Just noticed this today. I have already tryed few different pieces of macro. Nothing changed it. Seems to be coming from the on/off part.
Its real tinny hiss one you don't move cant hear with camera. Other wise if it moves pretty loud as you can see in video.
If i need to take it apart can someone show me how never tore apart an asa before. Like if i need to change an o-ring or something. Thanks.