I managed to get a further 10 hours to add to the initial 7 hours taken using the Sky 90/M26C array – 20-minute sub-exposures.

I don’t think that the additional 10-hours added much in the way of depth to this image, but it did mean that I didn’t need to use any noise reduction like I had to with the 7-hour image.  This is worth remembering for future “marathon” imaging sessions.  Probably not worth going beyond the “magic” 8-hours per frame.

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