Thanks Ray, appreciate that.
I've had a look around for images taken with the scope and so far I haven't seen anything bad, but I also haven't seen any Sony CCD + GT102 images either. Hopefully this is one that minimises the effect you speak of.
Sadly, true premium refractors are out of the budget (unless I'd like a new wife to go along with it) and this is about all I can afford.
The SW Mak Newt is definitely out due to the 1.4m focal length. I had actually considered the ES 700mm MN but after reading a bit I got the impression this design is sensitive to collimation issues and it sounded like just another thing to go wrong.
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