{"product_id":"filtro-pro-veil-sii-7nm-2","title":"Pro Veil SII 7nm 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 is a plethora of lights. This illumination 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 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 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 O-III and H-beta lines can be distinguished with the naked eye due to the human eye's poor red sensitivity, a camera can capture all colors.\u003c\/p\u003e\n\u003cp\u003eHigh-performance nebula filters, such as the Omegon Veil nebula filters, suppress artificial lighting but let the colors of the nebulae pass through. 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\u003cp\u003e\u003cb\u003eSII filter:\u003c\/b\u003e the narrow-band filter lets light from ionized sulfur atoms pass at \u003cb\u003e671.7 and 673.1 nanometers\u003c\/b\u003e. These are the lines in which many planetary nebulae, emission nebulae, and supernova remnants shine.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAstrophotography:\u003c\/b\u003e it is best to use monochrome cameras. Ideally, combine the capture with SII, OIII, and H-Alpha filters. The result is an image that shows the delicate structures of the nebula with high contrast and great sharpness.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Omegon","offers":[{"title":"Default Title","offer_id":53581587480919,"sku":"82011","price":211.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/6198\/6860\/files\/82011_1.jpg?v=1779016115","url":"https:\/\/astrotelescopios.com\/en-uk\/products\/filtro-pro-veil-sii-7nm-2","provider":"Astro Telescopios","version":"1.0","type":"link"}