24-70mm f4 Sony lens knocking

Started 7 months ago | Discussions thread
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jassyou Junior Member • Posts: 29
24-70mm f4 Sony lens knocking

I have just bought this lens last week. after a few times using it, I noticed whenever I turned the camera (lens attached to A9), there was a knocking sound which I suspect coming from the lens.

Anybody has experienced like this? What is the probable cause? BTW, the lens is under warranty.

Thank you.

 jassyou's gear list:jassyou's gear list
Canon PowerShot S120 Panasonic Lumix DC-ZS80 Sony RX100 VII Fujifilm FinePix S5 Pro Nikon D60 +33 more
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