{"id":10133,"date":"2025-08-27T19:36:42","date_gmt":"2025-08-27T17:36:42","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=10133"},"modified":"2026-09-24T11:05:56","modified_gmt":"2026-09-24T09:05:56","slug":"daystar-quark-calcium-h-line","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark-calcium-h-line\/","title":{"rendered":"DayStar Quark - Calcium H-line"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><p>&nbsp;<\/p>\n<h1 style=\"text-align: center;\">Daystar Quark Calcium H-line<\/h1>\n<p class=\"price\"><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.daystarfilters.com\/df\/wp-content\/uploads\/2025\/03\/CalQuark2015-12-15-_Web.jpg\" \/><\/p>\n<h2>Description<\/h2>\n<p>The <strong>Quark Calcium H-line<\/strong> takes the practical, all-in-one concept of the original Quark, but optimized for the stingray <strong>Calcium H (397 nm)<\/strong>.<\/p>\n<p>Designed for <strong>F\/7 or more<\/strong>It allows both amateur and advanced astronomers to easily explore solar activity in Calcium.<\/p>\n<h2>Why choose Calcium H?<\/h2>\n<p>Stingrays <strong>Calcium H<\/strong> and <strong>Calcium K<\/strong> offer almost identical views of the solar surface.<br \/>\nHowever, many older astronomers do not perceive the K spectrum (393 nm) well. This is why the H-line (397 nm) is recommended for visual observation:<br \/>\nthe longer wavelength makes it accessible to a larger number of observers.<\/p>\n<p>With this filter, you can see :<\/p>\n<ul>\n<li>active regions and shiny beaches,<\/li>\n<li>faculae and structures close to sunspots,<\/li>\n<li>the chromospheric network in contrast.<\/li>\n<\/ul>\n<h2>Another way to view the Sun with your telescope<\/h2>\n<p>Calcium H complements the observation by <a href=\"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark\/\">H-alpha<\/a> with a focus on active regions and the chromospheric network. It allows you to expand the capabilities of your solar equipment without having to purchase a second dedicated telescope, once the configuration has been validated. Perception of the color violet varies from person to person: imaging is a useful option for comparing and sharing observations.<\/p>\n<p><strong>Calcium-Specific Compatibility:<\/strong> Refractors with an F\/7 or higher focal ratio, without a built-in Barlow lens. The filter must be suitable for this spectral line: red or yellow ERF filters are not suitable. See the <a href=\"https:\/\/www.daystarfilters.com\/calcium-quark\/\" target=\"_blank\" rel=\"noopener\">Official Recommendations from Calcium Quark<\/a> and have your edit approved.<\/p>\n<h3>Moving from visuals to imagery<\/h3>\n<p>Visit <a href=\"https:\/\/www.daystarfilters.com\/solar-accessories\/\" target=\"_blank\" rel=\"noopener\">DayStar Solar Accessories<\/a> allow you to adapt the connection to the eyepiece or camera: 1.25-inch or 2-inch connectors, T- or C-mounts, and adapters, depending on the model. Thread compatibility, focus extension, and focus must be checked for each combination. Accessories are sold separately.<\/p>\n<p>In astrophotography, a DayStar tilt adapter can help reduce Newton's rings. The results depend on the camera and the settings; see the <a href=\"https:\/\/www.daystarfilters.com\/interference-eliminator\/\" target=\"_blank\" rel=\"noopener\">Manufacturer's installation instructions<\/a> to choose the right adapter.<\/p>\n<h3>Do you have a project for your club or school?<\/h3>\n<p>DayStar has been developing solar equipment for over 50 years. Whether for an introductory course, an educational activity, or an imaging program, <a href=\"https:\/\/deep-space-astronomy.ch\/en\/contact\/\">Contact Deep Space Astronomy<\/a> Please provide the model of your instrument, your camera (if applicable), and your lenses: we'll help you choose a suitable setup and provide a quote.<\/p>\n<h2>Key features<\/h2>\n<table>\n<tbody>\n<tr>\n<th>Features<\/th>\n<th>Detail<\/th>\n<\/tr>\n<tr>\n<td>Wavelength<\/td>\n<td>Calcium H - 397 nm<\/td>\n<\/tr>\n<tr>\n<td>Bandwidth (FWHM)<\/td>\n<td>\u2248 5 \u00c5 (variable according to instrument)<\/td>\n<\/tr>\n<tr>\n<td>Compatible refractors<\/td>\n<td>F\/7 or higher (shorter possible with Powermate 2x-2.5x)<\/td>\n<\/tr>\n<tr>\n<td>Design<\/td>\n<td>All-in-one, lightweight eyepiece format<\/td>\n<\/tr>\n<tr>\n<td>Power supply<\/td>\n<td>USB, 5V 1.5A, low power consumption (optional portable battery)<\/td>\n<\/tr>\n<tr>\n<td>Compatible ERF filters<\/td>\n<td>No red or yellow glass. Recommended: UV\/IR cut filter<\/td>\n<\/tr>\n<tr>\n<td>Optical treatment<\/td>\n<td>AR coatings optimized for 397 nm, internal baffling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Safety and recommendations<\/h2>\n<ul>\n<li>A <strong>energy rejection filter (ERF)<\/strong> adapted to the telescope is required for safe use.<\/li>\n<li>The Calcium Quark <strong>cannot be used with a front-mounted ERF<\/strong> of the instrument.<\/li>\n<li>The use of a UV\/IR cut filter is strongly recommended to protect the optics and the observer.<\/li>\n<\/ul>\n<h2>Summary<\/h2>\n<p>The <strong>Daystar Quark Calcium H-line<\/strong> makes solar observation in Calcium accessible, simple and affordable,<br \/>\nwith a mount designed for the refracting telescopes specified by the manufacturer. Visual perception at this wavelength varies depending on the observer.<br \/>\nIt's an ideal educational and scientific tool for exploring chromospheric phenomena.<\/p>\n<p class=\"note\">* The Quark is a product of DayStar Instruments, using Fabry-P\u00e9rot etalon technology.<\/p>\n<p>&nbsp;<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Explore the Sun\u2019s active regions in the calcium H line at 397 nm using your F\/7 or higher refractor. This approach complements H-alpha for visual observation and imaging, with protection suitable for calcium; visibility through the eyepiece varies depending on the observer.<\/p>","protected":false},"featured_media":10134,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[834],"product_cat":[642,645,70],"product_tag":[],"class_list":["post-10133","product","type-product","status-publish","has-post-thumbnail","product_brand-daystar","product_cat-materiel-pour-lobservation-solaire","product_cat-filtres-solaires","product_cat-reducteurs-et-extendeurs-de-focale","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/10133","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=10133"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/10134"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=10133"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=10133"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=10133"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=10133"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}