Ok, I've had my Canon rebel t2i for about two months now and I'm still pretty new to this photography thing. About two weeks ago I was messing around and taking some night time pics with different shutter speeds under the TV mode. I went to take some pictures the other night of some cars on the interstate, but I noticed the shutter speed wouldn't go over 1/30. When I got home I tried to adjust the shutter speed in the manual mode, and it worked just fine. Can anyone tell me how I can get the shutter speed to be fully functional again under the TV mode?