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 chromosphere details. The chromosphere's 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.

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.

Use Questar OTAs for Solar Viewing    Questar Eyepiece and Rear Port Threads    656nm H-Alpha Filter    21mm Clear Aperture Blocking Filter    Tuned for Chromosphere 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

• Hydrogen-alpha bandpass
• Integrated 25mm blocking filter
• 21mm clear filter aperture
• Tuned to 0.5-0.3Å for viewing chromosphere details
• 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

• 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

• 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

Related Questions and Answers

Q: 1. Can I use this to take practice photos of the sun for the upcoming solar eclipse?

A: Yes, you can use the DayStar Filters 70mm White-Light Universal Lens Solar Filter can be used to take practice photos of the sun, to get ready for photographing the upcoming solar eclipse. https://www.bhphotovideo.com/explora/photography/tips-and-solutions/how-to-photograph-a-solar-eclipse

Q: 2. I Have An F7 102mm Triplet Refractor From Explore Scientific, If I Purchase This HA Solar Filter What Else Would I Need To Purchase

A: The DayStar Filters QUARK H-Alpha Eyepiece Solar Filter inserts into 1.25" or 2" diagonals and accepts 1.25" eyepieces. I recommend using UV/IR cut filters. Follow this link https://bit.ly/3UpqtKg if you are using a diagonal, or https://bit.ly/494r2gU if you are not. The following energy rejection filter is also recommended for optical tube assemblies over 80mm. https://bit.ly/3vYBecc

Q: 3. Looking at the video, there does not appear to be any filter in front on the front element on the telephoto lense. Wouldn't you have to have a solar filter in front to keep from damaging the internal components of the telephoto lens? Should you use a Mylar solar sheet like I normally use for telephoto sun pictures.

A: You are right,it is called ERF(energy reflecting filter). I have ordered one with my Ha filter Aug 3 but has not arrived. So haven't been able to used the Ha filter.

Q: 4. So if you're going to use it on a Canon R6 you'd need two adaptors?

A: All you would need is the Vivitar T-Mount to Canon RF-Mount Adapter. Link to Item: https://bhpho.to/2R13gQg

Q: 5. What do I need to use this with my Canon 5D M4?

A: This is to fit Canon SLR and DLSR bodies. You do not need anything extra for a Canon EOS 5D Mark IV.

Q: 6. What would be the best size for a Nikon 18-200 lens? The current screw-on filter is 72mm.

A: Measure diameter at end of lens with out a lenscap. See specs for this filter and see if it slides over your lens.

Q: 7. DayStar Filters Camera Quark H-alpha Solar Filter for Canon (Prominence): Does this provide product adequate filtration of the sun for the upcoming eclipse, or does it need to be used in consort with additional filters on camera/scope for viewing?

A: The DayStar Filters Camera Quark H-alpha Solar Filter for Canon (Prominence) goes between your lens and camera. You still need a ERF (energy reflecting filter) on the front of your lens. This will prevent damage to the lens. For help choosing a ERF (energy reflecting filter) for your lens email us at sportoptics@bandh.com.

Q: 8. Can I use this to take photos of the sun for practice of the upcoming solar eclipse?

A: Yes. The DayStar Filters 70mm White-Light Universal Lens Solar Filter can be used for solar photography with or without an eclipse.

Q: 9. Is this compatible with Nikon z or Nikon F ?

A: The DayStar Filters Camera Quark H-Alpha Solar Filter for Nikon (Prominence) will work with Nikon F mount lenses,

Q: 10. Can I use this with newtonian telescope using off axis reduction?

A: For the DayStar Filters QUARK H-Alpha Eyepiece Solar Filter (Chromosphere) BH #DADSZ4C • MFR #DSZ4C simply inserts into 1.25" or 2" diagonals and accepts 1.25" eyepieces.