i’ve Had this Orion ED80T CF for several years and have never tried it. My RASA is at Celestron for repairs, so decided to try it out. One thing for sure, needs a FF, I have one coming tomorrow. It is REALLY bad.
So in the mean time, I did this starless version. Taken over 4 nights 359x90seconds in Ha. ASI1600 gain 300 offset 50.