Fujifilm X-S10 Changes Focus When Adjusting Aperture

[DakotaM]

Hey all, my employers recently purchased a Fujifilm X-S10 with a Viltrox EF-FX2 Mount Adapter for Canon EF lenses. We've been having a problem where when we change the aperture with the dial, the focus shifts dramatically. It doesn't happen every single time, but it's often enough to be a cause of concern. It happens with nearly every Canon lens that we have and only in video mode.

You can see in the video that the focus changes and the only adjustment that was made was an aperture change from F2.0 to F2.2. The camera is in manual mode and the lens has been set to manual focus.

Has anyone else run into a problem like this? I'm trying to decipher if this is a camera problem or a problem with the Viltrox adapter. We have no reason to believe it's a lens problem because we've used it with many other cameras and haven't had these issues.

Any help would be much appreciated. Thank you!

[andrei89]

such a drastic shift in focus could only be an adapter issue IMO...check if your adapter has the latest firmware otherwise raise the problem to viltrox. you could check with a fuji lens just for confirmation, but i highly suspect it's an adapter issue