the star profiles, they would change shape slightly as I worked on getting the b…
Blockhead,I am sorry I was not clear. I meant the circular gradients around all the images where it is vignetted in some of the corners, then light, then a dark ring, then neutral in the middle. I do not get this effect with the Ha images and flat…