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Raymo the image was taken at prime focus and that's what surprised me as I felt there should have been no refractive effects. This was among the first shots I took with the GSO so haven't done any moon shots yet.
Thanks JA for your reassurance that even Hubble produces the effect as it was knowing Hubbles optical config that I went RC. I suppose I haven't looked hard enough at Hubble images to notice.
As to whether I like the coloured spike effect I don't really know but would be good to know if I can produce images without the colour. I do have another DSLR (a canon 60Da) which I will try when I break it out of its storage but it is also an APS-C sensor so I don't know if the effects will be any different.
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