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+1 the OIII is in the visual band, so the narrower filter there should help keep the sky glow under control, even while the Moon is around. Ha is outside of most (all?) man-made illumination.
FWIW, I've got the Baader narrowband set and for kicks I was imaging the other night under a full Moon, the Orion Nebula even, which was about 25 degrees away. The background sky was noticeably brighter in OIII than in Ha.
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