I just got started in AP about two years ago, I am shooting with a Nikon D5600, ha modified; I have an older Stellarvue SV080S refractor and I use the SFF6-2.5 flattener. I am auto guiding with a Lacerta MGEN 2 using a 50mm guidescope. All this in on an AVX mount. I believe I have some minor tracking or alignment issues (tilt?).
I was wondering if folks could offer an opinion of the attached snippet? This is a serious zoomed-in view of an issues I see on a lot of my stars. There is some color mis-alignment at the edges of the star.
What do yo suppose the root cause of this is? And how might one address it?
Thanks in advance.