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Jeff,
Thanks for replying
I found a link to the DSS forum to a post by David C Partridge who is one of the dedicated guys who took over development support of the DSS open source code in early 2018 for the benefit of us amateur astrophotographers
He described the best way to calibrate and stack using data captured over more than one night
Here it is .......
Stacking Multiple Nights Data in DSS
1/ Camera not removed over multiple nights
( same orientation, temperature and focus )
Load frames from multiple nights Lights , Darks, Flats, Dark Flats and Bias into Main Group then Check All
Register as normal and then Stack
2/ Camera removed after 1st night and re installed 2nd night and so on....( same temperature and re focused )
Must take new Flats and Dark Flats
Darks and Bias can be reused
Load all Darks ( Darks or Bias ) from multiple nights into Main Group and Check All
Load a single Light frame from night 1 into Main Group , right click and mark it as a “Reference Frame”
Leave this frame unchecked
Now load all your Lights , Flats and or Dark Flats from night 1 into Group 1 tab and Check All ( no reference frame required)
Then load all your Lights , Flats and or Dark Flats from night 2 into Group 2 tab
Register as normal and Stack
DSS will create and save a final calibrated Stacked image file ( FTS ) plus Master Dark , MasterFlat , Master Dark Flat and Master Bias files in appropriate file folder locations
I’ve also attached a PDF for convenience
Cheers
Martin
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