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25 inches)
thereby blocking even more light from artificial lights and airglow
Includes: Explore FirstLight 80mm Refractor
control knob with knurl
Nebula Filter H-Alpha 2-inch 7nm Optical Design_Refractor 25 inches)In addition to the turbulence in the air, the brightening of the night sky is the greatest obstacle to observing faint objects beyond the solar system. Street lights and other artificial lighting mean that the sky in human settlements is no longer properly black. As a result, the contrast and thus the perception of the deep sky objects also suffer. Depending on the type of celestial object, however, part of the interfering light can be filtered out,
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