{"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&p=10123"},"modified":"2025-08-27T18:59:24","modified_gmt":"2025-08-27T16:59:24","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":"

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DayStar Combo Gemini H-Alpha - For SCT, Mak and F\/15-F\/30 refractors<\/h1>\n

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The Gemini Combo combines H-alpha filters Prominence<\/strong> and 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

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Presentation<\/h2>\n

The Gemini Combo allows :<\/p>\n

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  • Easily switch between Prominence (wide bandwidth) and Chromosphere (high contrast narrow bandwidth) like an optometric test.<\/li>\n
  • Instant observation without filter exchange or refocusing.<\/li>\n
  • Compatible with SCT, Maksutov and refractors via optional telecentric barlows (2.8x or 4.3x).<\/li>\n
  • Lightweight, compact all-in-one device, eliminating the need for additional adapters.<\/li>\n
  • Internal baffles for enhanced contrast and optimized 656 nm AR coatings.<\/li>\n<\/ul>\n

    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

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    Technical specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Type<\/th>\nGemini H-alpha Combo filter (Prominence + Chromosphere)<\/td>\n<\/tr>\n
    Compatibility<\/th>\nSCT, Maksutov, F\/15-F\/30 refractors<\/td>\n<\/tr>\n
    Eyepiece outlet<\/th>\n1.25\u2033 standard, 1.25\u2033 snout included + 2\u00b0 off-axis adapter for ERF<\/td>\n<\/tr>\n
    Barlow \/ Optics<\/th>\nNo integrated Barlow - 0 power, filter only. Optional telecentric barrows available.<\/td>\n<\/tr>\n
    Blocking filter<\/th>\nIntegrated, 25 mm<\/td>\n<\/tr>\n
    Clear aperture<\/th>\n21 mm<\/td>\n<\/tr>\n
    Power supply<\/th>\nUSB 5 V 1.5 A, incl. 90-240 V mains adapter<\/td>\n<\/tr>\n
    Tuning<\/th>\nWheels for wing shift \u00b10.5 \u00c5 with notches every 0.1 \u00c5; LED status: power, warming, ready, fault<\/td>\n<\/tr>\n
    Warranty<\/th>\n5 years<\/td>\n<\/tr>\n
    Supplied box<\/th>\nHard case for protection and transport<\/td>\n<\/tr>\n
    Observation<\/th>\nFull disk up to ~1800 mm focal length; no aperture limitation, use with SCT and Maks off-axis ERF<\/td>\n<\/tr>\n
    Optional accessories<\/th>\n8h battery pack<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n
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    Prominence versus Chromosphere<\/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) - brighter<\/td>\nNarrower (<0.5 \u00c5) - better surface contrast<\/td>\n<\/tr>\n
    Filaments<\/td>\nDifficult to observe<\/td>\nVisible and detailed<\/td>\n<\/tr>\n
    Protuberances<\/td>\nVery shiny blade<\/td>\nVisible but less brilliant<\/td>\n<\/tr>\n
    Contrast<\/td>\nLess contrast, brightness priority<\/td>\nHigh contrast, ideal for chromospheric detail<\/td>\n<\/tr>\n
    Recommended use<\/td>\nQuick visual observation<\/td>\nDetailed observation and astrophotography<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/section>\n
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    Important instructions for SCT \/ Maksutov<\/h2>\n
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    • SCT: use an off-axis front-mount ERF with aperture reduction to protect the secondary mirror.<\/li>\n
    • Maksutov: ERF front-mount mandatory to avoid overheating the optical tube.<\/li>\n
    • Refractors F\/15-F\/30: insert the Combo Gemini directly into the bend, no additional adjustment required.<\/li>\n<\/ul>\n<\/section>\n