Hi Markus.
Thanks for your reply.
Yes, I did see that post, and it looks very good, but I didn't have the equipment to do it. Maybe I need to buy a barrel type camera and cctv lens.
I am testing on an out of focus star which shows the central obstruction off centre. I can't seem to get it centered via the star test. My images show severe "coma" on the left and difficult to get focus. I am using an STT8300 with the 8pos filterwheel and guider, which is quite heavy, so I guess there is some tilt there as well.
This is one image,
https://www.flickr.com/photos/185680...posted-public/ which I was happy with, but they are now getting progressively worse, and if I have to do a meridian flip, I can't align the stars.
Thanks,
Andrew...