Optolong Clear Sky Filter - 77mm Round Mounted - CS-77

The Clear Sky Filter is Optolong's newest light pollution filter. This filter is specifically designed to eliminate wavelengths responsible 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. You are left with a true-color, high-contrast image.

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