I just bought a (new to me) SW 200P Quattro. I have a moonlite focuser and an ASI 294 MC Pro mounted. I took my first images a few nights ago.
To check the tilt and the collimation etc., I ran the images through CCD Inspector. I also have a RASA 8 so I'm fairly familiar with tilt issues.
To my surprise, CCD inspector said there was quite a lot of tilt (or sag) in the image. Please see the attached images. If it was my RASA, I would say it's a back focus issue.
I have train at the 90 degree point because I use a polemaster and if the train is vertical, it blocks the PM.
However, the back focus is exactly 55mm from the CC, I'm using the SW coma corrector. So, the train is a Moonlite focuser, the Sky Watcher coma corrector, three zwo spacers equaling 48.5mm and then the camera (6.5 mm).
The image posted below has no processing whatsoever...no calibration frames...nothing just a raw stack in APP.
Let me know what you think....I don't know the first thing about newts.