Filters
Zhumell 2 inch High Performance Moon & Sky-Glow Telescope Filter
$55.99Last catalog price, November 2009
Catalog description
Zhumell 2 inch High Performance Moon & Sky-Glow Telescope Filter, part number ZHUL065, is a discontinued product from the 2007–2011 catalog. It was last listed at $55.99.
This 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.
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