2" Moon&Skyglow Filter

Ontario Telescope and Accessories Verified independent store

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Moon & Skyglow filter is designed to darken the background sky by blocking light transmission from skyglow 589nm and many street light emissions from artificial light. Its high eff iciency preserves image brightness, reveals more details and increases contrast of moon, galaxies, nebulae and globular star clusters.Main Use and Performance Ideally it is quite versatile filter for visual observation and astrophotography on planetary nebula. WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning. Technical Data Optical substrate material Thickness 2.0mm Surface Quality: 60/40 (Refer to MIL-O-13830) Fine-optically polished to ensure accurate 1/4 wavefront and Show more