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More products from the brand :DayStar

DayStar Quark GEMINI two-in-one combo for SCT and Mak - Chromosphere and Prominence

CHF 2'380

Disponible en stock chez le fournisseur

Free delivery
Easy, free returns

 

DayStar Combo Gemini H-Alpha - For SCT, Mak and F/15-F/30 refractors

The Gemini Combo combines H-alpha filters Prominence and Chromosphere for instant switching via a side-mounted slider. Enjoy the best of both bandwidth options in a single tool, without hardware swapping or refocusing.

Presentation

The Gemini Combo allows :

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

Important: for SCT and Maksutov, a front-mount energy rejection filter (ERF) is mandatory to protect the optical tube and obtain optimum performance.

Technical specifications

Type Gemini H-alpha Combo filter (Prominence + Chromosphere)
Compatibility SCT, Maksutov, F/15-F/30 refractors
Eyepiece outlet 1.25″ standard, 1.25″ snout included + 2° off-axis adapter for ERF
Barlow / Optics No integrated Barlow - 0 power, filter only. Optional telecentric barrows available.
Blocking filter Integrated, 25 mm
Clear aperture 21 mm
Power supply USB 5 V 1.5 A, incl. 90-240 V mains adapter
Tuning Wheels for wing shift ±0.5 Å with notches every 0.1 Å; LED status: power, warming, ready, fault
Warranty 5 years
Supplied box Hard case for protection and transport
Observation Full disk up to ~1800 mm focal length; no aperture limitation, use with SCT and Maks off-axis ERF
Optional accessories 8h battery pack

Prominence versus Chromosphere

Criteria Prominence Chromosphere
Bandwidth FWHM Wider (>0.6 Å) - brighter Narrower (<0.5 Å) - better surface contrast
Filaments Difficult to observe Visible and detailed
Protuberances Very shiny blade Visible but less brilliant
Contrast Less contrast, brightness priority High contrast, ideal for chromospheric detail
Recommended use Quick visual observation Detailed observation and astrophotography

Important instructions for SCT / Maksutov

  • SCT: use an off-axis front-mount ERF with aperture reduction to protect the secondary mirror.
  • Maksutov: ERF front-mount mandatory to avoid overheating the optical tube.
  • Refractors F/15-F/30: insert the Combo Gemini directly into the bend, no additional adjustment required.
© DayStar Instruments - Check compatibility before purchase. Support : service@daystarfilters.com | Tel : 866-680-6563

 

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