Can you hear the hum? There is some background noise of birds and flies... but not that. Can you also hear the zoom? I got this camera to fit into an RC plane and take HD video... thankfully.
The mic is rubbish and the position of it on top while typical of these cameras, it's at the back above the controls. The audio noise while recording appears to be caused by the selection to record..and it's slighting twittering and not the same as heard in the video - strange. The zoom is very noticeable on the video. Video zoom with this camera is only 3X... not exactly a huge event.
I agree the extra noise does seem excessive, obviousley a design fault! However when its up in the clouds diving and soaring, (bombing maybe the cameras manufacturer!) etc it may not matter. Put up a long distance shot for us to have a look at if you get time, thanks Kev