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Electronics > Camera & Photo > Accessories > Telescope Accessories > Filters |
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Product Description 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.The UltraBlock is the filter for deep-sky observers located at highly light-polluted sites. 2" Orion UltraBlock Narrowband Eyepiece Filter Shipping Weight: 1 pounds | ||||||||
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