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Is it possible that it's always made that noise and you've just not noticed?
I ask because my Olympus used to make a noise that sounded like a sort of high pitched rumble on long exposures. It's the electric mechanism holding the shutter open. I imagine it's the same thing on the Sony.
As an aside, the SSWF on the Oly E-510 also makes a lovely vibration when you turn the camera off that really worries people when they don't know what it is. You can actually feel it shake the camera body!
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