Basler acA1920-155um (IMX174)
Full size Aries tri-band ERF
SS Lunt 35 etalon
2.5x Barlow with red filter (Ha 7nm FWHM)
I found the red filter significantly beneficially boosted the contrast (albeit with a loss of image brightness). Much better with, but I guess it depends on the seeing conditions and the ability to freeze the action.
A little activity in the chromosphere:


These are the best of a dozen SER files.
Thanks for looking.
Stu.