Optolong CLS Filters Guest Pager System and star clusters

and star clusters

and scanning star fields or open clusters

Bright globular clusters remind me of sugar spilled on a black table cloth

25" and 2" focusers

Optolong CLS Filters Guest Pager System and star clustersThe Optolong CLS (City Light Suppression) broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i. e. skyglow). Together with the highly