Question! 5DmkIV aperture problem

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mz6666
mz6666 New Member • Posts: 3
Question! 5DmkIV aperture problem

So I recently bought a new used lens by Sigma that has the aperture of F1.4. All my lens I've owned are around F2 so was nice and exciting. But after attaching the lens to the body I found out that It only shows up to F2 on my 5D body. I've tried resetting and updating both the lens and body and it is still the same. The camera is fairly new but I bought in Japan. I am currently trying to reach out to Canon Japan to see how I would be able to repair the camera.
I've also tried putting the same lens on different bodies including another 5D4 owned by my friend. The contact points are clean considering how I've only owned the camera for 5months max.
Does anyone have experienced similar problems? and know what might fix it?

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