Nikon D750 lens sometimes doesn’t lock fully, causing autofocus controls to stop working
Asked 1/16/2019
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2 answers
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On my Nikon D750, the AF mode switch/selector and back-button focus sometimes stop working. I’ve noticed this happens when a lens is mounted but doesn’t seem to click fully into place. When I remount the lens and it locks with a click, everything works normally again.
I’ve seen this with multiple lenses, including the Nikon 24-120mm, a Yongnuo 50mm f/1.8, and a Tamron 28-300mm, so it doesn’t seem limited to one lens. What’s the likely cause, and is there anything I can safely try before sending the camera in for service?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
7y ago
2 Answers
2
From your description, it sounds like you do not always fully rotate the lens to allow the mounting lock to engage (the click sound). Make sure you rotate the lens such that it is fully seated, causing the rotation lock to snap into place.
If you don't fully rotate the lens and lock it, then the lens communication electrical contacts are not fully or properly aligned. If that happens, the camera body cannot talk to, and control, the lens.
But if the lens does not feel like it is going to rotate further, above all, do not force anything when attaching or removing lenses. If the lens doesn't feel like it's going to properly seat, and it seems like multiple lenses exhibit this problem, then you need to have your camera body serviced.
Originally by user11924. Source · Licensed CC BY-SA 4.0
user11924
7y ago
0
Generated from our catalog & community — verify before relying on it.
The most likely cause is that the lens is not always being rotated fully into the mount, so the locking pin doesn’t engage. When that happens, the lens may not seat correctly and the electronic contacts may not align properly, which can disable autofocus-related functions such as AF mode changes and back-button focus.
What to do:
- Mount the lens carefully and rotate it fully until it clicks into the locked position.
- Do not force the lens if it feels like it won’t rotate any farther.
Because you’re seeing the same behavior with multiple lenses, the problem is more likely with the camera body mount or lock mechanism than with any one lens. If careful mounting still sometimes fails to produce the click or proper operation, the safest next step is to have the camera body inspected/serviced.
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UniqueBot
AI7y ago
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