When I mounted the 70-200VR the first few times on the D300, I noticed there was just an ever so slight amount of "play" between lens and camera. I've only had this lens about a week and a half and it wasn't so much that I put much credence to it until I was also using it on my D80. That got me to thinking........there really shouldn't be any "play" when mounted on any camera. I compared with other lenses, Sigma included, and none of my other lenses do this. So, what is everyone's experience with this? Again, it's a very slight amount of movement. I have a few days to return this to BH if I need to but they of course don't have any more in stock at the moment. What is the proper tolerance on this lens when mounted to the D300, etc? Should I be concerned or is this a common thing and I'm possibly over-reacting?