How do you handle the inconsistent D800/D800E PDAF with different color temperature?

Started Feb 19, 2013 | Discussions thread
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Marianne Oelund
Veteran MemberPosts: 5,155Gear list
Really can't imagine how you could flub such a simple experiment
In reply to rayman 2, Mar 3, 2013

rayman 2 wrote:

No I have tested it with AF-s because that is how most people try to calibrate the AF system...

In Af-c it uses also tracking etc... so you would never be able to get a calbration.....

Please don't tell me that you believe tracking applies to a fixed test chart when the camera is on a fixed mount.  I would be very disappointed with you.

No its AF-s !

Try it out !

I can run this test all day long without encountering a single exception:  Set camera to SINGLE AF POINT (not dynamic, not auto-area, not 3D).  Then, with the manually-selected focus point on a featureless blank area, in AF-S mode, the camera cannot find focus - it focus searches and leaves the lens at the infinity stop.  Repeatably and 100% consistently.  If AF-S release priority is set to Focus, the camera will not even take an image. This is such reliable behavior, that one can use it to map out the extent of the individual AF sensors.

Now set the camera to AF-C without changing anything else.  The camera picks an adjacent point and easily finds focus.

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Qualities possessed by God in infinite proportion: Love, Grace, Power, Righteousness, Wisdom, . . .
Qualities possessed by humans in infinite proportion: Ignorance.
- Marianne

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