Hi - if you have triangular stars then it is likely the mirror clips are too tight. After fitting a mirror mask on my SW 150 I ended up with a small gap so no pressure at all. For fine collimation I found a tri-bahtinov mask a lot easier than say star testing. You line it up with the primary mirror screws which you adjust to centre all 3 patterns (on a bright star). Only takes a few minutes for perfect collimation. Your guiding sounds phenomenal. Good luck with it!

@Bortle-6-Astrophotography

11 сағат бұрын

Thanks Ray, I had tracked it down to pinched optics with a little internet research, removed my primary loosened my primary mirror clips, then re tightened to a lesser degree and reassembled earlier today. I havent been able to test yet. I shall def look into the tri batinov masks. Much appreciated!