D800 Serial # 3053xxx, Should I send it back?

Started Nov 10, 2012 | Discussions thread
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Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 11,355
Re: Agreed
2

Will1 wrote:

The proper methodology for testing a D800 for "the dreaded left AF issue" is well known. You're not using it.

Agreed.

Outer AF points are vertical - and there is no vertical detail in the rope for AF to detect. Cenrtal AF also detects horizontal AF - and there is horizontal detail - which is the likely reason for the sharpness difference

The circle is a small symmetrical pattern which page 100 of your D800 instructions cautions may cause AF error. Central AF reads horizontal and vertical so has 2 chances to be good compared to 1 for an outer AF point, plus central AF is generally more accurate as it has f8 detection ability to Nikon's minimum standard.

I expect if you use better for testing targets your AF is likely to be good.

For what it is worth I make it another 90 posting images at dpreview did not use a target Will1 (or Nikon) would be happy with, and none so far seem to have tested in a way likely to confirm their body has an AF problem.

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Leonard Shepherd
Many problems turn out to be a lack of intimate knowledge of complex modern camera equipment.

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