Sunday, 18 June 2017

AR12663 in CaK - 17th June

This is by far the most active region on the sun at the moment, with it's trailing wake of plage.  There were just about some nice details visible in this shot taken with the 100mm Tal100R stopped down to 80mm using a Beloptik Tri-Band ERF, home brew CaK filter and the PGR Chameleon 3 camera.