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DayStar Filters

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 bandpassIntegrated 25mm blocking filter21mm clear filter apertureTuned to 0.8-0.6 for viewing prominencesTuning knob allows for 0.5 wing shift for Doppler-shift compensationMarkers at every 0.1 for reference and repeatabilityInternal baffles increase contrastOptical coatings designed specifically for 656nm H-alpha wavelengthLED indicators for power, warming, ready, and faultUse and Handling Built with Questar eyepiece and rear port threadsFor off axis energy rejection filtersBrass compression ring to protect eyepiece from scratchesAccepts 1.25" eyepiecesRecommended OTA Specifications For use with Questar telescopesNo aperture limitationMust use a front-mount energy rejection filter to prevent overheating the OTANot for use with full aperture Schmidt-Cassegrain ERFs - damage to secondary mirror may resultBest performance with f/13 and slower focal ratio OTAsPower 5 VDC, 1.5A micro-USB port90-240 VAC wall adapterSet of international outlet plugs for US, UK, EU, and Australia