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Old 18-09-2019, 07:52 AM
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Merlin66 (Ken)
Spectroscopy Wizard

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New Solar CaK filter assembly

Just completing a new CaK 2A filter assembly.....
This version is based on a 2" Baader Blue CCD filter as an "ERF" give a good UV cut below CaK (393nm) and above about 520nm.
Then follows a #1 "Yellow" filter removed from a CaK PST. This has a bandwidth of 2A centred on CaK.
The third element is an Omega 2A CaK filter (as a double stack)

The initial results look promising...
bright speckles show the narrow bandwidth!

I need to consider whether or not at add a tilter to each or either of the 2A filters to fine tune the CWL.
Used with a stopped down ED80 (60mm f10) and ASI 1600MM.
Firecapture, AS3!, ImPPG, Corono
Onwards and Upwards.
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Old 18-09-2019, 08:11 AM
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h0ughy (David)
DOGHOUSE REBORN

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Awesome results. Would you use a tilter like the zwo one?
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Old 18-09-2019, 08:43 AM
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Merlin66 (Ken)
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David,
Thanks!

The ZWO tilter is ideal for removing Newton Rings but not for dynamic narrow band filter tilting.
I'm lucky enough to have a couple of SkyBender filter tilters. These units allow a full degree of freedom and are pretty repeatable.
To be honest, it really needs the spectrograph, with resolution around 0.05A to accurately determine the CWL and and bandwidth.
The differences between H alpha and CaK are shown below.
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