{"product_id":"lunt-18mm-blocking-filter-2-in-star-diagonal-with-t2-connection","title":"Lunt Blocking Filters","description":"\u003ch2 data-start=\"0\" data-end=\"24\" style=\"text-align: center;\"\u003eLunt Blocking Filters\u003c\/h2\u003e\n\u003cul data-start=\"26\" data-end=\"1136\"\u003e\n\u003cli data-start=\"26\" data-end=\"186\"\u003e\n\u003cp data-start=\"28\" data-end=\"186\"\u003eThe \u003cstrong data-start=\"32\" data-end=\"61\"\u003erequired safety component\u003c\/strong\u003e for every Lunt H-alpha solar system—each blocking filter houses additional elements essential to safe, on-band performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"187\" data-end=\"343\"\u003e\n\u003cp data-start=\"189\" data-end=\"343\"\u003eAvailable in \u003cstrong data-start=\"202\" data-end=\"231\"\u003efour clear-aperture sizes\u003c\/strong\u003e—\u003cstrong data-start=\"232\" data-end=\"261\"\u003eB600, B1200, B1800, B3400\u003c\/strong\u003e—so you can match your use (visual or imaging) and your telescope’s focal length\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"344\" data-end=\"494\"\u003e\n\u003cp data-start=\"346\" data-end=\"494\"\u003eChoose your \u003cstrong data-start=\"358\" data-end=\"375\"\u003ehousing style\u003c\/strong\u003e to fit your workflow: \u003cstrong data-start=\"398\" data-end=\"432\"\u003e1.25\" or 2\" diagonal (with T2)\u003c\/strong\u003e, or \u003cstrong data-start=\"437\" data-end=\"492\"\u003e2\" straight-through extension tube (with T2 and 2\")\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"495\" data-end=\"665\"\u003e\n\u003cp data-start=\"497\" data-end=\"665\"\u003e\u003cstrong data-start=\"497\" data-end=\"519\"\u003eImaging made easy:\u003c\/strong\u003e most camera trains need extra back focus, so select the \u003cstrong data-start=\"576\" data-end=\"591\"\u003enext larger\u003c\/strong\u003e blocking filter than you would for visual to keep the full cone in-band\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"666\" data-end=\"827\"\u003e\n\u003cp data-start=\"668\" data-end=\"827\"\u003e\u003cstrong data-start=\"668\" data-end=\"690\"\u003eEngineered by Lunt\u003c\/strong\u003e with a unique internal filter stack; \u003cstrong data-start=\"728\" data-end=\"825\"\u003esafety and performance are warranted only when paired with a Lunt H-alpha filter or telescope\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"828\" data-end=\"982\"\u003e\n\u003cp data-start=\"830\" data-end=\"982\"\u003eWorks beautifully with Lunt modular scopes and etalon systems; simple, reliable path to crisp prominences, filaments, and high-contrast surface detail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"983\" data-end=\"1136\"\u003e\n\u003cp data-start=\"985\" data-end=\"1136\"\u003eQuick pick: select \u003cstrong data-start=\"1004\" data-end=\"1024\"\u003eB600\/B1200\/B1800\u003c\/strong\u003e from the options; the \u003cstrong data-start=\"1047\" data-end=\"1056\"\u003eB3400\u003c\/strong\u003e is available in a \u003cstrong data-start=\"1075\" data-end=\"1113\"\u003e2\" straight-through extension tube\u003c\/strong\u003e for long focal lengths\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-start=\"1138\" data-end=\"1154\"\u003eSpecifications\u003c\/h1\u003e\n\u003cul data-start=\"1155\" data-end=\"2058\"\u003e\n\u003cli data-start=\"1155\" data-end=\"1239\"\u003e\n\u003cp data-start=\"1157\" data-end=\"1239\"\u003e\u003cstrong data-start=\"1157\" data-end=\"1195\"\u003eAperture Options (clear aperture):\u003c\/strong\u003e \u003cstrong data-start=\"1196\" data-end=\"1204\"\u003eB600\u003c\/strong\u003e, \u003cstrong data-start=\"1206\" data-end=\"1215\"\u003eB1200\u003c\/strong\u003e, \u003cstrong data-start=\"1217\" data-end=\"1226\"\u003eB1800\u003c\/strong\u003e, \u003cstrong