DayStar Calcium II K-line Quantum Filter - University

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DayStar Calcium II K-line Quantum Filter - University
Item # DF-C2K-U
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  • DayStar Calcium K-line Filter assemblies are suitable for academic purposes and University settings.
  • Designed for with CCD photography or indoor visual viewing environment.
  • DayStar Calcium K-line Filter is a 2.0 single cavity visual series filter system.
  • Additional neutral density solar film suggested on apertures above 150mm or for long-term dedicated applications.
  • Pre-order required and 6 month filter production time.


Daystar Calcium II K-line Filter - University Series

DayStar is proud to offer Calcium H ( 3969Å ) and two Calcium K-line (3933.7Å ) filtering systems. 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 previously avoided the H line for academic research, as it is very close to the Hydrogen Epsilon line. For purposes of clarity in isolating Calcium, and because imaging sensors offer similar sensitivity to the K as the H lines of Calcium, the K has to date been the target of choice in Calcium filters.

However, as the visual spectrum ends at approximately 400nm, the further we venture below this wavelength, the more difficult it is for observers to visually see the image. The H line for visual observations, is much closer to the visual spectrum and easier to see in high contrast blue color. Some observatories have been imaging in Ca II K line, such as the Dutch Open Telescope image you see here (DayStar 2.0 Å Calcuim K-line filtergrams taken June 8, 1982 with a 125mm aperture telescope at 3000mm prime focus) with outstanding results.

DayStar's new Quantum controls on Calcium II K line are perfectly suited for academic studies in mapping the 3-dimensional structure of the Chromosphere. By controlling wing shift of the Ca II K line filter with precision accurate to 0.1Å, studies can depict intensity differences between the K3, K2 and K1 lines. Observation of the complicated structure of subordinate peaks offer views through different levels in the solar atmosphere.

* Note. Calcium H and K-line filters do not require F/30 configurations. They may be used at F/15 or F/20. They also do not use the same RED or Yellow glass Energy Rejection Prefilter. Rather, we recommend dielectric "hot mirror" UV/IR cut filters introduced prior to focus. Additionally, we suggest an additional neutral density solar film on apertures above 150mm or for long-term dedicated applications.

DayStar Product Number: C2K-U

Until recently, these specialty filters were the domain of scientists only. Since each DayStar Calcium II K-line Filter must be individually produced, they must be pre-ordered and a minimum of 6 months must be allowed to fulfill the order. Please contact our expert sales staff for further ordering information. Thank you!
Additional Information

Additional Information

Aperture 100mm
Emission Line Calcium-K
Bandwidth Calcium K-line (3933.7Å )
Blocking Filter Included Sold Separately
Best for Focal Lengths of... f/30 or Under
Blocking Filter Barrel Size 1.25"
Manufacturer DayStar
Warranty 10 Year Warranty
Wavelength 2.0 Å
Tuner Included? Yes
Included Items

Included Items

  • DayStar Calcium II K-line Quantum Filter - University
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