1. Optolong Clear Sky Filter Introduction
2. Coating Technology ·Multi-layers anti-reflection coating Optolong 77mm Clear Sky Round Mounted Filter 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. Optolong Clear Sky Filter Performance I. The Milky Way on the land of snow, imaged by 拂晓_718 (China) Camera:Canon 5DS modified
II. Milk Way by Yuri Beletsky who used Optolong Clear Sky
III. Stone Forest under the Milk Way by Yule俞乐 Stone Grotoes by Optolong Clear Sky
IV. Summer Milky Way at Cameron Highlands, imaged and processed by Sammax Chong (Malaysia) Nikon D750,Samyang FishEye 12mm Optolong Clear Sky filter ISO1600,30s,F2.8, 8stacked
About Optolong While Optolong is a relative newcomer to the astronomy industry, they are no strangers to optics and filters. Optolong is a division of Yulong Optics Company, a high tech company specializing in optical filter design and production. Their products include bandpass filters, flourescence filters, edge filters, longpass and shortpass filters, beam splitters, anti-reflection coatings, optical mirrors and, of course, astronomical filters. |
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