{"id":10113,"date":"2025-08-27T18:00:46","date_gmt":"2025-08-27T16:00:46","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=10113"},"modified":"2026-10-31T01:08:03","modified_gmt":"2026-10-31T00:08:03","slug":"daystar-quark-gemini-deux-en-un-chromosphere-et-prominence-dans-le-meme-quark","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark-gemini-deux-en-un-chromosphere-et-prominence-dans-le-meme-quark\/","title":{"rendered":"DayStar Quark GEMINI \"Two in one\" - Chromosphere and Prominence in the same Quark"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><h2 style=\"text-align: center;\">DayStar QUARK Gemini - Hydrogen-Alpha Eyepiece filter<\/h2>\n<div class=\"container\">\n<header><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-10116 size-large\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-1024x1024.avif\" alt=\"\" width=\"800\" height=\"800\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-1024x1024.avif 1024w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-300x300.avif 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-150x150.avif 150w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-768x768.avif 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-12x12.avif 12w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-600x600.avif 600w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime-100x100.avif 100w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/daystar_quark_gemini_dsz4g_11-avec-arriere-plan-supprime.avif 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p class=\"lead\">Turn your refractor into a safe, portable solar telescope. <strong>The QUARK Gemini is a true \"two-in-one\".<\/strong> It simultaneously contains <strong>Prominence<\/strong> and <strong>Chromosphere<\/strong> with instant glide to switch from one to the other, without changing eyepieces or refocusing.<\/p>\n<\/header>\n<section>\n<h2>Why QUARK Gemini?<\/h2>\n<div class=\"hero-note\">\n<ul>\n<li>Two separate Fabry\u2013P\u00e9rot etalons integrated into the same eyepiece housing (Prominence with a wider band and Chromosphere with a narrower band).<\/li>\n<li>Slide-action: simply slide the side arm like an optometric test to switch from the bright view of the protuberances to the contrasting image of the surface.<\/li>\n<li>No need for additional adapters or refocusing - everything is integrated into a lightweight, compact device.<\/li>\n<li>Perfect for educational demonstrations or time-saving comparative imaging.<\/li>\n<\/ul>\n<\/div>\n<p class=\"callout\">Amateur astronomers and teachers can demonstrate the differences between the surface and prominences one after another, while astrophotographers can quickly capture comparative images.<\/p>\n<\/section>\n<section>\n<h2>Product summary<\/h2>\n<p>The QUARK Gemini is an all-in-one H-alpha eyepiece for refractors (F\/4 to F\/8 ideal), combining 4.2\u00d7 telecentric Barlow optimized for 656 nm and two switchable Fabry-P\u00e9rot standards for Prominence and Chromosphere. Includes 1.25\u2033 &amp; 2\u2033 sliders, USB power supply, tuning control and built-in protection.<\/p>\n<\/section>\n<section>\n<h2>Keep your sunglasses on and discover two sides of the Sun<\/h2>\n<p>An achromatic, ED, apochromatic, or Petzval-compatible eyepiece can serve as the foundation of your solar setup. The Gemini, with its built-in telecentric lens, is primarily designed for F\/4 to F\/8 refractors. Switching between its two filters allows you to compare details of the chromosphere and prominences using the same instrument.<\/p>\n<p>Mechanical compatibility alone is not enough: the diameter, focal ratio, and energy rejection must be verified with the <a href=\"https:\/\/www.daystarfilters.com\/quarkcompatibility\/\" target=\"_blank\" rel=\"noopener\">DayStar Official Compatibility Checker<\/a>. For an SCT or a Maksutov, see the entry for the <a href=\"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark-gemini-combo-deux-en-un-pour-sct-et-mak-chromosphere-et-prominence\/\">Gemini Combo<\/a> and its installation requirements. Each configuration must comply with the DayStar instructions.