I have on loan from Vanderbilt University an
Isle of Man Solarscope SF-100, mounted on
a TeleVue NP-101 refractor (540mm focal
length). I plan on comparing the very
expensive Solarscope SF-100 filter to a
SolarMax60/BF10 on a Televue Pronto, and
a SolarMax90/BF15 on my AP155EDF.
Here are some early images with the
SF-100, taken today late morning after a
good bit of ground/observatory heating.
1350mm focal length.