RF600mm f4.0 feels like a ball rolling inside

[DakangWu]

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.

Thanks

Dakang

[shadowsports]

Greetings,

Its the IS.  Nothing to worry about.  When the lens isn't attached to a camera and powered on, the image stabilizer can rattle a bit.  Its completely normal.   

[ebiggs1]

"When I shake the lens ..."

I would not do that! 🤔

Let me ask, you have the Canon RF 600mm f/4 L IS USM Lens? A $14,000 dollar lens? You don't have the very much cheaper Canon RF 600mm f/11 IS STM Lens. If I owned the first lens it would go to Canon not tomorrow or next week but today if it made any noise inside.