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Hey Karl,
I had to pull it down a while ago to clean it and found one of the collimating screws for the primary was hard up against the back of the mirror. Also the secondary screws had burred the back of the secondary holder so I couldn't rotate it to centralise it. Since I sorted it and collumated it it has been really good. This is the first image I've noticed the double lines on. Looking futher into the image though I'm thinking it might have been tilt rather than collimation because the other stars' defraction lines seem fine.
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