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Nikon repair center messed up my D800

Ferguson

Cape Coral, US
5751 posts

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"RE: Nikon repair center messed up my D800"

Ferguson Silver Member Fellow Ribbon awarded for the generous sharing of his high level expertise in the spirit of Nikonians Nikonian since 19th Aug 2004
Thu 17-Jan-13 01:40 AM

>For you camera, I have some questions:
>- Do you have lenses that you trust to be correctly
>calibrated, and are they fine for the central sensor at 0 ?

I have a fair amount of glass, and while some come in at zero they are a minority. These are from old notes (I have done some more tuning), but I think I have:

14-24/2.8, AF=+10
24-70/2.8, AF=9
70-200/2.8, AF=2
85/1.4G, AF=+13
200/F2, AF=+11
200-400/F4 VRI, AF=0
200-400/F4 w 1.4x, AF=0

I'm definitely not one that believes that non-zero means bad, provided I have headroom to hit the right value.

>- How big is the difference in between the central and the
>outer sensor? I mean, what is the difference in between the
>optimal AF Fine Tune for the sensors?

The only one I checked the left/right points was the 85/1.4G. The number above was an average. The actual numbers were:

Left = + 2
Center = + 18
Right = +5

On paper that sounds horrible, but the shape of the curve for the left and right were pretty flat, so picking an average of +13 yielded an acceptable compromise. And in fact I couldn't really tell a difference in left and right by eye.

I believe left/right/center should be nearly identical and they are not. But it was "good enough" that on all my other lenses I could not tell the difference by eye in real images. Only on the 85/1.4 is it an issue, and only very slightly. I have not tried comparing inside and outside (but I use the tuned lenses both places without any apparent difference).

If you are expecting to be able to measure exactly the same value for left/right/center, my GUESS is you will never get there. I think the tolerance is beyond Nikon. But I think they CAN get it close enough that real images are OK. It doesn't sound like they did for you.

Linwood

Comments welcomed on pictures: Http://captivephotons.com

This is a hot, active topic! Nikon repair center messed up my D800 [View all] , sylvatica , Wed 16-Jan-13 11:25 PM
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