OPTOLONG CLS FILTER Tilter The Sky-Watcher Light Shroud is

The Sky-Watcher Light Shroud is an essential accessory for every Collapsible Dobsonian Telescope for high image contrast

Massimo Riccardi

Supported gear

Earth rotates with respect to astronomical objects

Inner connection

OPTOLONG CLS FILTER Tilter The Sky-Watcher Light Shroud isThe Optolong CLS (City Light Suppression) broadband filter is designed to improve the visibility of emission deep sky objects. It selectively reduces the transmission of wavelengths of artificial light, specifically those produced by mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i. e. skyglow). The high transmission in the main nebula emission