Optolong CLS Filter - 2" Mounted - CLS-200
Zhumell 2 inch High Performance Urban Sky Filter - ZHUL065-1 is no longer available.
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Zhumell 2 inch High-Performance Urban Sky Filter
The Zhumell 2" Urban Sky filter increases the contrast of deep-sky objects like emission nebulae and darkens the background sky by blocking mercury vapor light transmissions and enhancing transmission in the hydrogen beta, doubly ionized oxygen and hydrogen alpha regions of the spectrum.
This Urban Sky Filter effectively blocks mercury-vapor light and higher transmission at critical hydrogen-alpha and hydrogen-beta lines than competing filters. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent on nebulas. Unlike stars, emission nebulas give off light in a very narrow range of wavelengths.
The Zhumell Urban Sky Filter allows 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.
Ships to most international destinations, APOs, and FPOs.
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