While I have a few theories about why the UV, through glass, looks the way it looks, I’ll leave the theory out.
Also, I updated the filterwheel’s firmware. If you are wondering why it’s not on github, wonder about microsoft a bit.
One can see how limb darkening is truly stronger in the blue end of the spectrum, and that for most intents and puproses, the Calcium K yields the second best amount of detail, after the… hydrogen alpha. The solar continuum is, comparatively, useless for full disk images.