{"product_id":"filtro-pro-veil-oiii-7nm-2","title":"Pro Veil OIII 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 great amount of light. This illumination not only helps people navigate in the dark, but it also illuminates 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 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 human eye's poor red sensitivity, a camera can capture all colors.\u003c\/p\u003e\n\u003cp\u003eHigh-performance nebula filters, such as 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\u003eOIII filters\u003c\/b\u003e only let light with a wavelength of 501 nanometers pass through, which corresponds to the spectral line of \u003cb\u003edoubly ionized oxygen\u003c\/b\u003e. This line is emitted by planetary nebulae and some emission nebulae, so that with this filter these objects remain visible while the filter blocks the rest. This effect increases contrast and makes faint nebulae visible.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAstro-photography:\u003c\/b\u003e The best results are achieved with this filter and monochrome cameras. Ideally, this filter should be combined with H-alpha and SII. This results in an image that shows delicate nebular structures with clarity and high contrast.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Omegon","offers":[{"title":"Default Title","offer_id":53581587153239,"sku":"82010","price":239.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/6198\/6860\/files\/82010_1.jpg?v=1779016104","url":"https:\/\/astrotelescopios.com\/en-eu\/products\/filtro-pro-veil-oiii-7nm-2","provider":"Astro Telescopios","version":"1.0","type":"link"}