--- product_id: 218266086 title: "Astromania O-III Filter 1.25inch Telescope Filter Narrowband Nebula Filters" brand: "astromania" price: "€ 140.72" currency: EUR in_stock: true category: "Astromania" url: https://www.desertcart.hr/products/218266086-astromania-o-iii-filter-1-25inch-telescope-filter-narrowband-nebula store_origin: HR region: Croatia --- # Selective 496-501nm O-III narrowband pass 1.25 inch precision fit Anti-reflection & dichroic coatings Astromania O-III Filter 1.25inch Telescope Filter Narrowband Nebula Filters **Brand:** astromania **Price:** € 140.72 **Availability:** βœ… In Stock ## Summary > 🌠 See the unseen: Unlock nebula secrets with precision O-III filtration! ## Quick Answers - **What is this?** Astromania O-III Filter 1.25inch Telescope Filter Narrowband Nebula Filters by astromania - **How much does it cost?** € 140.72 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/218266086-astromania-o-iii-filter-1-25inch-telescope-filter-narrowband-nebula) ## Best For - astromania enthusiasts ## Why This Product - Trusted astromania brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Light Pollution Slayer:** Blocks 95% of unwanted wavelengths, turning urban skies into deep space portals. - β€’ **Pinpoint Nebula Contrast:** Isolates double ionized oxygen lines for razor-sharp nebula views even in light-polluted skies. - β€’ **Advanced Optical Coatings:** Anti-reflection and dichroic interference coatings eliminate glare and ghosting for crystal-clear observation. - β€’ **Astro-Grade Quality Assurance:** Each filter is individually inspected and inscribed with exact light transmittance for guaranteed performance. - β€’ **Universal 1.25" Compatibility:** Fits seamlessly with any telescope sporting a 1.25-inch filter threadβ€”no adapters needed. ## Overview The Astromania 1.25" O-III Filter is a high-grade narrowband telescope accessory designed to isolate the double ionized oxygen emission lines (496-501nm), dramatically enhancing contrast and visibility of faint planetary and diffuse nebulae. Featuring anti-reflection and dichroic coatings, it fits all standard 1.25-inch telescope eyepieces and excels in both light-polluted and dark sky conditions, making it an essential tool for serious amateur astronomers and astrophotographers. ## Description The Astromania 1.25" O-III Filter is comparable to the Astromania UHC filter in its function. The difference is that this filter only allows the light of doubly ionized oxygen through. This means that there is an enormous increase in contrast with diffuse, planetary and extremely dim nebulae. This is a special narrowband filter which allows an even smaller range of wavelengths than the Astromania UHC filter. Even so, there are innumerable astronomical objects which can be first observed in detail with this filter or cannot be seen at all without it. A prime example is the Veil nebula in the constellation of Cygnus. It's a great accessory for observations of nebulae due to its capability to suppress all light that lies outside its 4960-5010 angstrom (496-501 nm) passband. This filter can be used for astrophotography as well. The O-III 1.25" Filter has a standart barrel diameter so you can use it with a telescope of any brand. Note that this filter gives a green tint to observed objects. The O-III provides an even greater contrast boost on some objects than the UltraBlock narrowband filter. And for nebulas, every little bit helps! It substantially improves contrast and outperforms the UHC for most planetary nebulae while on apertures of 10" or more, it outperforms the UHC filter for all types of nebulae. The Astromania 1.25" O-III Filter isolates just the two doubly ionized oxygen lines (496 and 501nm lines) emitted by diffuse, planetary and extremely faint nebulae. Thus, these faint objects become much more visible against the blackened background of space. The Astromania 1.25" O-III Filter produces near-photographic views of the Veil, Ring, Dumbbell and Orion nebula, among many other objects. Performs well under both light-polluted and dark skies. ## Features - 1.25 inch O-III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky condition; allows high-contrast imaging even in areas with strong light pollution - Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming; allowing just for the Double Ionized Oxygen lines between 496nm to 501nm to pass through at 95 percent - Completely blocks virtually all other visible wavelengths of light so views of nebulas are optimized; increases contrast through selective filtration-Anti-reflection coated to prevent glaring and ghosting - Not only useful at light-polluted sites; the contrast is also increased at dark sky sites; can be used with all 1.25 inch eyepieces; filter made from high-grade glass with dichroic interference and antireflection coatings - Each Astromania 1.25inch O-III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O-III emission lines ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0141U979O | | Brand Name | Astromania | | Coating Description | Antireflection Coating | | Colour | 1.25" O-III | | Compatible Devices | Telescopes with 1.25 inch filter threads | | Customer Reviews | 4.4 4.4 out of 5 stars (94) | | Enclosure Material | Glass | | Item Dimensions L x W | 32L x 32W millimetres | | Item Weight | 0.3 Ounces | | Manufacturer | Astromania | | Manufacturer Part Number | SKU_AM_OF1 | | Media Type | ProductImage | | Model Number | SKU_AM_OF1 | | Number of Items | 1 | | Photo Filter Effect Type | Enhancing | | Photo Filter Size | 31.75 Millimeters | | Photo Filter Thread Size | 31.75 Millimetres | | Screen Size | 1.25 Inches | | Set Name | 1.25 Inch O-III Filter Set | | Water Resistance Level | Not Water Resistant | ## Product Details - **Brand:** Astromania - **Coating description:** Antireflection Coating - **Material:** Glass - **Number of items:** 1 - **Photo Filter Size:** 31.75 Millimeters - **Photo filter effect type:** Enhancing - **Photo filter thread size:** 31.75 Millimetres - **Product dimensions:** 32L x 32W millimetres - **Water resistance level:** Not Water Resistant ## Images ![Astromania O-III Filter 1.25inch Telescope Filter Narrowband Nebula Filters - Image 1](https://m.media-amazon.com/images/I/71+VANg7S8L.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - Astromania 1.25" O-III Filter - Enhances Contrast During Visual Observation of Gaseous and Planetary Nebulae in All Sky Conditions, The Veil, Ring, Dumbbell and Orion Nebula, Among Many Other Objects - Astromania 1.25" UHC (Ultra High Contrast) Filter - Superb Views of The Orion, Lagoon, Swan and Other Extended Nebulae - Astromania 1.25" H-Alpha Night Sky Filter --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/218266086-astromania-o-iii-filter-1-25inch-telescope-filter-narrowband-nebula](https://www.desertcart.hr/products/218266086-astromania-o-iii-filter-1-25inch-telescope-filter-narrowband-nebula) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-23*