Optolong Clear Sky Filter 77mm Round Mounted CS 77 - Professional Light Pollution Reduction Filter for Astrophotography and Night Sky Observation

Optolong 77mm Clear Sky Round Mounted Filter

Optolong's Clear Sky Filter isis the latest light pollution filter from Optolong. This filter is designed to dramatically reduce wavelengths notorious for artificial light pollution, such as Na and Hg light pollution. As shown in the photos above, this filter dramatically increases contrast and prevents excess light from reaching your camera sensor. With the Optolong Clear Sky filter, there is no wavelength shifting or gradient images.

Housed in a round 77mm CNC-machined cell, the Clear Sky filter can be threaded directly onto the front of your camera lens, like UV lens. The filter itself is made of premium optical glass for quality you can see.