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yeh i'm not sure what it is, I didn't notice it when I had the star out of focus as a big donut, but I wasn't really paying attention because I used my hartman mask straight away to focus it.
I'll pay more attention next chance I get and do a star test. I can't think of what it would be, as there's nothing except my spider veins and secondary that it could be.
I'll have a look tonight.
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