EXCERPT page containing first few paragraphs. 2020-11-29 21:27:24
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Update: a 2nd sample of the D850 did not show this kind of awful alignment issue, but it did show the same flange focal distance error making lenses focus well beyond the infinity mark.
This page shows examples of what a misaligned sensor can do to images. With a high resolution digital sensor, the sensor and the lens mount flange must be perfectly parallel, or the image will be “swung” or “tilted” or both, using that view camera terminology.
The following two blog posts go into the background for this issue, which was found with a brand-new Nikon D850 loaned by a reader.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
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