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Dramatically Improves Views of Emission and Planetary Nebulas
If you observe from highly light-polluted sites, or if you want the maximum contrast enhancement for observing faint emission nebulas from areas of moderate light pollution, an Orion UltraBlock 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.
UltraBlock filters block all forms of light pollution. They reject wavelengths 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.
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."
(#5654)
Price: $89.99
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