--- product_id: 20883930 title: "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" brand: "astromania" price: "€ 103.30" currency: EUR in_stock: true reviews_count: 9 category: "Astromania" url: https://www.desertcart.de/products/20883930-1-25-o-iii-filter-enhances-contrast-during-visual-observation store_origin: DE region: Germany --- # 95% O-III light transmittance 1.25" precision fit Blocks all other visible wavelengths 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 **Brand:** astromania **Price:** € 103.30 **Availability:** βœ… In Stock ## Summary > 🌠 See the unseen: Unlock nebula secrets with Astromania’s O-III filter! ## Quick Answers - **What is this?** 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 by astromania - **How much does it cost?** € 103.30 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/20883930-1-25-o-iii-filter-enhances-contrast-during-visual-observation) ## 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€’ **Trusted & Tested:** Individually inspected with transmittance rating for guaranteed performance - β€’ **Anti-Reflection Coating:** Eliminates glare and ghosting for sharper, cleaner observations - β€’ **Universal Compatibility:** Fits all 1.25" eyepieces for seamless integration with your telescope - β€’ **Selective Oxygen Bandpass:** Filters only 496-501nm double ionized oxygen lines for stunning detail - β€’ **Crystal-Clear Nebula Views:** Maximize contrast on gaseous & planetary nebulae even under city lights ## Overview The Astromania 1.25" O-III Filter is a high-grade optical accessory designed to enhance contrast and detail in visual observations of gaseous and planetary nebulae. By selectively transmitting 95% of the double ionized oxygen emission lines (496-501nm) and blocking nearly all other visible light, it dramatically improves nebula visibility even in light-polluted skies. Its anti-reflection coatings reduce glare and ghosting, and it fits all standard 1.25" eyepieces, making it a versatile and reliable tool for amateur astronomers seeking professional-grade views. ## Description desertcart.com : 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 : Electronics Review: Don't be fooled by cheap price - I'm a hardcore deep sky veteran now on my 5th scope, an 18-inch Dobsonian. On a whim, I decided I needed a filter with an even tighter bandwidth than a UHC (ultra high contrast) filter to try on the Vela Supernova Remnant from the ultra-dark skies of Big Bend National Park, Texas. I was afraid to get this one because of its low price but I was on a budget and in a hurry. I'm glad I got it. It worked. Freezing my tail off at 3 in the morning on a cold, crystal clear November night I got the view I wanted. It was a disappointment on any object that shines brightest in hydrogen light, but if you know what nebulas shine in oxygen III light like the Veil, get this filter. You'll be glad you did. Review: Great Value Nebula Filter from AstroMania - The AstroMania 2" O-III Filter is a great value! Packaging/Shipping: I was once again very impressed with how well AstroMania did packaging this filter. I've included some pictures from the unpacking process showing how securely it was packaged. Shipping information was sent to me by AstroMania and the package came in within the time frame given. The filter itself comes in a very nice plastic case that is even better than what I has come with other more-expensive filters. Since this is the only O-III filter I have, I wasn't able to compare it visually to other branded filters, so I instead compared it to UHC filters (one from Astromania, another from DGM Optics). The AstroMania filter easily threaded onto my eyepieces with no problems. My observing location was near a large city, so there was some light pollution, but I drove about 40 miles North of the city to a spot where I was just getting the Milky Way naked-eye overhead. It was about 4am CST with no moon, 70 degrees and average seeing/transparency. I was using my Orion SkyQuest XT12G with 82 degree Explore Scientific eyepieces. I looked at the following objects during my testing: NGC 6960 Veil Nebula - Wow!! The Veil Nebula is unbelievable using an O-III filter. I was literally walking around the Veil nebula North and South pieces and couldn't believe the details that were brought out with this filter. The central piece was not seen, but I chalked this up largely to the sky conditions where I was (not great) and that the central area has a much lower surface brightness and is hard to see. The UHC filters couldn't compare to the O-III on this object, but they did bring out the visibility over no filter at all. M57 Ring Nebula - While there were some differences visible with the O-III over no filter at all, the UHC filters really stood out on this object. NGC 6543 Cat's Eye Nebula - This was one of the objects that definitely stood out with the O-III over the UHC filters. While this object is pretty small, the detail and color really stood out and was greatly enhanced with this filter. While I've seen this object in the past without a filter, I really wanted to spend time studying it with the O-III. M27 Dumbbell Nebula - The Dumbbell nebula, while much better with the UHC filters, was greatly enhanced by the O-III filter and gave a wonderful view versus no filter at all. My conclusion after using the O-III filter from AstroMania was that if you want greatly enhanced views of many, many nebulae in the sky, this filter will do the job and then some, at a very reasonable price. Some very experienced