{"product_id":"celestron-ha-hb-oiii-imaging-filter-rowe-ackermann-8-astrograph-93619","title":"Celestron Ha-Hb-OIII Imaging Filter - Rowe-Ackermann 8 Astrograph - 93619","description":"\u003ch3 style=\"text-align: center;\"\u003eCelestron Ha-Hb-OIII Imaging Filter - Rowe-Ackermann 8 Astrograph\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis is a Celestron Ha-Hb-OIII Imaging Filter for the Rowe-Ackermann 8 (RASA) Astrograph\u003c\/li\u003e\n\u003cli\u003eEnhance imaging of nebulae with your 8” Rowe-Ackermann Schmidt Astrograph by blocking light pollution, improving image contrast, and darkening the sky background\u003c\/li\u003e\n\u003cli\u003eThis filter transmits only the key Hα-Hβ-OIII wavelengths from emission nebulae, providing high contrast that yields better images\u003c\/li\u003e\n\u003cli\u003eThis filter selectively blocks wavelengths of light from sources of light polluted skies and natural sky glow\u003c\/li\u003e\n\u003cli\u003eUnlike similar filters with narrower bandpasses, this filter was engineered specifically to work with RASA’s fast f\/2 optics\u003c\/li\u003e\n\u003cli\u003eFits into the 8” RASA’s integrated filter mount, maintaining peak optical performance\u003c\/li\u003e\n\u003cli\u003eOptically flat surfaces free of defects, made with Schott glass with anti-reflection coatings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Celestron Ha-Hb-OIII Imaging Filter made especially for the Rowe-Ackermann 8 (RASA) Astrograph will let you bring out the best in your nebulae astroimages with the H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter. This specialized filter allows high transmission of light from emission nebulae while blocking light pollution, helping to make your images appear with better detail off the black sky background with superior contrast.\u003c\/p\u003e\n\u003cp\u003eThis Imaging Filter takes advantage of the fact that many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these “bad” wavelengths, the filter essentially eliminates the effect of light pollution while letting the “good” wavelengths of light associated with the emission nebula pass through to a camera. You’ll notice much higher contrast in your images immediately, even if imaging from your light polluted backyard! And since the transmission at the key wavelengths you want to image from nebulae is so high, the nebulae will not be dimmed—but the unwanted background will be blacker.\u003c\/p\u003e\n\u003cp\u003eThe Hα-Hβ-OIII Imaging Filter for the 8” RASA is perfect for imaging emission nebulae like the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42), and the Carina Nebula (NGC 3372). The imaging filter transmits key Hα-Hβ-OIII wavelengths which are most common from the celestial emission nebulae, and that will then produce high contrast for emission nebulae.\u003c\/p\u003e\n\u003cp\u003eNOTE: The transmission for the Hα-Hβ-OIII Imaging Filter is 85% or greater at key wavelengths (486 nm, 496 nm\/501 nm, 656 nm) and less than 0.5% transmission elsewhere. The Hα-Hβ-OIII Imaging Filter for the 8” RASA is a narrowband filter that blocks much of the visible spectrum and only allows those specific wavelengths through. Because of this, it will NOT work well on broadband emission objects, such as galaxies and star clusters.\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer:\u003c\/td\u003e\n\u003ctd\u003eCelestron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMfr. SKU:\u003c\/td\u003e\n\u003ctd\u003e93619\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction:\u003c\/td\u003e\n\u003ctd\u003eHa-Hb-OIII Imaging Filter for Rowe-Ackermann 8\" Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass type:\u003c\/td\u003e\n\u003ctd\u003eSchott B270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass thickness:\u003c\/td\u003e\n\u003ctd\u003e2 mm (0.078\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter diameter:\u003c\/td\u003e\n\u003ctd\u003e46 mm (1.81\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear aperture:\u003c\/td\u003e\n\u003ctd\u003e43 mm (1.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings:\u003c\/td\u003e\n\u003ctd\u003eDichroic multi-bandpass and multi-layer anti-reflection coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter cell:\u003c\/td\u003e\n\u003ctd\u003eAluminum, black anodized, with a knurled rim\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":39392244531313,"sku":"CEL-93619","price":294.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/93614_Light_Polution_Filter_RASA_8_01_570x380_3x_a59b815c-352e-46bc-9acd-c05138ca26f7.jpg?v=1776458928","url":"https:\/\/khanscope.com\/en-fr\/products\/celestron-ha-hb-oiii-imaging-filter-rowe-ackermann-8-astrograph-93619","provider":"Khan Scope Centre","version":"1.0","type":"link"}