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Hi Tony,
Just waking from 2 days of Flu sorry for not replying sooner. I haven't taken any direct 30 second images of really bright stars, as what I see in my 30 second galaxy/star images looks fine to me. I am working with a Starlight Xpress SXVH9 @F7 so my field is small at 13x11 arc minutes. I will get around to doing that with Joshuas old scope this weekend and mine maybe next week. It would not surprise me if there were a ring around really bright stars given the light collection of the scope/moisture & on the corrector etc and that a few have reported similar, I have seen a similar effect in a 30 second image if a reasonable bright star is nearby . Even so if the galaxy/star images are as good as in my LX200R then I see no need to worry.
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