This is a Nikon AF-S FX TC-14E III 1.4x Teleconverter Lens can anyone tell me if this moves "back and forth" when you shakethe this teleconverter.
There is a linkage which communicates the aperture setting from the camera to the lens. When the converter is not installed, this part is free to move over its range if you shake it. Once installed between the camera and lens, there should be no rattle.