Saturday, 20 April 2019

CaK Full Disk 19th April

Stopping the ED60 down to 40mm to reduce spherical aberration was definitely a good idea, and with excellent conditions the resulting disk is better than i've got in previous days.  I still don't think it has the sharpness of my 40mm f10 scope, but the results are acceptable.  Taken using the home brew CaK filter, 2x Cemax barlow and FLIR GH3 ICX814 camera.  The disk shows nicely the activity about to pass over the limb, there were signs of a possible emerging flux region that developed in equatorial regions but this doesn't appear to have developed into anything overnight.