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DAYSTAR QUARK GEMINI Chromosphere/Prominence Switchable Filter
Ideal for those who do not want to have to choose what part of the sun they can optimally view, the Daystar Filters QUARK Gemini H-Alpha Switchable Chromosphere/Prominence Eyepiece Solar Filter is unique in its ability to view both the chromosphere and prominences.
The sun’s chromosphere (surface) structure behaves differently in active regions than quiet areas, where magnetic field lines are stronger, so viewing this portion of the sun provides a constantly changing observational experience. By contrast, prominences—details of the chromosphere projected against the blackness of space behind the sun—are seen with improved contrast. Since the bandpass requirements to view these separate features are different, two different etalons are required, so Daystar uses a push-pull etalon changer system that allows you to quickly and easily choose and change the filter without having to remove or power down the entire unit.
Filter Properties:
- Separate individual Fabry Perot etalons allow a single unit to view both prominences and the sun’s chromosphere (surface)
- Change etalon using a simple slider, no need to change gear or refocus OTA
- <0.5Å bandpass etalon is used for viewing the chromosphere
- >0.6Å bandpass etalon is for viewing prominences
- 656nm hydrogen-alpha filter
- Integrated 12mm blocking filter
- 22mm clear filter aperture
- Tuning knobs allow for ±0.5Å wing shift for Doppler-shift compensation
- Markers at every 0.1Å for reference and repeatability
- LED indicators for power, warming, ready, and fault
Optics:
- Integrated 4.2x Barlow lens
- Lens and optical coatings designed specifically for 656nm H-alpha wavelength
- Two-element telecentric lens design keeps light waves parallel to flatten the field of view and reduce parallax as magnification increases
- Fits into both 1.25″ and 2″ focusers, drawtubes, and accessories like diagonals
- Standard 1.25″ holder with brass compression ring to protect eyepiece
- Optional 2″ and SCT adapters available separately
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