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DakangWu · 04-03-2025

I just bought a RF600mm f4.0 from B&H. When I move my lens, not hooked with a camera, it feels like something inside is moving. When I shake the lens gently, it feels a ball is rolling inside. Is it normal?I feel worried.ThanksDakang

DakangWu · 04-03-2025

I just bought a RF600mm f4.0 from B&H. I try to register my lens, but cannot find serial number. Can anyone help me to find it? Thanks

DakangWu · 04-14-2025

Yes, thanks! The tag is reflecting. It is hard to see without proper light

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RF600mm f4.0 feels like a ball rolling inside

RF600mm cannot find serial number

Re: RF600mm cannot find serial number