That’s a wonderful image, Alex, and one of the few that I’ve seen (says the utter newbie
) where the core isn’t blown in some way - awesome HDR processing to bring out the bold and subtle detail and lovely colour. For the flats, darks and dark flats I recommend keeping an extensive library (if you don’t already have one). I made one for all camera and filter combinations and used the practical exposure combinations I expected to use - I don’t deviate from these combos. TBH, it’s <naughty word> painful to setup but once done, it’s proved easy to maintain. Alex