{"product_id":"filtro-pro-veil-oiii-3nm-2","title":"Pro Veil OIII 3nm 2'' Filter","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cb\u003eHidden in the Light: The Colors of Emission Nebulae\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eIn and around human settlements, there are many lights. This lighting not only helps people find their way in the dark, but it also brightens the sky. Faint celestial objects disappear, hidden by the artificial skyglow.\u003c\/p\u003e\n\u003cp\u003eUnlike stellar objects like globular clusters and galaxies, or reflection nebulae such as the blue glow around the Pleiades, emission nebulae emit their light in very specific colors. The brightest of these so-called emission lines are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eH-Alpha: 656.3 nm\u003c\/li\u003e\n\u003cli\u003eH-Beta: 486.1 nm\u003c\/li\u003e\n\u003cli\u003eO-III_1: 495.9 nm\u003c\/li\u003e\n\u003cli\u003eO-III_2: 500.7 nm\u003c\/li\u003e\n\u003cli\u003eS-II_1: 671.7 nm\u003c\/li\u003e\n\u003cli\u003eS-II_2: 673.1 nm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhile only the O-III and H-beta lines can be distinguished with the naked eye due to the low red sensitivity of the human eye, a camera can capture all colors.\u003c\/p\u003e\n\u003cp\u003eHigh-performance nebula filters, such as the Omegon Veil nebula filters, suppress artificial light but allow the colors of nebulae to pass through. This way, faint emission nebulae, such as the Cirrus nebula or the North America nebula, can also be observed outside of deserts or high mountains.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eNarrowband Filter for OIII Lines at 495.9 \u0026 500.7 nm\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eThis filter is suitable for observing and photographing OIII regions from areas with artificial light pollution or dark sky areas.\u003cbr\u003e\u003cbr\u003eThe OIII filter increases the contrast between certain types of astronomical objects (mainly supernova remnants and planetary nebulae) and the sky background. Thanks to its \u003cb\u003enarrow bandwidth\u003c\/b\u003e and \u003cb\u003ehigh transmission\u003c\/b\u003e in the OIII line range, it achieves a higher contrast increase than filters with a wider bandwidth. Its range of application extends from an aperture ratio of 1:3 to 1:15 for telescopes from 6\" (150 mm) aperture for observation with medium magnification, and objectives and telescopes of all diameters for astrophotography.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOperating Principle\u003c\/b\u003e\u003cbr\u003eThe filter completely blocks the emission lines of low and high-pressure lamps (mercury (Hg) and sodium (Na)) and the lines of atmospheric glow. The two OIII lines can pass through the filter with very high transmission.\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Omegon","offers":[{"title":"Default Title","offer_id":53581587120471,"sku":"82014","price":290.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/6198\/6860\/files\/82014_1.jpg?v=1779016103","url":"https:\/\/astrotelescopios.com\/en-uk\/products\/filtro-pro-veil-oiii-3nm-2","provider":"Astro Telescopios","version":"1.0","type":"link"}