{"product_id":"lunt-ls40fha-double-stack-filter","title":"Lunt LS40FHa Solar Filter (LS40FHa) – Previous Generation Sale","description":"\u003ch1\u003eLunt 40mm Front Mounted Double Stack Filter - Previous Generation Sale\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli\u003eIt’s finally available! The Lunt Solar 40mm Double Stack Hydrogen-alpha Filter.\u003c\/li\u003e\n\u003cli\u003eLS40FHa solar filter front-mounted non-obstructed hydrogen-alpha filter for use with the Lunt Solar Systems 40mm Dedicated Hydrogen Alpha Telescope\u003c\/li\u003e\n\u003cli\u003eAttaches Directly to the Objective of the Lunt 40mm Dedicated Ha Telescope\u003c\/li\u003e\n\u003cli\u003eLowers the Bandpass of your existing LS40mm telescope to ~\u0026lt;0.5A !\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDSII Requirements: Adapter is included with Double Stack Unit\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr\u003e\u003cstrong\u003eLS40FHa Double Stack Solar Filter\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe Lunt LS40FHa Solar Filter is a 40 mm aperture (no central obstruction) integrally tuned etalon for use on Lunt Dedicated 40 mm Telescopes\u003c\/p\u003e\n\u003cp\u003eThe Lunt LS40FHa Double Stack Unit is intended for use with the Lunt 40mm Dedicated Hydrogen Alpha System and requires a Lunt Solar Systems Blocking Filter  (this is a safety requirement). \u003c\/p\u003e\n\u003cp\u003eBecause the LS40FHa Solar Filter has an estimated bandpass of \u0026lt;0.70 Angstrom it is capable of providing high contrast views of both surface and edge detail. Significantly, adding an additional etalon system (double-stacking) will reduce the bandpass to ~\u0026lt;0.50. Allowing for higher resolution viewing and\/or imaging. \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Aperture: 40 mm\u003c\/li\u003e\n\u003cli\u003eEtalon:  \u0026lt;0.50 Angstrom as Double-Stack\u003c\/li\u003e\n\u003cli\u003eTuning: Tilt\u003c\/li\u003e\n\u003cli\u003eFocal Length: 400mm (Unchanged)\u003c\/li\u003e\n\u003cli\u003eFilter Storage: Aluminum finished hard case with fitted foam\u003c\/li\u003e\n\u003cli\u003eFilter Weight: ~1 lb (~.4kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eDouble Stack Filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003eLunt 5-Year Warranty\u003c\/p\u003e","brand":"Lunt","offers":[{"title":"Default Title","offer_id":48778779328741,"sku":"LS-LS40FHa","price":850.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/lunt-ls40fha-front-mounted-40mm-double-stack-filter-ls40fha-astronomy-plus-1.webp?v=1690488969","url":"https:\/\/astronomyplus.com\/products\/lunt-ls40fha-double-stack-filter","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}