CaK Full Disk 18th February

At first glance there is not much happening in this full disk in terms of activity, but when you look closer near the south eastern limb it is possible to see the dark thin line of a filament.  When I saw this in Ha light it was very dark, and this along with excellent transparency seems to be one of the key things to seeing them in CaK wavelengths.  Taken with the 40mm scope at 700mm focal length with the PGR Blackfly GigE IMX249 camera and homebrew CaK filter.