Optolong CLS Filters Guest Pager System Wired microphone headset with one-key

Wired microphone headset with one-key recording function

and scanning star fields or open clusters

25" and 2" focusers

mounts and filter wheels

Optolong CLS Filters Guest Pager System Wired microphone headset with one-keyThe 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