Hi all! I just recently upgraded to the D7100 and went to shoot with it in manual mode tonight. I ran into a problem where I could only get the shutter speed up to 1/250 when it's supposed to go up to 1/8000. Anyone have any idea what's wrong? I read the entire manual and tried so many things. I don't understand why it won't let me increase the shutter speed. Not using flash or anything. Please help!