{"product_id":"sky-watcher-2-inch-ultra-high-contrast-uhc-filter-for-telescope-20197","title":"Sky-Watcher 2\" Ultra High Contrast (UHC) Filter","description":"\u003ch2\u003eSky-Watcher 2\" Ultra High Contrast (UHC) Filter - 20197\u003c\/h2\u003e\n\u003cp\u003eThe Sky-Watcher 2\" Ultra High Contrast (UHC) Filter is a highly effective dark-sky nebula filter designed to enhance faint deep-sky targets while reducing the effects of light pollution. Ideal for visual observing with telescopes equipped with a 2\" eyepiece holder, it delivers dramatically improved contrast on many popular emission and planetary nebulae.\u003c\/p\u003e\n\u003ch3\u003eBring out detail in faint nebulae\u003c\/h3\u003e\n\u003cp\u003eBy selectively transmitting key wavelengths of light while blocking much of the background glow, the UHC filter helps reveal subtle structures that are often washed out under suburban skies. It performs particularly well on objects such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOrion Nebula (M42)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLagoon Nebula (M8)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSwan \/ Omega Nebula (M17)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMany other extended emission nebulae\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBecause the UHC filter allows slightly more light through than stricter O-III filters, it is especially useful on \u003cstrong\u003esmaller-aperture telescopes\u003c\/strong\u003e, where brightness is at more of a premium.\u003c\/p\u003e\n\u003ch3\u003eNarrowband performance\u003c\/h3\u003e\n\u003cp\u003eThis narrowband UHC filter isolates:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eThe two \u003cstrong\u003edoubly ionised oxygen (O-III) lines\u003c\/strong\u003e at 496nm and 501nm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThe \u003cstrong\u003eHydrogen-Beta (H-β) line\u003c\/strong\u003e at 486nm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBlocking much of the unwanted artificial light, it increases contrast without overly dimming the target.\u003c\/p\u003e\n\u003cp\u003eSupplied in a protective storage case, the Sky-Watcher 2\" Ultra High Contrast Filter is an excellent all-round nebula filter — an ideal addition for observers wanting to see more structure and detail in deep-sky objects from less-than-perfect skies.\u003c\/p\u003e","brand":"SkyWatcher","offers":[{"title":"Default Title","offer_id":57010352128374,"sku":"5055534800300","price":59.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2235\/3014\/files\/1_136_52_8abc5745-bf64-4be4-bcd4-d59214534053.jpg?v=1767793739","url":"https:\/\/welshastronomy.co.uk\/products\/sky-watcher-2-inch-ultra-high-contrast-uhc-filter-for-telescope-20197","provider":"The Welsh Astronomy Centre","version":"1.0","type":"link"}