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Daystar  |  SKU: DSZCH

DayStar Filters Calcium QUARK Ca H-Line Eyepiece Solar Filter

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DayStar Filters Calcium QUARK Ca H-Line Eyepiece Solar Filter



  • 3968.5Å, 25mm Blocking Filter
  • Use Astronomical OTAs for Solar Viewing
  • ±0.5Å Wing Shift Tuning
  • Optical Coatings Tuned to Calcium H-Line
  • Use with f/7 to f/30 Refractor OTAs
  • No OTA Aperture Limitations
  • Rear-Mount UV/IR Cut Filters Recommended
  • 5 VDC, 1.5A micro-USB Port


Daystar Filters' Calcium QUARK Ca H-Line Eyepiece Solar Filter departs from traditional K-line tuned filers and focuses on the 396.9nm H-line wavelength. This wavelength is closer to the visible spectrum and is therefore easier to see - especially older users who have trouble seeing the K-line. When using the filter for imaging the sun, H-line provides improved quantum efficiency, higher glass transmission, and improved performance from anti-reflection optical coatings. H-line also offers slightly more visible features due to the hydrogen contribution. Views through the filter show the chromosphere, plages/faculae, sun spots, and solar flares in a vibrant violet color with high-contrast.

While there are no OTA aperture limitations, Daystar recommends the use of rear UV/IR cut filters for long-duration solar viewing sessions, or OTAs larger than 80mm (3.1"). For best results, they suggest using refractor-style scopes with focal ratios between f/7-f/30, and you can enjoy full-disk viewing with focal lengths up to 1800mm.

This all-in-one filter design enables the use of nighttime telescopes for solar viewing, and is engineered to eliminate unnecessary components which reduced the size and weight. This streamlined form enables it to simply insert into 1.25" or 2" diagonals and accepts 1.25" eyepieces. 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

  • Tuned to calcium H-line 3968.5Å wavelength
  • Use to view chromosphere, plages/faculae, sun spots, and solar flares
  • Integrated 25mm blocking filter with a 19mm clear filter aperture
  • Tuning knob allows for ±0.5Å wing shift for Doppler-shift compensation
  • Markers at every 0.1Å for reference and repeatability
  • Optical coatings are engineered for the Ca H-line 397nm wavelength
  • Internal baffles improve image contrast
  • Operating temperature range: 0 to 100°F (-18 to 38°C), ambient outside temperature
  • LED indicators for power, warming, ready, and fault

Use and Handling

  • Standard configuration: 1.25" snout with a 67mm backfocus
  • Adapters for adjusting backfocus: 2" front snout with a 61mm backfocus, 1.25" front snout with a 99mm backfocus
  • Accepts 1.25" eyepieces and astrophotography adapters/accessories

Recommended OTA Specifications

  • No aperture limitation
  • f/7 to f/30 refractor OTAs in full aperture
  • Full disk viewing on refractors with a focal length up to 1800mm
  • Rear UV/IR cut filters recommended
  • Not compatible with red or yellow glass energy rejection filters
  • Short focal ratio refractors will need an optional 2x or 2.5x Powermate for best performance


  • 5 VDC, 1.5A micro-USB port
  • 90-240 VAC wall adapter
  • Set of international outlet plugs for US, UK, EU, and Australia


Why H-Line?

Many astronomers fail to remember that the Calcium H-line and K-line offer nearly identical solar views. Researchers who use CCD cameras exclusively to image the Sun often select the K-line for the purposes of pure research. Unfortunately, with Calcium K-line filters, many older astronomers are not able to see the lower wavelength and thus are excluded from all the fun. Daystar provides higher wavelength Calcium H-line filters for visual observers in order for Calcium to be enjoyed by most users.

  • Works with f/7 or longer focal ratio refractor telescopes and requires a UV-IR filter on the unit for anything between 80mm and 130mm.
  • User does not need to be concerned with configurations. Simply insert your diagonal, add an eyepiece, and observe. Please keep in mind that the Calcium-H Quark does not have a built-in telecentric Barlow like the H-alpha models do. Therefore, you will need to provide your own means for reaching f/30.
  • Correct filter bandpass will be determined by the final telescope application. There is no specific designated FWHM bandpass, but it will be approximately 5Å. Fully enhanced design removes any adapter requirement. All of this is loaded into one lightweight eyepiece-sized device.
  • Due to Daystar's new compact design, superfluous components are eliminated, reducing weight and associated costs. Power consumption has even been reduced.
  • The Calcium Quark does not work with front mounted energy rejection filters (ERFs). For safety, the Daystar Calcium H-Line Quark is recommended for use with a UV/IR cut filter. Users will need to purchase an ERF unique to their telescope to ensure safe operation. The Calcium Quark can NOT be employed with front mount ERFs.
  • Baffles are included to enhance contrast, while AR coatings are augmented for the 397 nm wavelength.

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DayStar Filters Calcium QUARK Ca H-Line Eyepiece Solar Filter | DSZCH | 702730991091

DayStar Filters Calcium QUARK Ca H-Line Eyepiece Solar Filter






Focal Length


Focal Ratio


Field of View




Barrel Size



3.6 x 2.8 x 2.2" / 9.1 x 7.1 x 5.5 cm


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