Thanks chaps - I'm learning, experimenting with my processing workflow, so I'm open to any and all suggestions
it's hard for me to grasp how things should look... natural colours and so on.
As an update to my previous comment about the spacer...I tried again last night with the spacer inline and got stretching (like warp drive) effect on stars from about 2/3 the way out getting worse towards the edge. I took some shots of the same scene as above for comparison, and I don't see that effect on my shots from SPSP...so I can only assume that without the spacer is closer to optimal
