D800 + 85 1.4G Controlled AF Test Results: Left AF point definitely bad.

Started Apr 13, 2012 | Discussions thread
TOF guy
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Re: Final update: D800 back from Melville Service Center
In reply to CFynn, Apr 29, 2012

CFynn wrote:

If both left and right are in focus and the center is out are you sure it's not just due to a lens with a curved field of focus?

That does not come into play. If you focus with the left sensor, the sensor should work and the image be properly focused where the sensor is aiming at, regardless of curvature of field. Where curvature comes into play in that as follow: once the focus is achieved by the AF sensor, the plane of focus in the center part of the image will be slightly be behind (always) the focus plane chosen by the sensor on the left part of the image. That' in the same image . If now you focus with the center sensor, the plane of focus will move back a little and the left part of the image will be "front focused", with correct focus in the center.

Here we're comparing 2 images , one taken with the center sensor and one with the left (or right) sensor. They should all be in focus at the intended target regardless of field of curvature.

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Thierry

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