Tuesday, 24 September 2013

CaK Full Disk 22nd September

ds cak full disk colour by Mark Townley
ds cak full disk colour, a photo by Mark Townley on Flickr.

Even on a relatively quiet day on the Sun as it was as we passed into autumn there is still plenty to see in CaK wavelengths. This was another outing for the double stack CaK filter, which had been redesigned in its configuration to remove the reflections and ghost images that were present when i first set it up. It is performing very well now with only minimal ghosting at the bottom of the disk which should be fairly easy to remove with a bit of tilting. This was taken with the 40mm @ f20 with the DMK31 camera.