I'm almost embarrassed to be asking this question. . . I have never had this issue before and I cannot figure out what I must have done. I took 1000 pictures at a ballet show today and every single photo was blurry. I took the same 1000 pictures yesterday at the previous show and every picture was sharp and in focus. Settings were the same; pretty low light so 1/250, F2.8, ISO 3200. Lens 70-200mm. Like I said, everything yesterday was the same. I'm thinking I accidentally pushed a button on my camera without knowing it because it was very dark in the audience, but I don't know what I did. Does anyone have any ideas? I've been taking live action dance pictures for 8 years and I have never done this before.