{"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&p=10113"},"modified":"2025-08-27T18:26:10","modified_gmt":"2025-08-27T16:26:10","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":"

DayStar QUARK Gemini - Hydrogen-Alpha Eyepiece filter<\/h2>\n
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Turn your refractor into a safe, portable solar telescope. The QUARK Gemini is a true \"two-in-one\".<\/strong> It simultaneously contains Prominence<\/strong> and Chromosphere<\/strong> with instant glide to switch from one to the other, without changing eyepieces or refocusing.<\/p>\n<\/header>\n

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Why QUARK Gemini?<\/h2>\n
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  • Two separate Fabry-P\u00e9rot standards integrated in the same ocular housing (Prominence wide >0.6\u00c5 and Chromosphere narrow <0.5\u00c5).<\/li>\n
  • 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
  • No need for additional adapters or refocusing - everything is integrated into a lightweight, compact device.<\/li>\n
  • Perfect for educational demonstrations or time-saving comparative imaging.<\/li>\n<\/ul>\n<\/div>\n

    Amateur astronomers and teachers can simultaneously show the differences between surface and protuberances, while astrophotographers can quickly capture comparative images.<\/p>\n<\/section>\n

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    Product summary<\/h2>\n

    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 & 2\u2033 sliders, USB power supply, tuning control and built-in protection.<\/p>\n<\/section>\n

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    Technical specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Type<\/th>\nEyepiece H-alpha Gemini - switchable double standard<\/td>\n<\/tr>\n
    Models<\/th>\nProminence & Chromosphere integrated, slide-action<\/td>\n<\/tr>\n
    Integrated Barlow<\/th>\n4.2\u00d7 telecentric, optimized for 656 nm<\/td>\n<\/tr>\n
    Clear aperture<\/th>\n22 mm<\/td>\n<\/tr>\n
    Blocking filter<\/th>\n12 mm integrated<\/td>\n<\/tr>\n
    Eyepiece outlet<\/th>\n1.25\u2033 standard; 1.25\u2033 & 2\u2033 snouts supplied<\/td>\n<\/tr>\n
    Power supply<\/th>\nUSB 5 V 2 A. 90-240 VAC mains adapter included<\/td>\n<\/tr>\n
    Control<\/th>\nTwo +\/-0.5 \u00c5 tuning wheels with detents every 0.1 \u00c5, status LED<\/td>\n<\/tr>\n
    Warranty<\/th>\n5 years<\/td>\n<\/tr>\n
    Optimum use<\/th>\nf\/4 - f\/8 refractors; full disc up to ~450 mm focal length<\/td>\n<\/tr>\n
    Consumption<\/th>\nLow - compatible with optional 8h battery pack<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n
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    Prominence \/ Chromosphere comparison (integrated into Gemini)<\/h2>\n\n\n\n\n\n\n\n\n\n
    Criteria<\/th>\nProminence<\/th>\nChromosphere<\/th>\n<\/tr>\n<\/thead>\n
    Bandwidth FWHM<\/td>\nWider (>0.6\u00c5) \u2192 brighter<\/td>\nNarrower (<0.5\u00c5) \u2192 better surface contrast<\/td>\n<\/tr>\n
    Filaments (on disc)<\/td>\nDifficult to see<\/td>\nVisible and detailed<\/td>\n<\/tr>\n
    Protuberances<\/td>\nVery bright, with a limb<\/td>\nVisible, but less brilliant<\/td>\n<\/tr>\n
    Detail contrast<\/td>\nLess contrast, brightness priority<\/td>\nHigh - ideal for chromospheric detail<\/td>\n<\/tr>\n
    Recommended use<\/td>\nRapid visual observation of protuberances<\/td>\nAstrophotography and detailed surface observation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    With Gemini, you can instantly switch from one to the other according to your needs, without having to change equipment.<\/p>\n<\/section>\n

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    Box contents<\/h2>\n
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    • QUARK Gemini (Prominence & Chromosphere)<\/li>\n
    • Snouts 1.25\u2033 and 2.0\u2033 with coder<\/li>\n
    • Brass clamping ring<\/li>\n
    • Mains adapter 90-240 VAC<\/li>\n
    • Pelican-style case for transport and protection<\/li>\n
    • Documentation & 5-year warranty<\/li>\n
    • Optional: 8h battery pack<\/li>\n<\/ul>\n<\/section>\n
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      Quick FAQs<\/h2>\n

      Can we show both Prominence and Chromosphere?<\/h3>\n

      Yes - simply slide the side arm to switch from one to the other instantly.<\/p>\n

      Is it safe for direct observation of the Sun?<\/h3>\n

      Yes, when used according to the manufacturer's instructions and with a stable mount.<\/p>\n<\/section>\n