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Hi Erik
The first picture looks reasonable. The diffraction spikes on that star show you are close to it but you will need to do a full star test collimation to look at the diffraction rings at high magnification. Then tackle the other problems. The vignetting could be due to the long path through the OAG and focuser.
Trevor had a similar trouble with elongation in a part of the photo and it was found to be a slightly tilted focal focal plane as I said earlier.
Barry
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