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The star field from the continuum filter can be subtracted from any NB filter image or any image for that matter. It just works better if the optics are the same or very similar. The delta lambda over lambda is about the same for anything with a continuous spectrum. It is just a matter of controlling the amount by exposure and weighting for the subtraction.
The continuum filter will work for all NB filters.
You did see OIII data in one image below? Maybe this may tell you something!
Bert
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