{"product_id":"sv132-2-inch-25nm-h-beta-astronomical-nebula-filter-w9102b","title":"SV132 2-inch 25nm H-Beta Astronomical Nebula Filter W9102B","description":"\u003cdiv id=\"offer-template-0\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe H-Beta filter is a narrowband filter designed specifically for visual inspection. It mainly targets the 486nm (blue) spectral nebula. Filtering out interference from other light sources can improve the contrast of the nebula. When observing visually, in order to see a sufficiently dark nebula, it is necessary to ensure a sufficiently large luminous flux and use a large aperture telescope for observation. It is not recommended to use a small aperture telescope for observation. The hydrogen beta line with a center wavelength of 486nm in H-Beta is suitable for observing the Horsehead Nebula and California Nebula in Orion, which are difficult to capture. By using a filter, the Horsehead Nebula can be clearly seen. Filter 2 with metal bracket filter thread; Threaded to fit 2 eyepieces and threaded diagonal barrels\u003cbr\u003eSpecifications:\u003cbr\u003e1. Brand: SVBONY\u003cbr\u003e2. Model: SV132\u003cbr\u003e3. Type: H-Beta\u003cbr\u003e4. Size: 2 inches\u003cbr\u003e5. Substrate: B270\u003cbr\u003e6. Substrate thickness: 1.85mm\u003cbr\u003e7. Wavelength range: 400-700nm\u003cbr\u003e8.CWL:486nm±2nm\u003cbr\u003e9. Half width: 25nm ± 2nm\u003cbr\u003e10. T peak: 90%\u003cbr\u003e11. Blocking: OD3 @ 300-1100nm\u003cbr\u003e12. Aperture: 44mm\u003cbr\u003e13. Surface quality: 60\/40\u003cbr\u003e14. Surface parallelism: 1\/4 λ\u003cbr\u003e15. Parallelism: 30\u003cbr\u003e16. Net weight: 13.2g\/0.47oz\u003cbr\u003eThe package includes:\u003cbr\u003eSVBONY 2 H-Beta 25nm filter\u003cbr\u003eDurable plastic casing\u003c\/p\u003e","brand":"mickcara","offers":[{"title":"1111","offer_id":42971623522441,"sku":"56d10c","price":133.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0365\/2131\/2393\/files\/59c329eec93f682a8d64ab4ed831beb8.jpg?v=1726040233","url":"https:\/\/mickcara.com\/products\/sv132-2-inch-25nm-h-beta-astronomical-nebula-filter-w9102b","provider":"mickcara","version":"1.0","type":"link"}