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ARRL Handbook 2018 (Hardcover) #0727
ARRL Handbook 2018 (Hardcover) #0727
$59.95
UltraBlockô Narrowband Light-Pollution 2 inch # 05657
[16901]
$114.95
UltraBlockô Narrowband Light-Pollution 2 inch # 05657

UltraBlockô Narrowband Light-Pollution
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"and as a thread-on for rear cells of Schmidt-Cassegrains.

pictured top right

Due to our dealer agreement with Orion, this item can not be shipped outside the USA.

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This product was added to our catalog on Monday 18 September, 2006.
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-MD-2017 Dual band  DMR/FM HT
-MD-2017 Dual band DMR/FM HT
$219.99
$159.95
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