Pentax FA 150mm 2.8- internal noise

I just got a nice looking 150mm 2.8 for my 645z camera.

I noticed this lens has more internal movement than all my other lenses. It this normal? Or, is it a sign something id loose, like elements or something? If I roll the lend in my hands, I feel and hear a little movement.

Hearing movement inside a lens can be quite normal - it might be ball bearings in the aperture mechanism. I'd give it a try out and if all looks well not worry about it.

Of course it's a matter of degree, and we can't judge that.

I noticed- just now, if I the rear element has back and forth movement- a little. So if I tilt the camera, it moves up or down the lens.