Focus Question Regarding Sigma Lens On A7riii

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Mecca66 Regular Member • Posts: 180
Focus Question Regarding Sigma Lens On A7riii

I recently bought a Sigma 35mm 1.2 lens which I use on an A7riii. The lens takes great pictures and the focusing is spot on. My question is, when I have the camera in AF-S, when I touch the shutter to achieve focus, there is a light thump or thud or jump within the lens just before it achieves focus. There is no audible noise, just the thump which you can feel. Focusing is not adversely affected as focus is fast and accurate. This does not occur at all in AF-C which is what I normally use. Has anyone else experienced this with this lens, or any other Sigma or Sony lens for that matter? Just wondering if this is within the norm.

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