Great question. The biggest difference is contrast. The narrower the band, the more contrast you will get between the gas you are trying to image and the background sky. It's also harder to manufacture a narrower pass filter so the cost goes up as things get narrower. There is a great comparison here: astrodon.com/products/astrodon-narrowband-filters/
Love your videos ! Would love a discussion on your thoughts of 6nm vs 12 nm, etc.
Great question. The biggest difference is contrast. The narrower the band, the more contrast you will get between the gas you are trying to image and the background sky. It's also harder to manufacture a narrower pass filter so the cost goes up as things get narrower. There is a great comparison here: astrodon.com/products/astrodon-narrowband-filters/