{"product_id":"sky-watcher-2-light-pollution-filter-for-use-on-smaller-telescopes","title":"Sky-Watcher 2\" Light Pollution Filter","description":"\u003ch2\u003eSky-Watcher 2\" Light Pollution Filter - 20199\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher 2\" Light Pollution Filter is designed to significantly improve contrast when observing from suburban or urban locations. By selectively blocking common artificial light wavelengths while allowing key astronomical emissions to pass through, it helps reveal faint nebulae and subtle details that are otherwise washed out by skyglow.\u003c\/p\u003e\n\u003cp\u003eHoused in a durable anodised aluminium cell, the filter simply threads into standard \u003cstrong\u003e2\" eyepieces\u003c\/strong\u003e or accessories and is supplied in a protective storage case.\u003c\/p\u003e\n\u003ch3\u003eReduce skyglow, enhance contrast\u003c\/h3\u003e\n\u003cp\u003eThis filter is engineered to suppress the glow from \u003cstrong\u003emercury-vapour and other street lighting\u003c\/strong\u003e, while preserving high transmission at important astronomical wavelengths. The result is darker backgrounds and improved separation between the target and the surrounding sky.\u003c\/p\u003e\n\u003cp\u003eIt is particularly effective on emission nebulae, where light is emitted in narrow wavelength bands.\u003c\/p\u003e\n\u003ch3\u003eOptimised wavelength transmission\u003c\/h3\u003e\n\u003cp\u003eThe Sky-Watcher Light Pollution Filter allows strong transmission of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHydrogen-Alpha (H-α)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHydrogen-Beta (H-β)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoubly ionised oxygen (O-III)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis improves views of nebulae, and can give modest enhancement to galaxies, clusters and planetary detail (especially reddish features), though the effect is most dramatic on nebulae.\u003c\/p\u003e\n\u003ch3\u003eIdeal for smaller telescopes\u003c\/h3\u003e\n\u003cp\u003eWhile compatible with telescopes of all apertures, this filter is particularly recommended for \u003cstrong\u003esmaller instruments up to around 114mm\u003c\/strong\u003e, where more aggressive filters may remove too much light.\u003c\/p\u003e\n\u003ch3\u003eKey details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSize:\u003c\/strong\u003e 2\" (threads to standard 2\" eyepieces)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Contrast-enhancing light pollution filter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Optical glass in anodised aluminium cell\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMPN:\u003c\/strong\u003e 20199\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Sky-Watcher 2\" Light Pollution Filter is a valuable accessory for observers dealing with light-polluted skies — helping you see more structure and contrast in nebulae and other deep-sky objects.\u003c\/p\u003e","brand":"SkyWatcher","offers":[{"title":"Default Title","offer_id":57010354389366,"sku":"5055534800324","price":33.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2235\/3014\/files\/Sky-Watcher-2-Light-Pollution-Filter-20199_0d5a42c6-65be-409d-b78b-a3d8e4cc61ed.webp?v=1768403284","url":"https:\/\/welshastronomy.co.uk\/products\/sky-watcher-2-light-pollution-filter-for-use-on-smaller-telescopes","provider":"The Welsh Astronomy Centre","version":"1.0","type":"link"}