EXCERPT page containing first few paragraphs. 2020-10-26 17:03:52
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This page discusses how to test for a misaligned sensor/lens mount.
The good news for anyone with with a misaligned sensor/lens mount: Nikon service ought to be able to adjust the sensor to lens mount alignment. That’s exactly what I did some years back with my Nikon D800E; it was out of alignment just like this D850 (same symptoms), but when it came back from Nikon the blur problems were gone. I have heard similar experiences from competent readers.
In the case of the bad Nikon D850, the first symptom, one I had not encountered before, was a displacement of infinity focus far beyond the infinity mark and to the mechanical limits of my lenses. That was such a strange behavior that it ought to have occurred to me that something else might be off, and indeed the sensor was also misaligned (not parallel to the lens mount), not just at the wrong distance to the lens mount.
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