data-start=\"1228\" data-end=\"1237\"\u003eB3400\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1240\" data-end=\"1413\"\u003e\n\u003cp data-start=\"1242\" data-end=\"1257\"\u003e\u003cstrong data-start=\"1242\" data-end=\"1255\"\u003eHousings:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1260\" data-end=\"1413\"\u003e\n\u003cli data-start=\"1260\" data-end=\"1301\"\u003e\n\u003cp data-start=\"1262\" data-end=\"1301\"\u003e\u003cstrong data-start=\"1262\" data-end=\"1299\"\u003e1.25\" diagonal with T2 connection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1304\" data-end=\"1342\"\u003e\n\u003cp data-start=\"1306\" data-end=\"1342\"\u003e\u003cstrong data-start=\"1306\" data-end=\"1340\"\u003e2\" diagonal with T2 connection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1345\" data-end=\"1413\"\u003e\n\u003cp data-start=\"1347\" data-end=\"1413\"\u003e\u003cstrong data-start=\"1347\" data-end=\"1385\"\u003e2\" straight-through extension tube\u003c\/strong\u003e with T2 and 2\" interfaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1414\" data-end=\"1591\"\u003e\n\u003cp data-start=\"1416\" data-end=\"1453\"\u003e\u003cstrong data-start=\"1416\" data-end=\"1451\"\u003eFocal Length Guidance (Visual):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1456\" data-end=\"1591\"\u003e\n\u003cli data-start=\"1456\" data-end=\"1486\"\u003e\n\u003cp data-start=\"1458\" data-end=\"1486\"\u003e\u003cstrong data-start=\"1458\" data-end=\"1467\"\u003eB600:\u003c\/strong\u003e up to \u003cstrong data-start=\"1474\" data-end=\"1484\"\u003e600 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1489\" data-end=\"1521\"\u003e\n\u003cp data-start=\"1491\" data-end=\"1521\"\u003e\u003cstrong data-start=\"1491\" data-end=\"1501\"\u003eB1200:\u003c\/strong\u003e up to \u003cstrong data-start=\"1508\" data-end=\"1519\"\u003e1200 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1524\" data-end=\"1556\"\u003e\n\u003cp data-start=\"1526\" data-end=\"1556\"\u003e\u003cstrong data-start=\"1526\" data-end=\"1536\"\u003eB1800:\u003c\/strong\u003e up to \u003cstrong data-start=\"1543\" data-end=\"1554\"\u003e1800 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1559\" data-end=\"1591\"\u003e\n\u003cp data-start=\"1561\" data-end=\"1591\"\u003e\u003cstrong data-start=\"1561\" data-end=\"1571\"\u003eB3400:\u003c\/strong\u003e up to \u003cstrong data-start=\"1578\" data-end=\"1589\"\u003e3400 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1592\" data-end=\"1872\"\u003e\n\u003cp data-start=\"1594\" data-end=\"1735\"\u003e\u003cstrong data-start=\"1594\" data-end=\"1630\"\u003eFocal Length Guidance (Imaging):\u003c\/strong\u003e \u003cem data-start=\"1631\" data-end=\"1733\"\u003e(choose the next larger size vs. visual due to added back focus and moving the BF up the light cone)\u003c\/em\u003e\u003c\/p\u003e\n\u003cul data-start=\"1738\" data-end=\"1872\"\u003e\n\u003cli data-start=\"1738\" data-end=\"1768\"\u003e\n\u003cp data-start=\"1740\" data-end=\"1768\"\u003e\u003cstrong data-start=\"1740\" data-end=\"1749\"\u003eB600:\u003c\/strong\u003e up to \u003cstrong data-start=\"1756\" data-end=\"1766\"\u003e400 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1771\" data-end=\"1802\"\u003e\n\u003cp data-start=\"1773\" data-end=\"1802\"\u003e\u003cstrong data-start=\"1773\" data-end=\"1783\"\u003eB1200:\u003c\/strong\u003e up to \u003cstrong data-start=\"1790\" data-end=\"1800\"\u003e600 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1805\" data-end=\"1837\"\u003e\n\u003cp data-start=\"1807\" data-end=\"1837\"\u003e\u003cstrong data-start=\"1807\" data-end=\"1817\"\u003eB1800:\u003c\/strong\u003e up to \u003cstrong data-start=\"1824\" data-end=\"1835\"\u003e1200 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1840\" data-end=\"1872\"\u003e\n\u003cp data-start=\"1842\" data-end=\"1872\"\u003e\u003cstrong data-start=\"1842\" data-end=\"1852\"\u003eB3400:\u003c\/strong\u003e