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Peter,
My 2c.
Just to add to Jeff's comments.
In Registax I work from #6 downwards (Think of #6 as trying to correct the seeing. Each step down affects smaller and smaller image detail.)
As an alternative look at ImPPG. IMHO it gives better results (for me) than Registax.
When stacking in AS3! try different quality stacking %ages, be guided by the green quality line. I find down here on the coast between 20% and 40% (ie best 20% to 40%) works OK.
I don't use a calibration image.
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