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I just picked up a new FE 50mm F1.2 GM. Do you have one?


I noticed that when the lens is not mounted on the camera when I turn over (end over end) slowly, I hear and feel a quiet thunk inside. It's like something heavy inside is moving on rails. It's not a rattle.


I think I feel the same thing when the lens is mounted on the camera (A1), but that seems to stop when I turn on the camera.


I have other Sony lenses, but this FE 50mm F1.2 GM is the only one that does this.


Is this normal?


Should take this back to the authorized Sony dealer where I got it?


Thank you.


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