Well, still not happy with the focus. I have improved it by moving the barlow out of the focusser and working from there, but it is still not a crisp image.
Have checked the collimation - it is good, apart from the fact that I can't seem to adjust the primary mirror. The secondary is adjustable and I have done so when I brought the scope home, but the primary doesn't seem to have locking screws and adjusting screws, just one set of screws at 120 degrees separation. Even so, the mirrors seem to be well-placed and centred.
I still have to do the star check and see if I get the concentric rings.
Any more bright ideas from anyone?
John
