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🌠 Make every nebula POP — See the unseen in your night sky!
The Astromania O-III 1.25" Filter is a premium narrowband filter designed to boost contrast of gaseous and planetary nebulae by transmitting 95% of the double ionized oxygen emission lines (496-501nm) while blocking nearly all other visible light. Its universal 1.25" threading fits most telescope eyepieces and accessories, making it a versatile tool for deep-sky observers and astrophotographers alike. With advanced multi-coatings to reduce glare and ghosting, this filter excels in both light-polluted urban environments and dark sky locations, delivering crisp, high-contrast views of faint nebulae and planetary details.
| ASIN | B0141U979O |
| Best Sellers Rank | #53 in Telescope Filters |
| Brand | Astromania |
| Built-In Media | 1 x 1.25 Inch O-III Filter |
| Coating Description | Multi Coating |
| Color | 1.25" O-III |
| Compatible Devices | Telescopes with 1.25 inch filter threads |
| Customer Reviews | 4.4 4.4 out of 5 stars (150) |
| Enclosure Material | Aluminum, Optical Glass |
| Item Dimensions L x W | 1.25"L x 1.25"W |
| Item Highlight | Light Pollution Filter for Astronomy Telescope, Fit 1.25" Eyepiece, Improve Image Contrast, For Orion Swan & Extended Nebulae |
| Item Weight | 8.53 g |
| Manufacturer | Astromania |
| Manufacturer Part Number | SKU_AM_OF1 |
| Media Type | ProductImage |
| Model Number | SKU_AM_OF1 |
| Number of Items | 1 |
| Photo Filter Size | 31.75 millimeters |
| Screen Size | 1.25 inches |
| Set Name | 1.25 Inch O-III Filter Set |
| Special Effect | Enhancing |
| Thread Size | 31.75 millimeters |
| Water Resistance Level | Moisture Resistant |
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