More products from the brand :DayStar

DayStar Quark GEMINI "Two in one" - Chromosphere and Prominence in the same Quark

CHF 2'380

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DayStar QUARK Gemini - Hydrogen-Alpha Eyepiece filter

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.

Why QUARK Gemini?

Two separate Fabry-Pérot standards integrated in the same ocular housing (Prominence wide >0.6Å and Chromosphere narrow <0.5Å).
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.
No need for additional adapters or refocusing - everything is integrated into a lightweight, compact device.
Perfect for educational demonstrations or time-saving comparative imaging.

Amateur astronomers and teachers can simultaneously show the differences between surface and protuberances, while astrophotographers can quickly capture comparative images.

Product summary

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.

Technical specifications

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

Prominence / Chromosphere comparison (integrated into Gemini)

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.

Box contents

QUARK Gemini (Prominence & Chromosphere)
Snouts 1.25″ and 2.0″ with coder
Brass clamping ring
Mains adapter 90-240 VAC
Pelican-style case for transport and protection
Documentation & 5-year warranty
Optional: 8h battery pack

Quick FAQs

Can we show both Prominence and Chromosphere?

Yes - simply slide the side arm to switch from one to the other instantly.

Is it safe for direct observation of the Sun?

Yes, when used according to the manufacturer's instructions and with a stable mount.

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