Cutting out light pollution using RGB with mono camera

[SB]

Hi All
It is common to use filters for OSC to cut out light pollution giving near broadband colours (such as the Optolong L-Pro) but how is cutting out light pollution achieved with RGB using a Mono camera? Are LP filters used in front of the RGB set?

Thanks

Chris

[multiweb]

When you use a mono with color filters you're already narrowing the bandpass. Unless the LP falls within the spectrum you're imaging it's already filtered out.

[SB]

Hi Marc,
... but aren't the RGB filters for Mono just replacing the RGGB bayer matrix in an OSC to provide a colour image. Thus the effects of Light pollution are the same on both OSC and RGB with a Mono camera?

Chris.

[multiweb]

The bayer matrix has some color filters embedded in the micro lensing. I don't know what the bandpass would be. But color filters have a known bandpass. Some are narrower than others. So I'd say it's easier to control LP with a mono. You can stack filters together if you want (LP + color). Depending on the transmittance you might have to expose longer.

[SB]

... OK got it. Thanks Marc