Focus jittering during videos - is that my lens or settings?

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SillyPosition Regular Member • Posts: 213
Focus jittering during videos - is that my lens or settings?

I have this phenomena which I encounter in many videos I shoot with my a7c + 35GM, where the image is shaking sometimes.

I have this example in a short youtube video I uploaded, especially in the second part, what is causing it?

Any suggestions if I should do something to my focus settings in order for videos to be smoother?

 SillyPosition's gear list:SillyPosition's gear list
Sony a7C Sony FE 35mm F1.4 GM Sigma 28-70mm F2.8 DG DN
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