AF fine tuning...should I be concerned?

Started Nov 29, 2007 | Discussions thread
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gnagel Veteran Member • Posts: 7,792
AF fine tuning...should I be concerned?

I used the AF fine tuning feature on my D300 to tune each of my seven lenses. To do this, I calibrated each lens at its greatest focal length and widest aperture. Here's the results (from the most to the least amount of adjustment):

Nikkor 70-200 f/2.8 with 1.7x TC (0)
Nikkor 70-200 f/2.8 (+2)
Nikkor 105 VR (+3)
Tokina 12-24 f/4 (+4)
Nikkor 17-55 f/2.8 (+12)
Nikkor 85 f/1.4 (+14)
Nikkor 50 f/1.8 (+20...and it could have used more)

A couple of things concern me. First, even though I had the camera securely mounted to a tripod, it seemed that I ended up with different results each time I test a lens!

Next, nearly all of the adjustments are going in the same direction. Is this a sign that the camera is off?

Also, I became alarmed when some of my sharpest lenses (e.g., Nikkor 85mm) showed such large adjustments!

Finally, I'm wondering if these adjustments will end up getting diminished as I move to narrower apertures and further distances. It seems that testing lenses wide open at close distances at maximum focal lengths would exaggerate the extent of the adjustment. Is this true?

Thanks in advance...

PS- I just noticed that this was my 2,000th post on these forums!

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