Interesting that you should ask about the 80-400 today. I was out back shooting some birds this morning with my D800
and this lens mounted on a tripod. As I began to adjust the level of the camera, I noticed a slight bit of 'play' between the
camera mount and the lens. I had never noticed this before when hand holding the camera. I switched to my 18-35 and
24-70 and did not experience the same movement. I am wondering if I should be concerned.