I purchased this filter to help me see some of the more challenging Messier Nebula's. In particular, reflection and emission Nebula's are seen easier with this filter - and they are. I've enjoyed clearer views of some Nebula's.
The filter does darken the view, but the nebula is very clear (and fuzzy).
I recommend it as a filter for seeing certain Nebula's.
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$99.99
Get it Jun 28 - Jul 1
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This Item  Orion 5581 1.25-Inch Oxygen-III Nebula Eyepiece Filter |  |  |  |  |  | |
| Price | $99.99 | -7% $139.99 List: $149.99 | -20% $79.95 List: $99.95 | $29.99 | -14% $47.50 List: $54.95 | $53.97 |
| Delivery | Get it Jun 28 - Jul 1 | Get it as soon as Friday, May 17 | Get it as soon as Saturday, May 18 | Get it as soon as Friday, May 17 | Get it as soon as Monday, May 20 | Get it as soon as Friday, May 17 |
| Customer Ratings | ||||||
| Sold By | Orion Telescopes & Binoculars | CelticBird | Amazon.com | Life Style Gear | Amazon.com | Astromania Optics |
| thread size | 1.25 inches | 3.2 centimeters | 31.75 millimeters | 1 millimeters | 31.75 millimeters | 3.2 centimeters |
| photo filter effect | Enhancing | Color Correcting | Enhancing | Neutral Density | Neutral Density | Enhancing |
| material | Optical Glass | metal | — | Optical Glass | Aluminum, Glass, Plastic | Glass |
| water resistance | not water resistant | not water resistant | not water resistant | not water resistant | not water resistant | not water resistant |
From the brand
Reviews with images
Arrived with a blemish in the glass coating
Arrived with a blemish in the glass coating. It's going back! It should have never left the Orion factory in Korea this way. I ordered another one, let's hope the second one is better. Performance remains to be seen; I need a good copy I can keep before I can evaluate it. Update: I received the second one a week later, and it is worse than the first. The second one has a scratch in the coating as well as two blemishes in the coating. Either these things are being used by people and then returned damaged, or the quality control in Korea is unacceptable. Orion needs to tighten up their QC. Performance of these is supposed to be great and rank right up there with Lumicon and the Thousand Oaks LP-3. I'd love to try it if I could get a good one. If the third one is bad I may just have to spend the money for a competing brand. It's a shame, too, because my Orion Moon and UltraBlock filters are quite nice, although it took two tries to get a clean UltraBlock as well.
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Reviewed in the United States on February 1, 2018
Size: 2"Verified Purchase
Arrived with a blemish in the glass coating
Reviewed in the United States on February 1, 2018
Arrived with a blemish in the glass coating. It's going back! It should have never left the Orion factory in Korea this way. I ordered another one, let's hope the second one is better. Performance remains to be seen; I need a good copy I can keep before I can evaluate it. Update: I received the second one a week later, and it is worse than the first. The second one has a scratch in the coating as well as two blemishes in the coating. Either these things are being used by people and then returned damaged, or the quality control in Korea is unacceptable. Orion needs to tighten up their QC. Performance of these is supposed to be great and rank right up there with Lumicon and the Thousand Oaks LP-3. I'd love to try it if I could get a good one. If the third one is bad I may just have to spend the money for a competing brand. It's a shame, too, because my Orion Moon and UltraBlock filters are quite nice, although it took two tries to get a clean UltraBlock as well.
Reviewed in the United States on February 1, 2018
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