Tuesday, 11 March 2014

CaK Full Disk 9th March

CaK-full-disk-bw by Mark Townley
CaK-full-disk-bw, a photo by Mark Townley on Flickr.

Sunday dawned with lovely blue skies and so I was keen to try out the latest embellishment of my homebrew CaK filter: Previous imaging runs had revealed problematical reflections and I had introduced some Schott BG25 glass in between the reflective elements of the filter train. This worked well in removing the reflection and generally increasing the contrast to the point the proms were fairly easily visible at CaK wavelengths.