{"product_id":"filtro-pro-veil-h-alpha-oiii-7nm-2","title":"Pro Veil H-Alpha OIII 7nm 2'' Filter","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cb\u003eHidden in the light: the colours of the emission nebula\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eIn and around human settlements, there are a lot of lights. This illumination not only helps people find their way in the dark, but it also lights up the sky. Faint celestial objects disappear, hidden by the artificial brightness of the sky.\u003c\/p\u003e\n\u003cp\u003eUnlike stellar objects such as globular clusters and galaxies, or reflection nebulae such as the blue glow around the Pleiades, emission nebulae emit their light in very specific colours. 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 colours.\u003c\/p\u003e\n\u003cp\u003eHigh-performance nebula filters, such as Omegon Veil nebula filters, suppress artificial lighting, but allow the colours of the nebulae to pass through. In this way, faint emission nebulae, such as the Cirrus Nebula or the North America Nebula, can also be observed outside the desert or high mountains.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Omegon","offers":[{"title":"Default Title","offer_id":53581586956631,"sku":"82000","price":239.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/6198\/6860\/files\/82000_1.jpg?v=1779016097","url":"https:\/\/astrotelescopios.com\/en-eu\/products\/filtro-pro-veil-h-alpha-oiii-7nm-2","provider":"Astro Telescopios","version":"1.0","type":"link"}