CXB (formerly Astrodon) L2P Light Pollution Luminance FilterOur L2P filters are designed to be used the same way that you would use a regular Astrodon Luminance filter, either by itself or as part of a LRGB filter set. The L2P filters are recommended for imaging in urban and or light polluted areas. If you have dark skies, the regular Astrodon Luminance filter from the set is what you want to use. But if you have light polluted skies, you are better off with the Astrodon L2P Luminance filter because it blocks