Andy_Bird

Hey.. thanks for the info.. dropping the 5mm did the trick.. there were 5 mins of stars tonight but it was enough to prove the point. Many thanks for the help.

thanks.. just waiting A star to show.. just realised the aperture issues as well.. I was tying to focus this at f22 apparently

ok so the 11mm is the thing that the lense cap attaches to.. doh will drop the 5mm and add a few shims and hope for the best

Hey, I have just received a ASI294MC and a ZWO adapter. I am trying to pair with my sigma 150-600. If i unscrewed the different components a few mm I could get focus at 600mm but no lower (while hoping my new baby did not flop off onto the floor). However, nothing else and 600mm is not all that practical. I did not get an 11mm extension ring? Do I need to order one of these to get it all working?