<\/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>Technical specifications<\/h2>\n<table class=\"specs\" aria-label=\"QUARK Gemini specifications\">\n<tbody>\n<tr>\n<th>Type<\/th>\n<td>Eyepiece H-alpha Gemini - switchable double standard<\/td>\n<\/tr>\n<tr>\n<th>Models<\/th>\n<td>Prominence &amp; Chromosphere integrated, slide-action<\/td>\n<\/tr>\n<tr>\n<th>Integrated Barlow<\/th>\n<td>4.2\u00d7 telecentric, optimized for 656 nm<\/td>\n<\/tr>\n<tr>\n<th>Clear aperture<\/th>\n<td>22 mm<\/td>\n<\/tr>\n<tr>\n<th>Blocking filter<\/th>\n<td>12 mm integrated<\/td>\n<\/tr>\n<tr>\n<th>Eyepiece outlet<\/th>\n<td>1.25\u2033 standard; 1.25\u2033 &amp; 2\u2033 snouts supplied<\/td>\n<\/tr>\n<tr>\n<th>Power supply<\/th>\n<td>USB 5 V 2 A. 90-240 VAC mains adapter included<\/td>\n<\/tr>\n<tr>\n<th>Control<\/th>\n<td>Two +\/-0.5 \u00c5 tuning wheels with detents every 0.1 \u00c5, status LED<\/td>\n<\/tr>\n<tr>\n<th>Warranty<\/th>\n<td>5 years<\/td>\n<\/tr>\n<tr>\n<th>Optimum use<\/th>\n<td>f\/4 - f\/8 refractors; full disc up to ~450 mm focal length<\/td>\n<\/tr>\n<tr>\n<th>Consumption<\/th>\n<td>Low - compatible with optional 8h battery pack<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section>\n<h2>Prominence \/ Chromosphere comparison (integrated into Gemini)<\/h2>\n<table aria-label=\"Prominence versus Chromosphere\">\n<thead>\n<tr>\n<th>Criteria<\/th>\n<th>Prominence<\/th>\n<th>Chromosphere<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Bandwidth FWHM<\/td>\n<td>Wider \u2192 brighter<\/td>\n<td>Narrower \u2192 better surface contrast<\/td>\n<\/tr>\n<tr>\n<td>Filaments (on disc)<\/td>\n<td>Difficult to see<\/td>\n<td>Visible and detailed<\/td>\n<\/tr>\n<tr>\n<td>Protuberances<\/td>\n<td>Very bright, with a limb<\/td>\n<td>Visible, but less brilliant<\/td>\n<\/tr>\n<tr>\n<td>Detail contrast<\/td>\n<td>Less contrast, brightness priority<\/td>\n<td>High - ideal for chromospheric detail<\/td>\n<\/tr>\n<tr>\n<td>Recommended use<\/td>\n<td>Rapid visual observation of protuberances<\/td>\n<td>Astrophotography and detailed surface observation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"callout\">With Gemini, you can instantly switch from one to the other according to your needs, without having to change equipment.<\/p>\n<\/section>\n<section>\n<h2>Box contents<\/h2>\n<ul>\n<li>QUARK Gemini (Prominence &amp; Chromosphere)<\/li>\n<li>Snouts 1.25\u2033 and 2.0\u2033 with coder<\/li>\n<li>Brass clamping ring<\/li>\n<li>Mains adapter 90-240 VAC<\/li>\n<li>Pelican-style case for transport and protection<\/li>\n<li>Documentation &amp; 5-year warranty<\/li>\n<li>Optional: 8h battery pack<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>Quick FAQs<\/h2>\n<h3>Can we show both Prominence and Chromosphere?<\/h3>\n<p>Yes - simply slide the side arm to switch from one to the other instantly.<\/p>\n<h3>Is it safe for direct observation of the Sun?<\/h3>\n<p>Yes, but only with a complete and validated solar power setup that includes the power output required for your instrument, and in accordance with the manufacturer's instructions.<\/p>\n<\/section>\n<footer>DayStar Instruments - Information sheet. Check compatibility with your instrument before purchase. Contact &amp; support: service@daystarfilters.com<\/footer>\n<\/div>\n<p>&nbsp;<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Observe two different views of the Sun with your compatible telescope: the Quark Gemini switches between the chromosphere and the prominences without changing filters. Built-in 4.2\u00d7 telecentric eyepiece; F\/4 to F\/8 refractors are recommended; protective filters must be adapted to the instrument.<\/p>","protected":false},"featured_media":10116,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[834],"product_cat":[645,642,70],"product_tag":[],"class_list":["post-10113","product","type-product","status-publish","has-post-thumbnail","product_brand-daystar","product_cat-filtres-solaires","product_cat-materiel-pour-lobservation-solaire","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\/10113","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=10113"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/10116"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=10113"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=10113"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=10113"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=10113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}