Just wondering if any other owners of the Nikon 28-70 2.8 zoom have any issues with the lens sounding or feeling loose. Let me explain. I am new to this lens and purchased on that was regularly serviced every 2 years with no issues during its lifespan. However I notice a few things: 1. The focal length ring when you turn it gives off a light grinding noise as it slides between 28 and 70. It's smooth but a little noisy. 2. The focal ring I believe is a tad loose. When I hold the lens and turn it upside down and right side up the insides sound a little loose. Like a few knocks and pings. There is also maybe 1/2 mm of play in the ring. Any other owners experience this? I mean, if I take my brand new 50mm 1.4 AFS prime and lightly rotate it or shake it I feel movement inside as well, so I am not sure what to make of it. I have a Nikon lens/camera friend whose been repairing cameras and lenses for 40 years so I do plan to let him tune it up, but before I do I was hoping to hear from some fellow owners. Much thanks!