I am reading this topic with a lot of interest because I am on the same path of choosing the correct filter for my new Zwo Asi2600Mc pro which is on the way.... Since I live in Athens with Bortle 8-9, for sure I will buy the Optolong L extreme for, lets say, short of a narrowband imaging(I use to image with an Atik 383+mono) so I know already that I am not going to get the same Nebula details that I would like to...
but I think that I need also a Light Pollution filter that will act as a luminance filter that I can put on top of my narrowband images...and also be able to shoot some Galaxies.
Do you think that is possible to do that?