Two views of German amateur Percy Zahl's Schiefspiegler (closed construction).
Amateur Georg Dittie's instruments, a 150 mm Schiefspiegler (open construction) compared to a 150 mm refractor.
The finely crafted Schiefspiegler of Michael Brunn of Hoxter, Germany. The aperture of this scope is 125 mm and works at f/28.
Michael is also designer and patent holder for Tetra-Schiefspiegler constructions.
Thanks to David Stevick for providing the images and information.
The 200/4000 mm Schiefspiegler of Stefan Schimpf. Note: The guiding refractor is a 5-inch, the Schief an 8-inch scope!