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
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