Hey guys, I already read this thread a few weeks ago and was really surprised that it is possible to get a view of "only the chromosphere" as long as the bandwidth is small enough, like 0.12A in the paper. I always assumed the calcium concentration in the chromosphere would be too low, so ...

We did use the Baader Herschel Wedge (about 5% reflection = ND1.3) and a Baader ND1.8 grey filter to get in total a blocking of ND3.1. When combined with the solar continuum filter, we have a nice bright solar image that allows us to use short exposure times of only 1ms even at f/21.

Chris

Hi friends of the big spots, while I am still working on my own 100mm triband scope, I had the opportunity to pracise a litte with the really nice 203mm f/7 LZOS Apo from a friend in our local astronomy club. After we observed for quite a while, I only managed to make one video with good seeing befo...