I recently purchased a Telescope Service (Sharpstar) Parabolic Imaging Hypergraph, 200mm F3.2 with a 4 element corrector in the focuser. Here is the Rosette nebula taken on February 22, 2020. I present 2 versions, one showing the OIII component well, and the other bumping up the Hydrogen Alpha. I was able to process it with a 3-D effect looking inside, this came at the expense of the background being a bit wonky. Collimation was slightly off, but is sure didn't hurt the detail. Sony A7s cooled and modified, OPT QUAD filter, stack of 25 - 72 second subs.