I just opened a brand new Nocticron 42.5mm lens and it seems to have a loose part inside. This cannot be normal but I am asking Nocticron owners what they think. with both lens caps off, I can hold the lens and gently shake it and something moves back and forth. Whatever is moving is not too light. It feels like something heavier moving back and forth. It makes a slight noise when it hits it stop on both ends. I have not even used the lens yet and will be calling Panasonic right away. Just wanted to check with real users too. Nothing shakes or moves if I gently rock the lens forward and back along its axis. If I do the same side to side, I here the noise and feel the loose part sensation. Thanks for any help and or observations. The lens does function and focus.