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               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.
              Zhumell's UHC, or Ultra High Contrast, filter decreases the effects of
light pollution caused by natural and artificial sources. With this
filter, the background sky appears darker in the eyepiece, increasing
the visibility of your favorite deep-sky objects. This filters out
specific wavelengths of light to create high contrast and to make
nebulae clearer and more visible, where normally, we may not be able to
see it with our eyes alone.

Filed under: Eyepieces & Accessories