Originally posted by jaitas Yeah.. I definetly hear the same buzz... I have wondered before what that is and your guess as a mirror lock-up electromagnet seems quite reasonable
And yes it's not the shake reduction noise, because this is hearable even when SR is turned off.
-J
Shake reduction is always active, even when it's turned "off", it's just not working to cancel camera motion. When SR is disabled, the system still has to operate, so that the sensor can be held in the centered position. If SR was actually disabled entirely, the sensor would move around freely as the camera was tilted or shaken.
Most likely what you're hearing is the SR system.