Its a recent occurrence, but after my camera takes a shot, it sounds like the shutter on a film camera. Its weird. Is it the camera adjusting itself? It makes the same sound when I click the settings button.
Is this between having taken the shot and before the camera goes back to the viewfinder? If so, it's just the sound of the shutter in the camera opening and closing, which would explain why that same sound comes on when you dive into settings as the camera is disabled whenever it isn't needed. This happens on my 1020.
