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There are a few good choices in relation to filters, but budget often makes the decision. I was always partial to Baader narrowband filters.
For true narrowband imaging, in my opinion, a mono camera is a must have device. The nature of colour camera Bayer matrix construction will reduce the ability to capture the fairly rare photon emissions in narrowband spectra areas.
For simple light pollution filtration, there are many filter in that space, but the choice may come down to what type of sky glow your dealing with. LED street lights will require a different solution then the sodium vapour lights used widely in places like Brisbane.
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