{"product_id":"lunt-ls40fha-front-mount-40mm-double-stack-solar-filter","title":"Lunt Solar Systems LS40FHa Front Mount 40mm Double Stack Solar Filter","description":"\u003cp\u003e\u003cstrong\u003eNow equipped with Lunt’s newer, higher-performing etalons, these telescopes deliver a tighter ≤0.35Å FWHM per etalon, improved from the previous ~0.55Å design. In double-stack configuration, system bandwidth drops to approximately 0.22Å for even greater contrast and finer solar surface detail.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eLS40FHa Double Stack Solar Filter\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\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\/strong\u003e\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\u003ch5\u003eLS40FHa Specifications: (single filter)\u003c\/h5\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: Fits in optional aluminum finished hard case with fitted foam for LS40mm\u003c\/li\u003e\n\u003cli\u003eFilter Weight: ~1 lb (~.4kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"has-text-align-left\"\u003eSee the latest Solar news from \u003ca href=\"https:\/\/www.nasa.gov\/sun\"\u003eNASA\u003c\/a\u003e.\u003c\/p\u003e","brand":"Lunt Solar Systems","offers":[{"title":"Default Title","offer_id":48956581511420,"sku":"LS40FHaP","price":694.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0610\/7702\/9116\/files\/40ds-tres_f63ad6a2-cfba-4a6e-818e-aeca7243acda.png?v=1775935029","url":"https:\/\/usa.all-startelescope.com\/products\/lunt-ls40fha-front-mount-40mm-double-stack-solar-filter","provider":"All-Star Telescope Canada","version":"1.0","type":"link"}