2019 November: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse, Astronomer in Charge of iTelescope.net
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M81 - Bodes Galaxy
Sorry Vincent, rude of me not to reply sooner! Not quite sure how the dark spot appeared, as I didn't do anything with the background in PS as far as I remember. Still learning, so I'm sure it's probably something in my workflow somewhere 🙂