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Thanks Peter & Martin. Great suggestions.
Star colour: Martin, I struggle to get any realistic star colour when using this filter. Often white in the center and a ring of colour on the outside. I’m thinking of getting a couple of hours of stars unfiltered and replacing the stars from the image, unless there’s an easier way to get natural colour?
Coma corrector: saving up.
Collimation: I agree collimation or pinched optics might be a slight issue. I’ll look into it. Elongation is due to the weight of the new camera causing some mouvement in the focuser. I’ll need to scratch my head on that one.
I appreciate your observations, thanks again.
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