DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)

DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)

DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)

DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)

DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)

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Expected availability: 7-14 business days

Product Highlights

  • Use Questar OTAs for Solar Viewing
  • Questar Eyepiece and Rear Port Threads
  • 656nm H-Alpha Filter
  • 21mm Clear Aperture Blocking Filter
  • Tuned for Prominence Viewing
  • ±0.5Å Wing Shift Tuning
  • For Questar Telescopes up to F/3
  • No OTA Aperture Limitations
  • 5 VDC, 1.5A micro-USB Port
  • Optional Off-Axis ERFs Required
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  • 1Description

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
  • 5 VDC, 1.5A micro-USB port
  • 90-240 VAC wall adapter
  • Set of international outlet plugs for US, UK, EU, and Australia
UPC: 702730991022
In the Box
DayStar Filters Questar Quark H-Alpha Eyepiece Solar Filter (Prominence)
  • Wedge Adapter
  • Quark H-Alpha Filter
  • Plastic Case
  • USB Power Cord
  • Wall Outlet Power Adapter
  • Set of International Plug Adapters
  • Limited 10-Year Warranty
  • Table of Contents
    • 1Description
    Type Hydrogen-Alpha
    Filter Factor 0.8 - 0.6 Å
    Blocking 25 mm, 21 mm clear aperture
    Application Prominence viewing
    Size Questar eyepiece and rear port thread
    Accepts 1.25" eyepieces
    Multi-Coated Yes
    Power Requirement 5 VDC, 1.5 A
    Construction Aluminum alloy
    Dimensions 5.7 x 2.8 x 2.2" / 14.6 x 7.1 x 5.5 cm
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