16-55mm: aperture keeps randomly changing when I set it to f8?

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chapada Regular Member • Posts: 264
16-55mm: aperture keeps randomly changing when I set it to f8?

I've owned my 16-55mm for two years now and I mainly use it when traveling. My aperture is set to f8 most of the time. On my last trip I noticed it started to do a weird thing where it kept randomly switching the aperture when I set it to f8. Like it would go to f5.6, f2.8 and then settle for f.4. Is that a mechanical problem? I have a trip coming up soon and can't get it fixed right now. If I leave it at any other aperture value it stays as it is.

 chapada's gear list:chapada's gear list
Fujifilm X-T3 Fujifilm XF 50-140mm F2.8 Fujifilm 16-55mm F2.8R LM WR
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