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DeanAZ

Phoenix, US
4176 posts

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DeanAZ Gold Member Expert nature photographer Nikonian since 28th Apr 2007
Sun 03-Apr-11 10:23 PM | edited Sun 03-Apr-11 10:25 PM by DeanAZ

I wanted to play, too.

Setup:
D7000 on a tripod, mirror lockup with remote, VR off.
Camera set to single point AF.
Test target parallel to camera at about 22" from sensor plane.
I tested 3 lenses at various focal lengths;
AF-S VR 18-105 @ 18mm, 35mm, & 98mm
AF-S 18-55 @ 35mm & 55mm
AF-S 35mm 1.8

Procedure:
I took a test shot at each of the following AF fine tune values;
+20, +15, +10, +5, 0, -5, -10, -15, -20 in that order.
I would move the focus ring to infinity prior to letting the camera autofocus then use the remote to trigger the mirror up and wait about 5 seconds and pressed the remote a second time to take the shot. Then I would make the adjustment to the next AF value.

The displayed shots are 100% crops from the center of the frame where the focus point was active.

Results:


Click on image to view larger version



Click on image to view larger version



Click on image to view larger version



Click on image to view larger version



Click on image to view larger version


Click on image to view larger version


Conclusion:
At this distance all three lenses tested benefited from similar amounts of AF fine tune. Additional tests could be done at the same distance to determine where the best AF tuning occurs as it seems the value falls somewhere in between the multiples of 5 that I tested. I have no idea if these values will provide improved results at other distances but I will try to set up another test to see the effect of distance on the best AF value.

I'm not quite ready to turn on this feature yet until I get confirmation at several distances. But if I were a macro shooter at a known distance I would want to understand how to get the absolute sharpest image and this would mean exploring the possibility of using AF fine tune.

If I get a consistent AF tuning value on every lens at various distances I would probably send my camera in for calibration under warranty.

What do you think?




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Dean
Phoenix, Arizona USA

Time-Lapse: Vimeo-Dean Andersen

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Reply message Repeated Fine Tune Tests
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