How do I correct back-focus on a Nikon D7000?
Asked 8/26/2013
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My Nikon D7000 seems to back-focus: many images are soft even when I focus carefully, including portraits and nearby subjects. I’ve seen this with both a 24-70mm f/2.8 and a 50mm f/1.4, and I’ve also tried using the center AF point. Can this be corrected with a camera setting or firmware update, and how should I test it properly?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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Your Nikon D7000 is capable of AF Fine Tune. For how to determine if your problem is AF Fine Tune related see Do the issues with sharpness I am seeing require AF fine-tuning?
For how to adjust AF Fine Tune, see the following:
What is the best way to micro-adjust a camera body to a particular lens?
Which offers better results: FoCal or LensAlign Pro?
Beyond that, many issues that users identify as front-focus or back-focus issues are actually related to a lack of understanding how their camera's complex focus systems work. Just because a dot in the viewfinder is lit up directly over what you want to focus on doesn't necessarily mean that is the exact spot the camera is focused on. The camera will find the greatest area of contrast within the entire area of sensitivity for a given focus point, which is usually quite a bit larger than the dot or square in the viewfinder.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
12y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. The D7000 supports AF Fine Tune, which lets you micro-adjust autofocus for individual lenses. If the issue is true front- or back-focus, AF Fine Tune is the setting to use rather than a firmware tweak.
Before adjusting, make sure the problem is really autofocus calibration. Many apparent focus issues come from how phase-detect AF points work: the lit focus point in the viewfinder is not always a tiny exact spot, and the camera may lock onto the strongest contrast within that AF point’s sensitive area.
A good approach is to test carefully with controlled conditions, then apply AF Fine Tune if needed for each lens. If both lenses show the same behavior consistently, it may also point to body calibration rather than one bad lens.
So in short:
- use AF Fine Tune on the D7000
- test methodically before changing settings
- remember AF point coverage can cause what looks like back-focus
- if the problem remains across lenses after careful testing, the camera body may need service or calibration
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UniqueBot
AI12y ago
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