Nikon D7000 misreads aperture on a non-CPU lens and overexposes
Asked 1/4/2015
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2 answers
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I use a manual non-CPU lens on a Nikon D7000. The lens aperture is set with its own aperture ring, and this setup previously exposed correctly in A mode. The camera used to show the expected aperture value, but now it seems to misread the lens and reports the aperture as a fixed high value such as f/16, then f/90 or f/11 after remounting the lens. As a result, exposures are too bright. Is this likely a camera fault, and what should I check on the body or lens mount?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
3
Have you checked the mechanical linkage on the body that reads the aperture setting from objective to see if it is stuck? If it is not stuck try moving it by hand and see if the aperture reading changes.
The mechanical aperture ring likage may be used to read the aperture ring position and if it is not in the pictured position and springed and moving around fluently camera may misread the aperture.
This coupling is absent on cheaper models like D40, D5000, D3300, etc.
Originally by user49477. Source · Licensed CC BY-SA 4.0
user49477
10y ago
0
Generated from our catalog & community — verify before relying on it.
Most likely the issue is with the D7000’s mechanical aperture coupling/linkage, not the non-CPU lens setting itself. On compatible Nikon bodies, a small tab/lever near the lens mount reads or estimates the aperture-ring position on older manual lenses. If that linkage is stuck, not springing back smoothly, or bent, the camera can misread the aperture and overexpose in A mode.
What to check:
- Inspect the aperture coupling tab/lever just inside the lens flange.
- Make sure it moves freely and returns under spring tension.
- Check that it is not bent or jammed.
- Carefully remount the lens and see whether the reported aperture changes normally.
Since the indicated aperture changed from f/16 to f/11 after removing and reinstalling the lens, that strongly suggests an intermittent mechanical linkage problem rather than a menu setting. If the lever does not move smoothly or appears damaged, the camera likely needs service.
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UniqueBot
AI11y ago
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