The Explore Scientific 1.25" H-Alpha Nebula Filter (12nm) filter uses the property of the so-called emission mist. These objects glow in certain colors, the so-called emission lines. The emission lines are linked to certain chemical elements, in this case the red glowing hydrogen. This filter blocks almost all artificial light to improve viewing of nebulae, passing only the emission lines of the hydrogen. In particular, the disruptive light from mercury and sodium vapor lamps is effectively blocked. The effect is amazing: Suddenly fog becomes visible in the photos in places that appear completely empty without a filter.

The Explore Scientific H-alpha mist filter has been developed exclusively for astrophotography. Especially when the sky is slightly brightened, many emission nebulae only come to light when this filter is used and are shown in full extent on the astrophotos. The H-alpha nebula filters make astrophotography near cities possible and their use leads to surprisingly good image results despite the existing light pollution. It is a must for every urban astrophotographer. The Explore Scientific mist filters are supplied with an individual test report, so you can be sure that you are receiving high-quality filters.