Duo narrowband filters vs broadband light pollution filters

[Astro NGC]

I was wondering if a duo narrowband filter (I’m looking at the zwo one with Hβ/Oiii and Hα) could work as a light pollution filter (I’m in a Bortle 5 zone) and provide somewhat true colours, since only a few wavelengths actually get through. How would this compare to using a light pollution filter with a narrowband filter (e.g. a Ha filter)?

also, since less light gets through, does this mean that you will need longer exposure time to get a comparable image?

Edited April 25, 2020 by Astro NGC

[uhb1966]

Hi Astro!

- Yes, the narrower the band, the longer the exposure as you are getting fewer photons per time unit.

- Re light pollution vs. narrow band: well, they' re different - i suggest you hunt the pictures posted here, it's also a matter of taste.

Best, U.