Best for imaging emission nebulae, planetary nebulae, and supernova remnants
Multi-narrowband filters, also known as multi-bandpass light pollution filters, are the ideal choice for any celestial object that emits light in a specific part of the spectrum. This includes emission nebulae, planetary nebulae, and supernova remnants, which all feature gases that emit light at narrowband emission lines. This includes Hydrogen Alpha (Ha, red color), by far the most common gas found in nebulae, and other prominent gases such as Oxygen III (OIII, aqua color), Sulfur II (SII, deep red color), and Hydrogen Beta (Hb, green color). Multi-narrowband filters allow multiple emission lines to pass through at once, meaning you can capture useful data on targets that emit multiple emission lines such as Hydrogen Alpha and Oxygen III in one go with a color camera.
Mutli-narrowband filters work by isolating these emission lines and blocking out everything else, effectively eliminating most light pollution. For this reason, multi-narrowband filters are best paired with astronomy-dedicated cameras or modified DSLRs, but they can have a limited response on stock DSLRs as well. Lower-end light pollution filters allow a wider bandpass, which lets in more light pollution than higher-end filters. Higher-end filters like the Radian Triad Ultra use a narrower bandpass, which allows the nebulae to appear more contrasted from the background of space. This leads to more pleasing images, and the ability to take great deep sky images even from heavily light-polluted areas.
Explore Multi-Narrowband Filters