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I was going to write the same thing. APP does a far better job of extracting NB data from an OSC sensor either using true NB filters or the dual band filters than just shooting HA for instance and extracting the red channel. It adds to the workflow to make it really happen but it is doable.
I shot this last night (Image processing in Photoshop to assemble the bicolour by Andy01) using 6nm HA and Oiii filters with my ASI2600MC. 30 X 600 second HA and 20 X 600 second Oiii.
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