AF Fine Tune.

<p>Anyone out there mess with this much? My buddy has that (lens align tool) which is suppose to help you adjust your focus? I did it by the book and all 3 of my lens were the same as far as not changing? +20 or the other way to _20 no change. With his Sony lenses there was a change.<br>

I might have to take them in to the repair shop and have them checked with the D700. This is the best way to have them checked with the camera body. I have an older 20-35 2.8 Nikon and feel it is not as sharp as my new 24-70 2.8 Sigma? These older lenses should be fine, but they were not made with digital in mind all those years ago. I'm I wrong here?<br>

If I had the money I would just get the 14-24, 24-70 and 80-400 and be done with it.</p>

<p>Thanks for any advice,</p>

<p>Morey</p>

<p>How were you testing? If you swing the AF fine tune from +20 to -20 and can't see a difference, then it has to do with your testing approach, not a defect or problem with either lens or camera.</p>

<p>I've tried this with my 24-70 on a couple of occasions. Usually, it looks best at zero (no change) when focused on something a few feet away.</p>

<p>When I focus on something distant, the results vary, but I've never seen a clear "winner," so I leave the setting off. It's a shame, because I find that the 24-70 doesn't render distant subjects as sharply as close subjects. I was hoping that fine-tuning would rectify this issue, but is doesn't.</p>

<p>Try using the chart and method outlined here: http://focustestchart.com/chart.html</p>

<p>I've used it with good success.</p>

<blockquote>

<p>+20 or the other way to _20 no change.</p>

</blockquote>

<p>Make sure you follow the procedure carefully (as described in the manual). It's easy to do it incorrectly.</p>

<p>Proper testing proceedures are critical. Focal length, f/stop all play a role.<br>

This feature is used for lenses which may have a front or back focusing problem.</p>

<p>I've found it useful if one feels a PRIME is front or back focusing.<br>

Attempting to adjust zooms is pretty much a waste of time unless you bias the adjustment to a FL you use 90% of the time.</p>

<p>I was told by my local repair shop that this method only works for AF-S lenses when I brought them my front focusing 50 1.8D. They also told me that with non-motor-driven lenses, the problem has to be in the camera body and not the lens because the lens just does what the camera tells it. OK, so there's a problem somewhere... Why would my camera only mis-focus with this one of my 7 lenses? Anyone know where I can get an in depth explanation of this entire subject? Thanks. Richard, thanks for the link to the chart!</p>