Allan. I am not using the stock focuser as I did read up on their "quality" I have a 2.5" moonlight focuser which is very rigid.
Paul, thank you for your answer with the field curvature. It did answer my question but then a new one arose!
I realise there are ALOT of contributing factors here, and I am far from am expert in addressing them all. I will get the secondary collimation spot on first and then work down the list
rimary collimation,flexture,tracking, PE and guiding.
I have not touched the rear of the scope and wont unles I get to the stage that I have to. But again looking through the tube it looks VERY concentric.
When I have clear skies Ill post a defocused star image for you guys too look at. Visually it looks pretty good but then again I could be wrong.
I appreciate all the advice and feedback.
Erik