DayStar Quark Gemini Switchable Dual Bandpass Prominence and Chromosphere Filter

The DayStar Quark Gemini is a versatile, dual-bandpass Hydrogen Alpha filtering system that allows observers and imagers to switch instantly between Prominence and Chromosphere views at the push of a button. Combining two precision-tuned H-alpha etalons in a single compact housing, the Gemini offers unmatched flexibility for solar enthusiasts who want to capture both bright limb activity and detailed surface structure without swapping equipment.

Designed to operate like a standard eyepiece, the Quark Gemini integrates all required components—including etalons, blocking filters, and telecentric optics—into one self-contained unit. Powered through a simple USB connection, its electronic tuning and thermal regulation maintain precise bandpass stability in both modes. The result is a reliable, high-contrast solar filter suitable for a wide range of refractor telescopes.

Prominence mode emphasizes bright off-limb features such as loops, spicules, and eruptive events, while Chromosphere mode brings out filaments, plage, sunspots, and fine surface texture. This combination makes the Gemini ideal for observers, imagers, educators, and outreach setups needing an adaptable and engaging solar viewing experience.

Key Features
• Switchable dual-mode Hydrogen Alpha filter: Prominence and Chromosphere
• Integrated etalons, blocking filters, and telecentric optics in one compact unit
• Push-button mode selection for fast Prominence/Chromosphere switching
• Designed for refractors from f/4 to f/8 (internally optimized to ~f/30)
• 1.25-inch eyepiece holder with 2-inch nosepiece for broad compatibility
• Electronic temperature regulation ensures stable, high-contrast performance
• USB-powered and simple to operate for visual and imaging applications

The DayStar Quark Gemini delivers two premium H-alpha experiences in one device, making it one of the most flexible and convenient tools available for high-quality solar observing and imaging.