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Daystar Filters designed this version of the QUARK H-Alpha Eyepiece Solar Filter specifically for viewing prominences. Prominences, a detail of the chromosphere projected against the blackness of space behind the sun, are seen with improved contrast due to the filter's narrower bandpass versus a wider bandpass filter tuned for conventional chromosphere surface viewing.
This all-in-one hydrogen-alpha filter is engineered to eliminate unnecessary components which reduced the size and weight, and enabled it to fit in a compact form factor that simply inserts into 1.25" or 2" diagonals and accepts 1.25" eyepieces. This design enables the use of nighttime telescopes for solar viewing. In addition to the tunable H-alpha filter, the Quark also functions as a 4.3x Barlow lens, with a 2-element lens system designed to be telecentric which flattens the field of view and reduces parallax, and optical coatings that are optimized for the 656nm H-alpha wavelength.
While there are no OTA aperture limitations, Daystar recommends the use of UV/IR cut filters or front-mount energy rejection filters on OTAs over 80mm of for long-duration solar viewing sessions. For best results, they suggest using refractor-style scopes with focal ratios between f/4-f/8, and you can enjoy full-disk viewing with focal lengths up to 450mm. The filter is powered via a micro-USB port, and Daystar includes a power cord and an AC adapter to meet the high-power requirements of 5 VDC 1.5A. To enable its use at home and abroad, a set of international outlet plugs is provided with adapters for the US, UK, EU, and Australia.
Integrated 12mm blocking filter
21mm clear filter aperture
Tuned to 0.8-0.6Å for viewing prominences
Tuning knob allows 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
Integrated 4.3x 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
Recommended OTA Specifications
No aperture limitation
Best performance with f/4-f/8 refractors
Full-disk viewing on refractors up to 450mm focal length
For apertures over 80mm (3.1"), or for long-duration solar viewing, an UV/IR cut filter should be used for energy rejection
Not suited for off-axis applications
5 VDC, 1.5A micro-USB port
90-240 VAC wall adapter
Set of international outlet plugs for US, UK, EU, and Australia
In the Box
DayStar Filters QUARK H-Alpha Eyepiece Solar Filter (Prominence)