I do automatic background removal in PixInsight and don't overthink it, but you can also do it manually by placing targets (little squares) there, just like in other programs.
It only seems that way :) Until you realize that you need to refocus for each filter and when the temperature changes by a couple of degrees, and so on and so forth.
I focus manually, since I'm using a Bahtinov mask anyway.
I also take separate flats for each filter. Moreover, it seems the filter wheel needs to be assembled in a clean-room-like environment. Since it doesn't seat perfectly precisely, the dust on the filter must always stay in the same place for the flat to work correctly.
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I also take separate flats for each filter. Moreover, it seems the filter wheel needs to be assembled in a clean-room-like environment. Since it doesn't seat perfectly precisely, the dust on the filter must always stay in the same place for the flat to work correctly.
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