New Main: Light Pollution Filters
Light pollution filters are a type of filter designed to reduce the effects of light pollution on astrophotography and visual observing. Light pollution is caused by artificial light sources, such as streetlights and outdoor lighting, which can create a bright and hazy glow in the night sky, making it difficult to see faint deep-sky objects such as galaxies, nebulae, and star clusters.
Light pollution filters work by selectively blocking certain wavelengths of light that are associated with artificial light sources, while allowing other, more desirable wavelengths to pass through. They typically filter out light in the blue-green portion of the spectrum, which is associated with sodium and mercury vapor lamps commonly used in streetlights and outdoor lighting.
By filtering out this light, light pollution filters can help to improve the visibility of deep-sky objects and increase contrast in astrophotographs. They can also help to enhance the appearance of stars by reducing the effects of atmospheric distortion caused by light pollution.