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Optolong Clear Sky Light Pollution Reduction Screw-On Filter – 77mm Thread

Overview

NOTE: All images and descriptions from Optolong official website.

Optolong Clear Sky Filter is a light pollution filter that suppresses light pollution to improve contrast of the Milky Way. Working in Bortle 2-3 levels with natural color.

Optolong Clear Sky Filter Introduction

A screw on filter with the easiest installation like a UV filter
77mm photo filter thread for use on camera lenses that can accept this filter size. 82mm filter also available (sold separately)
Supress light pollution to make the night sky clear
Enhance the contrast of images
To bring up the colors, fascinating experience

Coating Technology

Multi-layered anti-reflection coating
Non-cementing optical substrate coating
Optolong filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) no deviation affected by temperature change.
Rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.