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Hmm, looks like a little sag somewhere, but always the question is finding out where. Not that I pay much attention to CCDinspector. I find it often can give inconsistent readings. The second reading for M17 shows what I would say as being near perfect. Maybe just chase up the subs Doug. I know that sometimes when stacking I get some slight elongation from the rotation of the sub, because CCDstack thinks it needs to be rotated just a little, which is completely wrong.
Just checking on your M17, the stars are definitely a nicer shape, so maybe a stacking issue or some slop somewhere in the imageing train. Is everything screw fixed? I noticed that once I went to screw fixing all the way along my stars really improved a lot.
Anyway just teething problems really. Still a nice image all the same Doug.
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