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I capture dawn and dusk sky flats using ACP and two sessions are adequate to capture a dozen flats for each filter (full set of LRGB and Ha/Oiii/Sii). That gets me to my target of 500Ke- per flat master. Fortunately, my camera has deep wells so 12 flats is plenty, but it also has slow downloads and a smaller sensor would probably be able to capture more flats in the available time.
ACP automates the process nicely, tracking the anti-solar point and taking test exposures to judge the right time to start flats for each filter. It would be difficult to do effectively as a manual process.
Cheers,
Rick.
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