Sigma 50mm F1.4 EX DG HSM (Something moving inside, is it normal?)

[GeorgeMendes]

Hi,
So I just bought this 50mm lens and now I'm wondering if this is normal...

When I hold the lens in my hand and gently shake the lens, it feels like there some large part inside the lens that is moving around and making a slight clunking sound.

The lens seems to take OK pictures but it is really odd that it behaves like this.
Is this normal?

[nitehawk]

Perhaps you should ask the store you bought the lens from.