Maybe the answer is so obvious but I am puzzled about the presence of a physical shutter in the NEX cameras. Logic tells me that the shutter would be obviously in the front of the sensor but when you remove the lens I can see the sensor right in there. Does it use an electronic, virtual shutter that regulates the exposure on the sensor instead of a physical shutter like, let's say in any other DLSR or RF system? Can someone enlighten me? Thanks!