Thanks John, I would not be surprised at all that it is my technique. I've done some more reading (
http://www.propermotion.com/jwreed/A...te/Chesire.htm ) to properly understand what I am trying to achieve with the Orion tool and I believe I now do understand, particularly the role of the reflecting surface on the Cheshire. The instructions that came with it weren't crystal clear to me. I'll re-read them tonight and I will probably now understand them as well
.
With my 8" f6, the laser collimation has always been so quick and apparently successful, I haven't worried about anything else (apart from initial sight tube checking). With the new 12" f5, I'd better improve my capability! Eric
