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Image tilt could be caused by poor initial collimation, or it may be caused by flexure of the optical train due to the weight of the paracorr/camera (so ruining your collimation after the fact). In my case it is the latter: I have an STL-11000M which is too heavy for my 2" focuser (esp. when pointed near the meridian). I would say that you need to first ensure that you have good initial collimation before looking for other causes. How much does the QHY8 weigh? ..and what focuser are you using?
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