20-07-2013, 10:28 AM
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Registered User
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Join Date: Aug 2012
Location: West Coast
Posts: 787
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Hi Elio, Thanks.
I used a crappy lens – 17-200mm, and what I didn’t notice is that when it is used in a vertical position with each shot the zoom ring moved slightly, so by the time I collected 30 images the difference between the first and the last was more than I’d say 15%.
PixInsight could hardly work this out, but because the centre of the frame look OK I didn’t worry about the corners.
Also, thanks for pointing out the 9th Messier …
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