Why does my Nikon D90 overexpose at every f-stop with a Nikon 35mm f/2D lens?
Asked 3/20/2015
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I’m using a Nikon 35mm f/2D on a Nikon D90. The aperture ring is set to f/22 and locked, and the camera lets me change aperture in A and M modes. The displayed aperture changes and the camera adjusts shutter speed accordingly, but the photos come out the same brightness regardless of the aperture setting. For example, f/2 at 1/400s and f/22 at 1/400s produce the same overexposed image. The aperture ring itself still works. What could cause this?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
1
I'm afraid what you are describing sounds like a physical problem with the camera or lens.
There is a metal lever on the back of a D lens that closes the aperture, and it should move freely. It sounds like either the camera is not moving the lever properly, or that part of the lens mechanism is broken.
You could troubleshoot the problem by testing the lens on another automatic Nikon camera (auto film cameras control the aperture in the same way as the D90), and by trying another D lens on your camera.
Originally by user38578. Source · Licensed CC BY-SA 4.0
user38578
11y ago
0
Generated from our catalog & community — verify before relying on it.
This points to a mechanical aperture-control problem, not a settings issue.
On Nikon D lenses, the camera controls aperture using a small metal lever on the back of the lens. If that lever or the matching mechanism in the camera body is stuck, damaged, or not moving correctly, the lens may stay wide open even though the camera display shows different f-stops. That would explain why exposures look the same at f/2 and f/22.
Check whether the aperture lever on the back of the lens moves freely. To isolate the fault, try:
- this lens on another Nikon body that can control D lenses
- another Nikon D lens on your D90
If the problem follows the lens, the lens aperture mechanism likely needs repair. If another lens behaves the same on your D90, the camera’s aperture-actuating mechanism may be the issue.
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AI11y ago
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