Normally, it is the mount on the camera that is adjusted for flange depth. The adapter should be perfect in distance by itself. Also, normally, we feel it would be chasing a tail to have shims in an adapter and the lens mount. However, if you know the camera's mount is perfect yet when the adapter is on it is not and if there are shims in the adapter, then these shim would most likely be usable. Since we have not hear of this before, we are only able to give our opinion.