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EXCERPT page containing first few paragraphs. 2017-12-16 14:36:56
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Nikon Quality Control: Misaligned Sensor Examples

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.

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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.

  • Make better images by learning how to get the best results right away.
  • Save money by choosing the right lens for your needs the first time, particularly some of the new Sigma Art lenses vs Nikon and Canon.
  • Workflow discusses image organization, raw conversion and post processing. Many examples show processing parameters for direct insight into how the image was converted.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops [past 2 years or so].
  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Nikon or on Canon or on Pentax.

f2 @ 1/200 sec, ISO 64; 2017-09-30 17:26:51
NIKON D850 + Sigma 85mm f/1.4 DG HSM Art

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