Hi there.
I have a loan of the subject telescope from Testar.
Got things reasonably dialled in, although the mount needs additional work.
Ok, its only M42/NGC 1977 but it's
also only 5 x 5 min subs.
https://www.martinpughastrophotography.space/m42ngc1977
Taken with a One Shot Colour camera (not a QHY, hint). Antlia filters (jury still out).
As for the scope: What I like:
Very nice optics
Built in camera rotator.
Solid R&P focuser - Controlled by a Prima Luce Sesto Senso2
What I am not sure about.
There is a single thumbscrew that holds the drawtube in place. Its not such much as a lock as it bears down on sort of delrin shim, so it acts like a clutch. You have to find the sweet spot with this. If you leave it too loose, the focuser assembly and therefore your camera is also a bit loose so you will no doubt get some sag and image tilt. Too tight, and perhaps the electronic focuser may struggle to lift the camera package. That said, it didnt take much to find the sweet spot.
What I dont like:
Well, like EVERY other refractor made of aluminum, cool down is critical so focus changes quite a lot until it equalizes with ambient.
cheers
Martin