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Hi Peter,
Thought I had the focus ok but I'll see what happens next time. The main star images seem reasonable. The double ring around the brighter stars is whats got me. Has anyone experienced that with poor focus?
A little bit of CA on very bright objects I can accept (yes it is a refractor) - there will definitely be a small amount but in DSLR images it hasnt been too noticeable.
I'll also be seeing if the flip mirror unit could be contributing in some way by removing it from the equation and as mentioned will be very careful with focus.
The double ring halo has me quite perplexed.
Cheers
David
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