{"product_id":"celestron-oxygen-iii-narrowband-filter-2","title":"Celestron 2\" Oxygen III Narrowband Filter","description":"\u003ch2\u003e\u003cstrong\u003eCelestron 2” OIII Narrowband Filter\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eReveal the Hidden Structure of Emission Nebulae\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eCelestron 2” OIII (Oxygen-III) Narrowband Filter\u003c\/strong\u003e is an advanced optical tool designed to isolate only the \u003cstrong\u003etwo key doubly-ionised oxygen emission lines (496nm and 501nm)\u003c\/strong\u003e—critical wavelengths produced by many \u003cstrong\u003eplanetary and emission nebulae\u003c\/strong\u003e. By filtering out the rest of the visible spectrum, this premium filter delivers \u003cstrong\u003eexceptional contrast and clarity\u003c\/strong\u003e, even under light-polluted skies.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eEnhance Nebula Viewing Like Never Before\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOptimised for key targets\u003c\/strong\u003e such as the \u003cstrong\u003eVeil, Ring, Dumbbell, Crescent, and Orion Nebulae\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCreates a \u003cstrong\u003edeep black background\u003c\/strong\u003e, dramatically improving visibility of faint OIII structures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIdeal for both \u003cstrong\u003evisual observation\u003c\/strong\u003e and \u003cstrong\u003eastrophotography\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePrecision-Engineered Coatings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eFeatures an \u003cstrong\u003eultra-hard, vacuum-deposited multilayer coating\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBlocks the entire visual spectrum from \u003cstrong\u003e400 to 700nm\u003c\/strong\u003e, except the two OIII lines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMinimises or eliminates \u003cstrong\u003eunwanted halos\u003c\/strong\u003e around bright stars—common in filters with less refined coating technologies\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned to maintain optical quality without introducing distortions or colour shifts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDurable, High-Quality Build\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHoused in a \u003cstrong\u003erobust 2-inch anodised metal cell\u003c\/strong\u003e compatible with standard 2” filter threads\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eBuilt to withstand years of use in the field\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you’re looking to reveal subtle details in emission nebulae and cut through the glare of urban skies or moonlight, the \u003cstrong\u003eCelestron 2” OIII Narrowband Filter\u003c\/strong\u003e is an essential addition to your optical toolkit.\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":55897340969334,"sku":"050234936248","price":139.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2235\/3014\/files\/Celestron-Oxygen-III-Narrowband-Filter-2_-93624-CGL.jpg?v=1766071880","url":"https:\/\/welshastronomy.co.uk\/products\/celestron-oxygen-iii-narrowband-filter-2","provider":"The Welsh Astronomy Centre","version":"1.0","type":"link"}