|
Just to relate a bit more of the story: I now use a cheshire (with cross-hairs) for the refractor. The 2 donuts one sees were perfectly lined up, with the cross-hairs central on top of those. (with diagonal in place).
I have not checked to see how far out it is now by way of cheshire....it's a safe bet to assume those 2 donuts will be seperated a long way! Actually I'll go & check it right now.
|