H-Alpha 2" 12nm filter from Explore Scientific is specially designed for astrophotography, providing an effective solution for capturing emission nebulae under polluted skies. This filter blocks almost all artificial light, particularly from mercury and sodium vapor lamps, and only allows the red hydrogen emission line to pass through. This helps reveal hidden details and capture nebulae that would otherwise be invisible. With a bandwidth of 12nm, this filter significantly improves the contrast and sharpness of deep-sky objects, even in urban observing conditions. An essential accessory for astrophotographers looking to achieve exceptional images despite light pollution. Each filter comes with an individual test certificate ensuring its high quality.