Press the ISO button and then the green button at the same time and your sensitivity will go into auto mode. This trick is probably hidden away somewhere in the manual
The only time you wouldn't achieve a proper exposure in shutter priority would be when your lens isn't fast enough to support the chosen shutter speed at that ISO, and this will be depicted in the VF by a flashing F stop value. Setting the ISO to auto would be the beginner's solution here- more experienced users would probably change either the shutter speed or both the ISO and the shutter speed to find an equillibrium.
Adam
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