D800 Left AF UK repair experience

Started Feb 27, 2013 | Discussions thread
MOD TOF guy Forum Pro • Posts: 14,446
Re: Or does it

Leonard wrote:

Using the letter F as a subject neither side is likely to focus good if covering only the vertical part of letter F. If lined up slightly to the right of the letter F the left AF can usually focus the horizontal direction parts of the letter, and the right cannot. Reverse the F, line up slightly to the left and the right can usually focus and the left cannot.

  1. Unlikely. One would have to align the edge of the sensor right on or very close to the edge of the F vertical bar so that the sensor does not see the horizontal line.
  2. Irrelevant. No target and set up posted so far match the situation above.
  3. Incorrect. The non-crossed sensor will not lock focus unless the "F" is proportionally a large character which would allow the sensor to latch on the small horizontal bar at the top or bottom of the "F". If not the lens hunts and will not lock focus, which is different than locking and being inaccurate.
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Thierry - posted as regular forum member

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