CHF 2'380
In stock with supplier
Turn your refractor into a safe, portable solar telescope. The QUARK Gemini is a true "two-in-one". It simultaneously contains Prominence and Chromosphere with instant glide to switch from one to the other, without changing eyepieces or refocusing.
Amateur astronomers and teachers can simultaneously show the differences between surface and protuberances, while astrophotographers can quickly capture comparative images.
The QUARK Gemini is an all-in-one H-alpha eyepiece for refractors (F/4 to F/8 ideal), combining 4.2× telecentric Barlow optimized for 656 nm and two switchable Fabry-Pérot standards for Prominence and Chromosphere. Includes 1.25″ & 2″ sliders, USB power supply, tuning control and built-in protection.
| Type | Eyepiece H-alpha Gemini - switchable double standard |
|---|---|
| Models | Prominence & Chromosphere integrated, slide-action |
| Integrated Barlow | 4.2× telecentric, optimized for 656 nm |
| Clear aperture | 22 mm |
| Blocking filter | 12 mm integrated |
| Eyepiece outlet | 1.25″ standard; 1.25″ & 2″ snouts supplied |
| Power supply | USB 5 V 2 A. 90-240 VAC mains adapter included |
| Control | Two +/-0.5 Å tuning wheels with detents every 0.1 Å, status LED |
| Warranty | 5 years |
| Optimum use | f/4 - f/8 refractors; full disc up to ~450 mm focal length |
| Consumption | Low - compatible with optional 8h battery pack |
| Criteria | Prominence | Chromosphere |
|---|---|---|
| Bandwidth FWHM | Wider (>0.6Å) → brighter | Narrower (<0.5Å) → better surface contrast |
| Filaments (on disc) | Difficult to see | Visible and detailed |
| Protuberances | Very bright, with a limb | Visible, but less brilliant |
| Detail contrast | Less contrast, brightness priority | High - ideal for chromospheric detail |
| Recommended use | Rapid visual observation of protuberances | Astrophotography and detailed surface observation |
With Gemini, you can instantly switch from one to the other according to your needs, without having to change equipment.
Yes - simply slide the side arm to switch from one to the other instantly.
Yes, when used according to the manufacturer's instructions and with a stable mount.