or professional observers might opt for something that brings out more detail, but with that comes a much higher price. I was very impressed, once again, with the product AstroMania put out. ## 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 | | Best Sellers Rank | #15 in Telescope Filters | | Customer Reviews | 4.4 4.4 out of 5 stars (144) | | Date First Available | August 18, 2015 | | Is Discontinued By Manufacturer | No | | Item Weight | 0.3 ounces | | Item model number | SKU_AM_OF1 | | Manufacturer | Astromania | | Product Dimensions | 2.14 x 1.74 x 0.74 inches | ## Product Details - **Brand:** Astromania - **Coating Description:** Multi Coating - **Material:** Glass - **Photo Filter Effect Type:** Enhancing - **Photo Filter Size:** 31.75 Millimeters - **Photo Filter Thread Size:** 3.2 Centimeters - **Product Dimensions:** 1.25"L x 1.25"W - **Set Name:** 1.25 Inch O-III Filter Set - **Water Resistance Level:** Not Water Resistant ## Images ![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 - Image 1](https://m.media-amazon.com/images/I/71+VANg7S8L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Don't be fooled by cheap price *by D***G on February 23, 2020* I'm a hardcore deep sky veteran now on my 5th scope, an 18-inch Dobsonian. On a whim, I decided I needed a filter with an even tighter bandwidth than a UHC (ultra high contrast) filter to try on the Vela Supernova Remnant from the ultra-dark skies of Big Bend National Park, Texas. I was afraid to get this one because of its low price but I was on a budget and in a hurry. I'm glad I got it. It worked. Freezing my tail off at 3 in the morning on a cold, crystal clear November night I got the view I wanted. It was a disappointment on any object that shines brightest in hydrogen light, but if you know what nebulas shine in oxygen III light like the Veil, get this filter. You'll be glad you did. ### ⭐⭐⭐⭐⭐ Great Value Nebula Filter from AstroMania *by C***T on July 24, 2016* The AstroMania 2" O-III Filter is a great value! Packaging/Shipping: I was once again very impressed with how well AstroMania did packaging this filter. I've included some pictures from the unpacking process showing how securely it was packaged. Shipping information was sent to me by AstroMania and the package came in within the time frame given. The filter itself comes in a very nice plastic case that is even better than what I has come with other more-expensive filters. Since this is the only O-III filter I have, I wasn't able to compare it visually to other branded filters, so I instead compared it to UHC filters (one from Astromania, another from DGM Optics). The AstroMania filter easily threaded onto my eyepieces with no problems. My observing location was near a large city, so there was some light pollution, but I drove about 40 miles North of the city to a spot where I was just getting the Milky Way naked-eye overhead. It was about 4am CST with no moon, 70 degrees and average seeing/transparency. I was using my Orion SkyQuest XT12G with 82 degree Explore Scientific eyepieces. I looked at the following objects during my testing: NGC 6960 Veil Nebula - Wow!! The Veil Nebula is unbelievable using an O-III filter. I was literally walking around the Veil nebula North and South pieces and couldn't believe the details that were brought out with this filter. The central piece was not seen, but I chalked this up largely to the sky conditions where I was (not great) and that the central area has a much lower surface brightness and is hard to see. The UHC filters couldn't compare to the O-III on this object, but they did bring out the visibility over no filter at all. M57 Ring Nebula - While there were some differences visible with the O-III over no filter at all, the UHC filters really stood out on this object. NGC 6543 Cat's Eye Nebula - This was one of the objects that definitely stood out with the O-III over the UHC filters. While this object is pretty small, the detail and color really stood out and was greatly enhanced with this filter. While I've seen this object in the past without a filter, I really wanted to spend time studying it with the O-III. M27 Dumbbell Nebula - The Dumbbell nebula, while much better with the UHC filters, was greatly enhanced by the O-III filter and gave a wonderful view versus no filter at all. My conclusion after using the O-III filter from AstroMania was that if you want greatly enhanced views of many, many nebulae in the sky, this filter will do the job and then some, at a very reasonable price. Some very experienced or professional observers might opt for something that brings out more detail, but with that comes a much higher price. I was very impressed, once again, with the product AstroMania put out. ### ⭐⭐⭐⭐ be aware this does not block IR *by A***R on October 16, 2024* The published spectral transmission plot shows only the visible light range. If you're using this on a monochrome camera without an IR-block filter, be aware this filter does not attenuate IR very much, in fact it has more transmission at 840 and 920 nm than it does in the nominal passband of 500-520 nm. Attached plot of absorbance was taken with an Ocean Optics USB2000 spectrometer. ## 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.de/products/20883930-1-25-o-iii-filter-enhances-contrast-during-visual-observation](https://www.desertcart.de/products/20883930-1-25-o-iii-filter-enhances-contrast-during-visual-observation) --- *Product available on Desertcart Germany* *Store origin: DE* *Last updated: 2026-04-24*