Thursday, 19 June 2014

CaK Full Disk 18th June

There was plenty to see in CaK wavelengths on yesterdays sun, I managed a quick view after work when the skies cleared.  This was the first time I got to test my UV polariser in the filter train in an attempt to cut the reflections / ghosts in the system.  This was placed between the 2 K line filters and rotated; it was clear that this was cutting the reflection that was offset off the field of view, admittedly at the expense of taking some light from the system (longer exposure!), but, I was thinking about going for a blocking system with more light throughput anyway, so this may force this a little quicker than I was thinking already