{"id":7284,"date":"2025-04-26T17:30:45","date_gmt":"2025-04-26T15:30:45","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=7284"},"modified":"2025-11-18T18:01:29","modified_gmt":"2025-11-18T17:01:29","slug":"filtre-antlia-solar-discover-dualband-erf-rejection-denergie","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/filtre-antlia-solar-discover-dualband-erf-rejection-denergie\/","title":{"rendered":"Antlia Solar Discover Dualband ERF filter (energy rejection)"},"content":{"rendered":"<h3 style=\"text-align: center;\">Antlia Solar Discover Dualband Energy Rejection Filter (ERF)<\/h3>\n<p>The Antlia Solar Discover Dualband ERF filter is designed to protect solar imaging equipment by massively rejecting heat before it enters the telescope. It enables targeted transmission of H-alpha (656.3nm), Calcium K-Line (393.3nm) and Calcium H-Line (396.8nm) wavelengths, while effectively blocking ultraviolet (UV) and infrared (IR).<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone  wp-image-7291\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample.jpg\" alt=\"\" width=\"567\" height=\"567\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample.jpg 1000w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-300x300.jpg 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-150x150.jpg 150w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-768x768.jpg 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-12x12.jpg 12w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-600x600.jpg 600w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-photo-sample-100x100.jpg 100w\" sizes=\"(max-width: 567px) 100vw, 567px\" \/><img decoding=\"async\" class=\"alignnone  wp-image-7292\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample.jpg\" alt=\"\" width=\"569\" height=\"569\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample.jpg 1000w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-300x300.jpg 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-150x150.jpg 150w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-768x768.jpg 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-12x12.jpg 12w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-600x600.jpg 600w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/04\/ERF-and-3nm-CaK-130-photo-sample-100x100.jpg 100w\" sizes=\"(max-width: 569px) 100vw, 569px\" \/><\/p>\n<h3>Key features<\/h3>\n<ul>\n<li>Wide bandwidth of 25nm for H-alpha and CaK\/CaH<\/li>\n<li>High transmission: over 90%<\/li>\n<li>Advanced multilayer coatings applied to a polished, heat-resistant double-sided substrate<\/li>\n<li>Coating range extended from 200nm to 1700nm<\/li>\n<li>Optical quality: Transmitted wavefront \u03bb\/4 or better<\/li>\n<li>Available in several sizes to suit different opening diameters<\/li>\n<\/ul>\n<h3>Applications and Performance<\/h3>\n<ul>\n<li>Thermal protection for solar imaging with Antlia Solar Discover 3nm CaK, 5\u00c5 CaK, and Dualband Ha, CaK, CaH Assembly filters.<\/li>\n<li>Improves equipment safety and reduces heat-induced band offset<\/li>\n<li>Compatible with \u2264110mm refractors for the 2\u2033 mounted version.<\/li>\n<\/ul>\n<h3>Technical Specifications<\/h3>\n<ul>\n<li>FWHM: 25nm (H-alpha and CaK\/CaH)<\/li>\n<li>CWL (Center wavelength) :\n<ul>\n<li>H-alpha: 656.3nm<\/li>\n<li>CaK: 393.3nm (covering CaK 393.3nm and CaH 396.8nm)<\/li>\n<\/ul>\n<\/li>\n<li>Maximum transmission: &gt;90%<\/li>\n<li>Thickness :\n<ul>\n<li>10mm \u00b1 0.05mm for 130mm, 150mm, 200mm mounted<\/li>\n<li>3mm \u00b1 0.05mm for 2\u2033 mounted<\/li>\n<\/ul>\n<\/li>\n<li>Coating Range: 200-1700nm<\/li>\n<\/ul>\n<h3>Available sizes<\/h3>\n<ul>\n<li>2\u2033 mounted<\/li>\n<li>ERF 130mm with cell<\/li>\n<li>ERF 150mm with cell<\/li>\n<li>ERF 200mm with cell<\/li>\n<\/ul>\n<h3>Important notes<\/h3>\n<ul>\n<li>The Dualband ERF filter cannot be used on its own.<\/li>\n<li>It must be combined with professional solar equipment that has its own built-in blocking filter.<\/li>\n<li>Do not use for direct visual observation without a complete sun safety system.<\/li>\n<li>The 2\u2033 version should be used exclusively on refractors with 110mm aperture or less.<\/li>\n<\/ul>\n<h3>Warranty<\/h3>\n<ul>\n<li>Warranty period: 3 years<\/li>\n<\/ul>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Antlia Solar Discover Dualband Energy Rejection Filter (ERF) Le filtre Antlia Solar Discover Dualband ERF est con\u00e7u pour prot\u00e9ger les \u00e9quipements d&rsquo;imagerie solaire en rejetant massivement la chaleur avant son entr\u00e9e dans le t\u00e9lescope. Il permet la transmission cibl\u00e9e des longueurs d&rsquo;onde H-alpha (656.3nm), Calcium K-Line (393.3nm) et Calcium H-Line (396.8nm), tout en bloquant efficacement [&hellip;]<\/p>\n","protected":false},"featured_media":7289,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[791],"product_cat":[642,645],"product_tag":[],"class_list":{"0":"post-7284","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_brand-antlia","7":"product_cat-materiel-pour-lobservation-solaire","8":"product_cat-filtres-solaires","10":"first","11":"outofstock","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-variable"},"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/7284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/comments?post=7284"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/7289"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=7284"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=7284"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=7284"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=7284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}