bojan does that account for all stellar objects? I understand reflection nebula, stars, etc given they are wideband and as part of that they would be cut in brightness along with the light pollution.
But thinking about it emission nebula should survive the filtering without any darkening at all given they are almost very exlusively in the Ha Hb and OIII bands.
Sorry if I sound like a little kid arguing about something he's never tried, but I'm trying to rationalise the theory with the results you were seeing.
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