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The filter performs better with a narrower bandpass with the 4
Quality Achromat Doublet 60mm refractor
and weighs 3
The Quark contains a custom Daystar Instruments 4
Quantum Calcium II K 2Å PE Combo Quark The filter performs better withDaystar Calcium K line Quantum Filters 2. 0 suitable for academic purposes. Ideal application: CCD photography or indoor visual viewing environment. Traditionally, university research has employed the Calcium K line for studies of Calcium on the Sun. These studies have been instrumental in determining depth of the solar atmosphere. Calcium offers TWO strong absorption lines at 393. 3nm and at 396. 9nm, known as the K and H lines. Researchers have
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