Welcome toour forum, Felix.


I use a BushHawk320D mount with my 100-400 and it works very well for me. It can be used with any handholdable telephoto lens with a tripod collarand it can be adjusted tothephysique of any photographer. The only complaint is that the shoulder pad comes off and can be lost easily.They provide parts if you lose or break something.


Also, because you hold your camera/lens (=heavy)by themount (=relatively light) attached to the bottom of the lens (tripod ring), the whole thing may initially feel a little unsteady becausethe center of gravity is somewhat high.It does not take long to get used to it.


If yougive it a trymake sure you chooseshutter release cable specific to your camera.


Good luck