{"id":10123,"date":"2025-08-27T18:55:52","date_gmt":"2025-08-27T16:55:52","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=10123"},"modified":"2026-10-31T01:08:15","modified_gmt":"2026-10-31T00:08:15","slug":"daystar-quark-gemini-combo-deux-en-un-pour-sct-et-mak-chromosphere-et-prominence","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark-gemini-combo-deux-en-un-pour-sct-et-mak-chromosphere-et-prominence\/","title":{"rendered":"DayStar Quark GEMINI two-in-one combo for SCT and Mak - Chromosphere and Prominence"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><p>&nbsp;<\/p>\n<div class=\"container\">\n<header>\n<h1 style=\"text-align: center;\">DayStar Combo Gemini H-Alpha - For SCT, Mak and F\/15-F\/30 refractors<\/h1>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-10124 size-full\" src=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo.avif\" alt=\"\" width=\"1000\" height=\"750\" srcset=\"https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo.avif 1000w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo-300x225.avif 300w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo-768x576.avif 768w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo-16x12.avif 16w, https:\/\/deep-space-astronomy.ch\/wp-content\/uploads\/2025\/08\/GeminiCombo-600x450.avif 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p class=\"lead\">The Gemini Combo combines H-alpha filters <strong>Prominence<\/strong> and <strong>Chromosphere<\/strong> for instant switching via a side-mounted slider. Enjoy the best of both bandwidth options in a single tool, without hardware swapping or refocusing.<\/p>\n<\/header>\n<section>\n<h2>Presentation<\/h2>\n<p>The Gemini Combo allows :<\/p>\n<ul>\n<li>Easily switch between Prominence (wide bandwidth) and Chromosphere (high contrast narrow bandwidth) like an optometric test.<\/li>\n<li>Instant observation without filter exchange or refocusing.<\/li>\n<li>Compatible with SCT, Maksutov and refractors via optional telecentric barlows (2.8x or 4.3x).<\/li>\n<li>Lightweight, compact all-in-one device, eliminating the need for additional adapters.<\/li>\n<li>Internal baffles for enhanced contrast and optimized 656 nm AR coatings.<\/li>\n<\/ul>\n<p class=\"callout\">Important: for SCT and Maksutov, a front-mount energy rejection filter (ERF) is mandatory to protect the optical tube and obtain optimum performance.<\/p>\n<\/section>\n<section>\n<h2>Upgrade Your Telescope for Solar Observation<\/h2>\n<p>The Gemini Combo allows you to use a compatible SCT, Maksutov, or refractor to view the Sun in two different H-alpha images. Its two switchable filters are particularly useful for quickly comparing prominences and chromospheric details during an animation or photo session.<\/p>\n<p>This Combo version does not include a built-in Barlow lens: the working focal ratio, any telecentric option, and the energy-rejection filter must be selected together. Check the <a href=\"https:\/\/www.daystarfilters.com\/quarkcompatibility\/\" target=\"_blank\" rel=\"noopener\">DayStar Official Compatibility Checker<\/a> and <a href=\"https:\/\/www.daystarfilters.com\/combo-gemini\/\" target=\"_blank\" rel=\"noopener\">Gemini Combo Instructions<\/a>. For a fast refractor, also compare the <a href=\"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-quark-gemini-deux-en-un-chromosphere-et-prominence-dans-le-meme-quark\/\">Gemini with built-in telecentric lens<\/a>.<\/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>\n<tbody>\n<tr>\n<th>Type<\/th>\n<td>Gemini H-alpha Combo filter (Prominence + Chromosphere)<\/td>\n<\/tr>\n<tr>\n<th>Compatibility<\/th>\n<td>SCT, Maksutov, F\/15-F\/30 refractors<\/td>\n<\/tr>\n<tr>\n<th>Eyepiece outlet<\/th>\n<td>1.25\u2033 standard, 1.25\u2033 snout included + 2\u00b0 off-axis adapter for ERF<\/td>\n<\/tr>\n<tr>\n<th>Barlow \/ Optics<\/th>\n<td>No integrated Barlow - 0 power, filter only. Optional telecentric barrows available.<\/td>\n<\/tr>\n<tr>\n<th>Blocking filter<\/th>\n<td>Integrated, 25 mm<\/td>\n<\/tr>\n<tr>\n<th>Clear aperture<\/th>\n<td>21 mm<\/td>\n<\/tr>\n<tr>\n<th>Power supply<\/th>\n<td>USB 5 V 1.5 A, incl. 90-240 V mains adapter<\/td>\n<\/tr>\n<tr>\n<th>Tuning<\/th>\n<td>Wheels for wing shift \u00b10.5 \u00c5 with notches every 0.1 \u00c5; LED status: power, warming, ready, fault<\/td>\n<\/tr>\n<tr>\n<th>Warranty<\/th>\n<td>5 years<\/td>\n<\/tr>\n<tr>\n<th>Supplied box<\/th>\n<td>Hard case for protection and transport<\/td>\n<\/tr>\n<tr>\n<th>Observation<\/th>\n<td>Full disk up to ~1800 mm focal length; no aperture limitation, use with SCT and Maks off-axis ERF<\/td>\n<\/tr>\n<tr>\n<th>Optional accessories<\/th>\n<td>8h battery pack<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section>\n<h2>Prominence versus Chromosphere<\/h2>\n<table>\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 \u2014 brighter<\/td>\n<td>Narrower \u2014 better surface contrast<\/td>\n<\/tr>\n<tr>\n<td>Filaments<\/td>\n<td>Difficult to observe<\/td>\n<td>Visible and detailed<\/td>\n<\/tr>\n<tr>\n<td>Protuberances<\/td>\n<td>Very shiny blade<\/td>\n<td>Visible but less brilliant<\/td>\n<\/tr>\n<tr>\n<td>Contrast<\/td>\n<td>Less contrast, brightness priority<\/td>\n<td>High contrast, ideal for chromospheric detail<\/td>\n<\/tr>\n<tr>\n<td>Recommended use<\/td>\n<td>Quick visual observation<\/td>\n<td>Detailed observation and astrophotography<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n<section>\n<h2>Important instructions for SCT \/ Maksutov<\/h2>\n<ul>\n<li>SCT: use an off-axis front-mount ERF with aperture reduction to protect the secondary mirror.<\/li>\n<li>Maksutov: ERF front-mount mandatory to avoid overheating the optical tube.<\/li>\n<li>Refractors: Check the working focal ratio and energy rejection before mounting the filter in the diagonal mirror.<\/li>\n<\/ul>\n<\/section>\n<footer>\u00a9 DayStar Instruments - Check compatibility before purchase. Support : service@daystarfilters.com | Tel : 866-680-6563<\/p>\n<\/footer>\n<\/div>\n<p>&nbsp;<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Discover the prominences and details of the chromosphere with two switchable H-alpha filters in the same Gemini Combo. For compatible SCTs, Maksutovs, and refractors: no built-in Barlow lens; working focal ratio and ERF must be verified for your mount.<\/p>","protected":false},"featured_media":10125,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[834],"product_cat":[645,642,70],"product_tag":[],"class_list":["post-10123","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\/10123","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=10123"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/10125"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=10123"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=10123"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=10123"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=10123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}