up to \u003cstrong data-start=\"1859\" data-end=\"1870\"\u003e1800 mm\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1873\" data-end=\"1935\"\u003e\n\u003cp data-start=\"1875\" data-end=\"1935\"\u003e\u003cstrong data-start=\"1875\" data-end=\"1888\"\u003eUse Case:\u003c\/strong\u003e Visual and imaging with Lunt H-alpha systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1936\" data-end=\"2058\"\u003e\n\u003cp data-start=\"1938\" data-end=\"2058\"\u003e\u003cstrong data-start=\"1938\" data-end=\"1958\"\u003eWarranty\/Safety:\u003c\/strong\u003e Lunt can only warrant \u003cstrong data-start=\"1981\" data-end=\"2007\"\u003esafety and performance\u003c\/strong\u003e when used with \u003cstrong data-start=\"2023\" data-end=\"2058\"\u003eLunt H-alpha filters\/telescopes\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1 data-start=\"2060\" data-end=\"2080\"\u003eWhat’s in the Box?\u003c\/h1\u003e\n\u003cul data-start=\"2081\" data-end=\"2275\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e\n\u003cli data-start=\"2081\" data-end=\"2170\"\u003e\n\u003cp data-start=\"2083\" data-end=\"2170\"\u003e\u003cstrong data-start=\"2083\" data-end=\"2107\"\u003eLunt Blocking Filter\u003c\/strong\u003e in your selected aperture (\u003cstrong data-start=\"2135\" data-end=\"2167\"\u003eB600 \/ B1200 \/ B1800 \/ B3400\u003c\/strong\u003e)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2171\" data-end=\"2275\" data-is-last-node=\"\"\u003e\n\u003cp data-start=\"2173\" data-end=\"2275\" data-is-last-node=\"\"\u003e\u003cstrong data-start=\"2173\" data-end=\"2191\"\u003eChosen housing\u003c\/strong\u003e: \u003cstrong data-start=\"2193\" data-end=\"2222\"\u003e1.25\" or 2\" diagonal (T2)\u003c\/strong\u003e, or \u003cstrong data-start=\"2227\" data-end=\"2275\" data-is-last-node=\"\"\u003e2\" straight-through extension tube (T2 + 2\")\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lunt Solar Systems","offers":[{"title":"4mm Filter in 1.25\" Diagonal","offer_id":50995046580544,"sku":"B1800d2","price":795.0,"currency_code":"USD","in_stock":true},{"title":"5mm Filter in 1.25″ Diagonal","offer_id":50995046613312,"sku":null,"price":379.0,"currency_code":"USD","in_stock":true},{"title":"6mm Filter in 1.25\" Diagonal","offer_id":50995046646080,"sku":"B600d1","price":395.0,"currency_code":"USD","in_stock":true},{"title":"6mm Filter in 2\" Diagonal","offer_id":50995046678848,"sku":"B600d2","price":395.0,"currency_code":"USD","in_stock":true},{"title":"6mm Filter in 2\" Straight-Through Tube","offer_id":50995046711616,"sku":"B600s","price":395.0,"currency_code":"USD","in_stock":true},{"title":"12mm Filter in 1.25\" Diagonal","offer_id":50995046744384,"sku":"B1200d1","price":495.0,"currency_code":"USD","in_stock":true},{"title":"12mm Filter in 2\" Diagonal","offer_id":50995046777152,"sku":"B1200d2","price":495.0,"currency_code":"USD","in_stock":true},{"title":"12mm Filter in 2\" Straight-Through Tube","offer_id":50995046809920,"sku":"B1200s","price":495.0,"currency_code":"USD","in_stock":true},{"title":"18mm Filter in 1.25\" Diagonal","offer_id":50995046842688,"sku":"B1800d1","price":795.0,"currency_code":"USD","in_stock":true},{"title":"18mm Filter in 2\" Diagonal","offer_id":50995046875456,"sku":"B1800d2","price":795.0,"currency_code":"USD","in_stock":true},{"title":"18mm Filter in 2\" Straight-Through Tube","offer_id":50995046908224,"sku":"B1800s","price":795.0,"currency_code":"USD","in_stock":true},{"title":"34mm Filter in 2\" Straight-Through Tube","offer_id":50995046940992,"sku":"B1800d13","price":1199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/B1800-Blocking-Filter-Profile.jpg?v=1756151414","url":"https:\/\/astroworldtelescopes.com\/products\/lunt-18mm-blocking-filter-2-in-star-diagonal-with-t2-connection","provider":"Astroworld Telescopes","version":"1.0","type":"link"}