I have been experiencing problems shooting concerts where the lighting has been really bad. Since it is so dark I set my camera to its lowest aperture setting of f/3.5 and I set my ISO to the highest setting of 1600. I have the most trouble manipulating the shutter speed. In order to get brighter images I try to set my shutter speed to a slower setting but the pictures come out REALLY blurry! Then I try to speed up the shutter speed a little and they come out REALLY dark. I can never find a happy medium. I don't know what to do!