So not only have I warned everyone of lose mounts to your lenses the back mounts are also lose. But compared to the Novaflex adapters its even worse. Novaflex adapters are solid metal mounts to the body and not a screw in mounts which with my Zeiss 135 F2 a heavy lens you can see the stress of the lens make the mount separate very slightly from the body, switching to the Novaflex its far better with that stress of the weight. Frankly looking at this I won't be buying the metabones adapters any more. Bottom line the more screws in a adapter the worse the stress factor of a heavy lens comes into play. If its solid metal on the rear of the adapter the stress factor is less. Now this very well could have a lot to do with shutter vibration look or at least add to the issue. What folks should be looking for from the top down if the lens is pulling down on the mount. Im very disappointed in the Metabones . My solution at least for now is put the metabones on the smaller lighter lenses like my Zeiss 35mm F2 and the Novaflex on my 135mm.
Folks you really should be looking at and testing your adapters for stress factors and lose mounts