• DayStar Quantum Calcium II H 5 angstrom solar filter CH5AUNI ideal for serious and advanced astronomers providing a precise specialized and high performance calcium H light solar filter solution for observing solar chromosphere fine surface detail chromospheric network calcium bright points solar plage regions and solar activity in unique and scientifically rich calcium H light for advanced sun viewing and solar photography — Telescope Wolves
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Daystar

DayStar Quantum Calcium II H-Line 5Å Solar Filter — Observe Solar Plage and Active Regions in Calcium H-Line Light

DayStar Quantum Calcium II H-Line 5Å Solar Filter — Observe Solar Plage and Active Regions in Calcium H-Line Light

$13,990.00
$13,990.00
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Calcium II H-line imaging at 396.8nm provides a fundamentally different view of solar chromospheric dynamics than H-Alpha. At this wavelength, calcium emission traces the magnetically active network and plage regions with exceptional sensitivity — revealing the magnetic skeleton of the photosphere in a way H-Alpha cannot. The 5Å bandpass resolves chromospheric emission while blocking the bright photospheric continuum, making it ideal for plage mapping, active region correlation studies, and multi-wavelength solar imaging programs. Ca II H is used by professional observatories worldwide and is now accessible to serious amateurs with a dedicated solar setup. Note: requires a telescope whose optics transmit well in the near-UV. ERF required. Ships free to the US.

Specifications
SKU CH5AUNI
Wavelength Ca II H-line (396.8nm)
Filter Type Fabry-Pérot etalon (electrically heated for thermal stability, electronically tunable)
Bandpass (FWHM) 5Å — chromospheric emission resolved; photospheric continuum blocked
Best For Plage mapping, chromospheric network, active region studies, multi-wavelength programs
Wavelength Display Live LCD readout, accurate to 0.1Å
Tuning Electronic wavelength control
Power 12VDC (100–240VAC supply included with US, EU, UK, and AU adapters)
UV Transmission Note Telescope optics must transmit in the near-UV (396.8nm); many achromats and cemented objectives have reduced throughput here
ERF Required Yes — front-mount Energy Rejection Filter required; sold separately
What's in the Box Quantum Ca II H-Line 5Å filter, 100–240VAC power supply with international adapters (US, EU, UK, AU)
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Frequently Asked Questions

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