The broadband telescope filter blocks out the most common wavelengths of light pollution while letting through desireable wavelengths with little attenuation, resulting in high-contrast, much clearer better deep-sky views.
The filter is able to make light-polluted skies appear much darker, at the same time enhancing the colours of deep sky objects. Thanks to the improved blocking of mercury-vapor light and higher transmission at critical hydrogen-alpha and hydrogen-beta lines.
This contrast-enhancement effect is particularly apparent on nebulas. Unlike stars, emission nebulas give off light in a very narrow range of wavelengths. SkyGlow filters allow maximum transmission of the important wavelengths of hydrogen-alpha, hydrogen-beta, and doubly ionized oxygen-the ones most commonly emitted by nebulas. Views of galaxies and star clusters are also enhanced, although not as much.
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