In addition to the air restlessness, brightening the night sky is the biggest obstacle to observing faint objects beyond the solar system. Thanks to street lights and other artificial lighting, the sky is no longer really black in human settlements. This also suffers the contrast and thus the perception of the deep sky objects. However, depending on the type of sky object, you can filter away some of the disturbing light and thus facilitate the photography of the objects.
The Explore Scientific H-Alpha filter uses the properties of the so-called emission mist. These objects glow in certain colours, the so-called emission lines. The emission lines are linked to certain chemical elements - in this case the red glowing hydrogen. This filter blocks all other colours (and therefore almost all artificial light) and allows only the emission lines of the hydrogen through. The disturbing light of mercury and sodium steam lamps is effectively blocked. The effect is amazing: Suddenly, fog is visible in the photos in places that appear completely empty without a filter.
The Explore Scientific H-Alpha fog filter has been developed exclusively for astrophotography. Especially with slightly lightened sky, many emission mists occur first when using this filter and are shown in full expansion on the astrophotos. The H-Alpha fog filters make astrophotography near the city possible and the use leads to amazingly good image results despite the existing light pollution. A must have for any urban astrophotographer.
The EXPLORE SCIENTIFIC fog filters come with an individual test report - so you can...