2022-05-11: APP 2.0.0-beta 1 has been released !!!
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stacking multiple sessions.. combining stacked files vs using all individual subs
When you have multiple sessions to combine, I know APP has the ability to add previously stacked files to the Lights. This is what I normally do when I have multiple nights on one target. My question is this equal to adding the individual subs from each session and grouping them by the Session number and letting APP stack every sub at once? Or does one method give better results than the other?
Theoretically having individual subs is better, but when you integrate enough frames per sub-integration, it should work very well. You can always do a test for yourself of course, but I don't see big differences. Enough frames then means, at least 40-50, so APP can perform proper rejection etc. When people have 100's of frames, I always advice to divide such a set into 100-200 per integration. That will also speed up the result.
I just did a stack of three sessions of M33 Luminance data using individual subs. Previously I just stacked together the 3 stacked files and I was getting a even uneven background. Stacking the individual subs gave a much better result. My question now is that when adding the subs, APP will asking if they are from Session 1-5. Are we limited to stacking 5 sessions of individual subs at once? or is there a way to tell APP there is more than 5 sessions? Thank you for the info.
Ah yes, well there can be differences because the statistics for the background will be different compared to a lot of frames. However, you should be able to correct that background just fine with the light pollution tool.
No there isn't a limit, you can set it to a custom number. However, sessions are only meant for the case where you have different calibration files per set of data.