Quote:
Originally Posted by Averton
Thanks Dennis.
Yes the wavelength of Calcium K is 393.4nm. However, we don't refer to our images as CaK as that is normally used to refer to images taken with a etalon based filter which is sub nanometer narrow. The filter we use is just a coating filter of 3nm bandwidth so is too wide to obtain genuine CaK images. Our filter is made by Antlia. Baader make a similar filter and call it K-line. At 3nm the photosphere still shows through, but we have found it does enhance the plain photosphere images that you get with a solar continuum filter at 540nm. It particularly enhances the faculae.
Having two of us certainly helps with the processing of our image data. We just enjoy our astronomy and particularly solar imaging  |
Thanks for those details.
Cheers
Dennis