Explore Scientific 2" O-III Filter 6.5nm

The Explore Scientific 2" O-III 6.5nm nebula filter is designed to improve the observation of emission nebulae, even under strongly lit skies. By blocking almost all artificial light, this filter only allows oxygen emission lines to pass through, revealing celestial objects often invisible to the naked eye. This filter is particularly effective for observing nebulae such as the Cirrus Nebula NGC 6992, which becomes easily visible with a 200 mm telescope, even in urban areas. With a narrow bandwidth of just 6.5 nm, it increases contrast and clarity of deep-sky objects, making it an indispensable tool for amateur astronomers and astrophotographers. Each filter is shipped with an individual test certificate to ensure its high quality.