Orion UltraBlock Narrowband Filter - 2" Round Mounted

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Orion UltraBlock Narrowband Filter - 2" Round Mounted
$119.99
Item # OR-5657
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  • The Orion Ultrablock Astronomy Filter works best for heavily light-polluted skies and for high contrast views of faint nebulae.
  • Presented in a 2" round format mounted in a threaded, anodized aluminum cell.
  • The Orion Ultrablock Astronomy Filter blocks all forms of light pollution, including pollution from incandescent and fluorescent lighting.
  • Provides high transmissions of hydrogen-beta and ionized oxygen wavelengths.
Description

Details

Orion 2" UltraBlock Narrowband Filter

If you observe from highly light-polluted sites, or if you want the maximum contrast enhancement in observing faint emission nebulas from areas of moderate light pollution, an Orion UltraBlock telescope filter is for you. With an UltraBlock, emission and planetary nebulas are even visible from urban areas, where they are completely invisible without a filter! In darker-sky locations with only moderate light pollution, many objects will appear significantly enhanced over unfiltered and wideband filtered views.

Orion UltraBlock Telescope Filters block all forms of light pollution, including both narrowband mercury- and sodium-vapor lighting and broadband light pollution sources. UltraBlock Filters reject pollution from incandescent and fluorescent lighting, which wideband filters can't stop. Extremely high (99.9%) blocking of critical mercury and sodium emission bands and very high transmission of hydrogen-beta and ionized oxygen wavelengths result in the highest contrast gain of any competing light pollution filter.

Orion 2" UltraBlock Narrowband Filter Features

  • The Orion UltraBlock is the ideal eyepiece filter for deep-sky observers located at highly light-polluted sites
  • Narrowband filter blocks all forms of light pollution
  • Enhances the presence of a significant number of fainter deep-sky objects
  • Compatible with threaded Orion 2" eyepieces
  • Save yourself a trip to dark skies - with the UltraBlock filter you can enjoy the stars from the suburbs!
A User's Report: "The Orion UltraBlock filter was a real surprise for this observer. It of course reduces the brightness of stars, and diminishes the image of globular clusters, but the resultant black sky background is astonishing. On my first try of the UltraBlock, I observed the Orion Nebula rising just above my roof early one evening. The entire sky was pink to the naked eye, and hardly any background stars were visible in the telescope. The nebula was a washed-out and vague caricature of the stunning sight that it is in a desert sky. In went the UltraBlock, and suddenly the faint tendrils of glowing clouds were visible, against a velvety deep-black background! I eagerly turned the telescope to the Pleiades, and the UltraBlock unmistakably brought out the nebulosity around several of the brightest stars...in a 4" telescope! In a few moments I had found the vague cloud of M1, which I have never been able to view from my urban front yard. Before using the UltraBlock, I had felt that my front yard was suitable only for planetary observing. Now that I'm hooked on the UltraBlock, I spot a new Messier object within minutes each time I take out my telescope."

Orion Product Number: 5657

Additional Information

Additional Information

SKU OR-5657
Manufacturer Orion
Type of Filter Contrast Booster, Light Pollution Reduction
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 2"
Filter Shape Round
Filter Mounted? Mounted
Warranty Orion Limited Warranty
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Included Items

  • Orion UltraBlock Narrowband Filter - 2" Round Mounted
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