Originally posted by clickclick You mean the lens rotating relative to the mounting flange, not the mounting flange moving relative to the body, correct? Assuming it's lens rotation, you're just seeing the variances in the size of the locking hole/slot on the lenses versus the locking pin on the camera body. Something like this is never going to be 100% tight and doesn't have an practical affect on performance.
Yes, lens rotating relative to the mounting flange and not the flange to the body. I assumed it was due to manufacturing tolerance stacking, and by the responses received, appears to be the case.
Originally posted by DeadJohn I've noticed similar with my Sigma 50-500. Large lenses require a firm grip with the left hand, so as your right hand moves slightly our of sync the connection twists. It's normal. It's much less noticeable with small lenses because you aren't applying as much strength to hold the camera and lens.
Agreed; the larger and heavier the lens, any rotational play in the mount/lens combination gets exacerbated.
I initially posted this question because my previous FF body (Canon 5D) did not have any noticeable movement between lens and mount - even with a relatively heavy 100-400L lens.