I must admit, today is the first time I have ever looked at anything with
a decent scope. A store in Tucson AZ had an old AP refractor,
4 or 5 (or 6?) inches, aimed at the sun for customers. They used a TV 55mm
plossl. Not a lot of magnification, but it was a joy looking at the
prominence.
I always figured that a prominence would move rapidly, but it just stood
there, suspended. She said it took like 8 minutes before you can notice a
change. Some people have said that solar observing can be hazardous to
your scopes health. They were doing it with an AP!!

I didn't take the time to find where the filter was located. Do you think
it
was the eyepiece, or on the top of the scope? Hmmm. -Tom