Well, I pulled another bonehead move. I was in a hurry to grab some shots and didn't realize that I had removed my RRS tripod collar on the 70-200 to use on my 300 f4. I then mounted the 70-200 on my D4 and mounted that to my tripod using an RRS L bracket. I took my shots and left the camera on the tripod overnight. So the camera (with flash attached) sits on the tripod with the 70-200 hanging out there with no support. I know this D4 is built like a tank and the camera with the flash on it actually weighs more than the lens, but with the length of that lens I'm concerned that I may have twisted the mount to some tiny degree. Clearly the lens comes with a tripod collar for a reason. Thoughts?