I have no idea Simon what other software could do it automatically. It's probably a once off anyway. I'm finding the SW ED100mm refractor produces sharper and better defined images than the 6" Newt and it goes just as deep. In theory a 100mm refractor shouldn't equal a 155mm Newt, but the mirror on my Newt is old and maybe not as reflective as it used to be. So for now I'll be shooting only with my refractors.
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