light pollution filter

A light pollution filter is a special type of optical filter designed to reduce or block unwanted artificial light, allowing for clearer views of the night sky. This filter works by selectively allowing certain wavelengths of light, typically those from stars and celestial objects, while filtering out the broad spectrum of light emitted by streetlights and other sources of urban illumination. For stargazers or astronomers, using a light pollution filter enhances visibility of fainter stars, deep-sky objects, and celestial phenomena by minimizing the interference of light pollution caused by urban environments.