Filters CLS RASA Origin

The CLS (City Light Suppression) broadband filter was developed to improve the visibility of a range of deep sky objects

Emission nebulae emit primarily at certain wavelengths of light - Hα at 656 nm, Hβ at 486 nm and OIII at 496/501 nm. By allowing only these wavelengths of light through and virtually blocking the rest, the filter dramatically reduces the effects of light pollution. The "bad" light is blocked while the "good" light is allowed through.You will immediately notice a much higher contrast in your images, especially in locations with light pollution!