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Nikon D800
Nikon D800

Autofocus AF-S Accuracy: Nikon 85/1.4G, 85/1.8G (Mosaic)

The Rodin AF-S focus with fine focus adjust page showed serious autofocus errors with a 3D subject and the 85/1.4G. The AF-C mosaic test also showed substantial errors with both the 85/1.4G and 85/1.8G.

This page shows both the Nikon 85/1.4G and 85/1.8G.

Here we throw the D800 a bone, and give it a subject with no 3D challenge at all— a flat surface. Along with AF-S single shot mode with AF-S priority selection = Focus. AF Fine Tune = 0 was used for this test. Test protocol is detailed at the bottom of this page.

We are actually interested in several ideas here:

  1. Does the D800 focus accurately and consistently using its center AF focus point?
  2. Is there a difference in focus accuracy and consistency off-center?
  3. Is there a difference using focus points on the left versus right?
  4. Is there a difference between the 85/1.4G and 85/1.8G?
  5. Is contrast-detect autofocus fully accurate?

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Rough visual of the Nikon D800 autofocus point layout as used for the test; Nikon 85mm f/1.4G
Rough visual of the Nikon D800 autofocus point layout as used for the test
Nikon 85mm f/1.4G

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