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Reporting back, I tried extending the distance between the DSLR and the AT2FF by using 3D-printed spacers and hand-holding the DSLR. Tricky but doable for short exposures.
I gradually increased the distance by up to another 13mm and the images did not show improvement. No idea what is wrong with the AT2FF, luckily I did not pay much for it.
It looks like I will be getting the Orion flattener in the end.
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