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Yep having a PME means you can accurately do a meridian flip and only lose a couple of pixels at the edges of the image.
That said, this is quite a nice version of the trifid. Good colours and quite smooth processing.
Just one question though. Why do you have round stars in the top left of the image and all the way around in the other corners the stars have some elongation? Are you using a reducer or flattner? Does the QHY9 have a tilt problem? I see this a lot with images taken with these cameras and wonder is the sensors are not square to the line. It is a minor thing but still getting round stars is the goal of most astorphotographers I would think. Your thoughts Doug?
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