Hi Brian, thanks. Yea focus and maybe collimation too. I've been struggling with these old sonotube ota's for a long time and dont think they've ever been exactly right.
So I have 3 or 4 problems all compounding. Actually there's even more problems than that but if I can get the above improved that'll make a huge difference.
Can you look at that Andromeda picture and tell me what the horizontal lines are? They are in a lot of the images from that night.
Thanks you guys, Dan