I have the Sky-Watcher version of the Orion Mak-Newt.
I've only ever taken one comet picture and it was done with that scope:
The camera was an SBIG STF-8300M with RGB filters. So not really an ideal camera for comet catching. But the scope itself worked pretty good. The image shows the comet as being sort of elongated with a dark band in the middle. I think that's because I used DSO long exposure techniques and the comet moved a bit during the imaging session.
The stars came out pretty round though, which brings up another point: you do not need a coma corrector or flattener with this scope. The Mak-Newt design incorporates one in the meniscus lens at the front of the scope.
For its size, the MN190 is heavy though. It was too heavy for my NEQ6 and this image was done with it mounted on an EQ8. Compared to a Newt, it is nose heavy. The meniscus lens up front is a mighty hunk of glass. The weight distribution may or may not help things, depending on your setup.
Edit: One other thing about the Mak-Newt design is the lack of diffraction spikes. This may or may not be a positive thing, depending on how the viewer feels about spikes.
Edited by David_Ritter, 04 January 2018 - 08:44 PM.