DayStar Calcium Line Solar Filters.

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
violet color. Some observatories have been imaging in Ca II H line, such as the Dutch Open
Telescope with outstanding results.

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.

5.0Å Single cavity visual series filter system.
Suitable for amateur and University settings - for visual and photographic, indoor or outdoor
observing settings.

Price - £2507.00 + £10.00 Shipping & insurance.

DayStar Calcium K-line Quantum Filters
2.0Å Single cavity University series filter system.
Suitable for academic purposes - Ideal application: with CCD photography or indoor visual
viewing environment

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.

Price - £3365.00 + £10.00 Shipping & insurance.

The Astronomy Shop

1 Tone Hill. Wellington

Somerset TA21 0AU

United Kingdom

Telephone: +44 (0)1823 665510