{"product_id":"chroma-5nm-h-beta-filter","title":"Chroma 5nm H-Beta Filter","description":"\u003ch2\u003eChroma 5nm H-beta Filter\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eH-beta filters are also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrow-band filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003cbr\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or “back reflections”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Chroma 5nm H-beta Filter is also useful for imaging nebulae and objects rich in ionized hydrogen. At 486.1nm, a narrowband filter is required to separate H-beta from nearby blue and green spectral lines. Although weaker than the H-alpha line, this is often used for visual detection as the longer red wavelengths of H-alpha are difficult to detect by eye. Chroma Technology is an employee-owned company. They specialize in the design and manufacture of sputtered optical filters and coatings for applications that require the greatest precision in color separation, optical quality and signal purity. Their astronomical filters are used worldwide in research and amateur applications. They are as comfortable designing and manufacturing custom filters as they are for their catalog items. Highly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. Chroma provides custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request. Chroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission. All filters are manufactured in Vermont.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cspan\u003eDurable sputter coatings\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eParallelism: \u0026lt;30 arcsec\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThickness: 3.0 +\/-0.05mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\u003cspan\u003eChroma 5nm H-beta Filter of the chosen size\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eLifetime Warranty for Sputtered Catalog Filters\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25″ round mounted","offer_id":43647863095525,"sku":"CHR-27005-1.25","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"2″ round mounted","offer_id":43647863128293,"sku":"CHR-27005-2","price":1365.0,"currency_code":"CAD","in_stock":true},{"title":"31mm round unmounted","offer_id":43647863161061,"sku":"CHR-27005-31","price":644.0,"currency_code":"CAD","in_stock":true},{"title":"36mm round unmounted","offer_id":43647863193829,"sku":"CHR-27005-36","price":868.0,"currency_code":"CAD","in_stock":true},{"title":"50mm round unmounted","offer_id":43647863226597,"sku":"CHR-27005-50","price":1295.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm square unmounted","offer_id":43647863259365,"sku":"CHR-27005-50S","price":1932.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/chroma-5nm-h-beta-filter-astronomy-plus-1.webp?v=1690483357","url":"https:\/\/istronomyplus.com\/products\/chroma-5nm-h-beta-filter","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}