{"product_id":"explore-scientific-h-beta-narrowband-filter-310230","title":"Explore Scientific H-Beta Narrowband Filter - 2\" - 310230","description":"\u003ch3 style=\"text-align: center;\"\u003eExplore Scientific H-Beta Filter 2\"\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNarrowband Filter for H-Beta sources\u003c\/li\u003e\n\u003cli\u003eUseful where you do not have a dark-sky site\u003c\/li\u003e\n\u003cli\u003eObserve deep-sky nebulae from brighter areas\u003c\/li\u003e\n\u003cli\u003eIncrease contrast of deep-sky objects\u003c\/li\u003e\n\u003cli\u003eRange: 478 nm to 496 nm; peaks at 489 nm\u003c\/li\u003e\n\u003cli\u003e94.5% Transmission\u003c\/li\u003e\n\u003cli\u003eFits 2\" Eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis is a stray light reduction filter which fits into your 2\" eyepieces that have internal (female) filter threads. The Explore Scientific Narrowband H-Beta Filter 2\" is designed for observing deep sky objects which glow in H-Beta light, and it is tuned specifically to pass the H-beta wavelength band of light. Hydrogen is the most abundant element in the Universe and many nebulae glow in the H-beta light. The H-Beta Narrowband Filter 2\" from Explore Scientific does a good job of increasing contrast, providing a darker sky background. It does this by filtering out all the other wavelengths of light, while allowing the light from H-Beta nebulae or other sources to pass through so you can see them better. It has a total transmission specification of 94.5%.\u003c\/p\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":16329130049,"sku":"EXP-310230","price":161.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/0310230_M.jpg?v=1776458896","url":"https:\/\/khanscope.com\/en-fr\/products\/explore-scientific-h-beta-narrowband-filter-310230","provider":"Khan Scope Centre","version":"1.0","type":"link"}