My D800 after Nikon service shows great AFA diviation

Started May 20, 2013 | Questions thread
AZBlue Senior Member • Posts: 1,801
Re: My D800 after Nikon service shows great AFA diviation

Gil1980 wrote:

Hi all,

I shipped my D800 to calibrate and fix it's left focus issue which was confirmed to have that know bug.

I sent the camera together with my 14-24mm and the 80-200mm f/2.8

The 14-24 was sent because I tested the camera with this lens. The 80-200 was send for a regular calibration after being at my disposal since 1996.

Yesterday I used LensAlign MKII with FocusTune to calibrate my lenses and I was amazed to see that the above lenses shows perfect AFA value of 0. There is a slight shift to +1 when shifting from 14-24 and about the same with the 80-200.

However, I have a couple of lenses that I didn't think need service since they had sharp results with the D800.

Now, after the service, the nikon 50mm f/1.8 needs over +20 AFA and the nikon 24-70mm f/2.8 needs +15 @ 70mm.

I don't want to rush into conclusions but it seems that the camera was "fixed" by biasing the AFA values internally with the lenses I've sent them.

What do you guys think?

Um, sorry to pick on you but...

When you send lenses and camera body to Nikon for calibration, they will calibrate the camera to the lenses you sent them. Of course this calibration would not apply to any other lenses. Are you expecting Nikon to do some magic calibration that would give you the same AFA for all lenses? That's just impossible because each lens is different - even samples of the same lens can vary quite a bit.

What, exactly, were you hoping to accomplish by sending your lenses in with the body? And what kind of calibration did you want with the 80-200? Did you want the camera calibrated to the lens, or did you just want the lens re-calibrated on its own to some standard?

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