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What on earth has happened here?

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Thanks, will do.

For what it's worth, here's a sub from M13 that I took a couple of months ago (click image to see larger version then save that to see original, albeit jpg). Doesn't look like there's a problem here? As you can imagine, going from this, to what I have now, is fairly dispiriting...


Edited by BrendanC
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OK, just took a screenshot of an unfocused star - my collimation is terrible and I can see the focuser intruding.


So, this could be at least partly the issue. I will look into this!


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