DayStar QUARK for Questar PROMINENCE Solar Filter

Designed specifically for Questar telescopes, but similar to their standard Quark, Daystar Filters’ Questar Quark H-Alpha Eyepiece Solar Filter is outfitted with Questar-specific eyepiece and rear port threads to install quickly and easily, without adapters, directly into your OTA.

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 threads onto either port and accepts standard 1.25″ eyepieces. It is tuned 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.

While there are no OTA aperture limitations, Daystar recommends the use of front-mount aperture-reducing off-axis energy rejection filters. 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.

Filter Properties :

Hydrogen-alpha bandpass
Integrated 25mm 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
Internal baffles increase contrast
Optical coatings designed specifically for 656nm H-alpha wavelength
LED indicators for power, warming, ready, and fault
Use and Handling
Built with Questar eyepiece and rear port threads
For off axis energy rejection filters
Brass compression ring to protect eyepiece from scratches
Accepts 1.25″ eyepieces
Recommended OTA Specifications
For use with Questar telescopes
No aperture limitation
Must use a front-mount energy rejection filter to prevent overheating the OTA
Not for use with full aperture Schmidt-Cassegrain ERFs – damage to secondary mirror may result
Best performance with f/13 and slower focal ratio OTAs
Power
5 VDC, 1.5A micro-USB port
90-240 VAC wall adapter
Set of international outlet plugs for US, UK, EU, and Australia