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Dramatically Improves Views of Emission and Planetary Nebulas. The
UltraBlock is the filter for deep-sky observers located at highly
light-polluted sites. Blocks all forms of light pollution - mercury
vapor and sodium emission bands - while passing the critical
hydrogen-beta and ionized oxygen wavelengths. With an UltraBlock,
emission and planetary nebulas "surface" from the washed out background
sky. In dark skies, the UltraBlock also enhances the sky presence of a
significant number of fainter deep-sky objects over unfiltered and
wideband-filtered views. Available in 1.25" and 2".
