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Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Daystar Quantum Helium D3 Solar Filter - 0.3Å PE Grade

Daystar Quantum Helium D3 Solar Filter - 0.3Å PE Grade

by Daystar Filters
SKU DAY-HeD.3PE
$0
$17,995.00 USD - $17,995.00 USD
$17,995.00
$17,995.00 USD - $17,995.00 USD
$17,995.00 USD
Availability:
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0.3Å PE Quantum Solar Filter, Helium D3 line. For use with refractors, SCTs, Maksutovs. Includes front and rear plates, power supply, instructions, and hard case. Requires UV/IR cut filter, plus Powermate barlow or stop down mask to reach F/27-F/35 focal ratio for best performance (sold separately).

DayStar is proud to offer the only Helium D3 Solar Filter available on the market today. Due to our recent advancements in technology which allow more precise tuning of a DayStar filter, we are finally able to capture the Helium emission line.

Discovered in the visual spectrum at 5875.61Å nearby Sodium D1 and D2 lines by Pierre Janssen in 1868 during a solar eclipse, Helium is the second most abundant element in the Universe.

Research studies in D3 in the past have focused on flare research and comparisons of correspondence of absorption in D3 with Magnetic Lines. Those studies used 'overlapograms', as He D3 filters have not been available before today.

Features visible in D3 are: Sunspot Detail, SuperGranulation, Plague, Emission in Flare Footprints, Absorption following Magnetic Lines and small prominences.

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