Originally posted by reivax Kr doesn't have TAV mode. It was the main reason I switched to a K-30. I do agree with letting the ISO float. I usually do this but stop it at 6400, I wonder if I should let it float even higher. How high do you let it float?
It depends on how good you are with noise removal software.
Tv mode is a good place to start. In practice, I would set auto ISO and allow it to go wherever it wanted at first. Then you want to find the slowest shutter speed that can capture motion without blur. This will vary a bit depending on the action and where you are. Tv mode will probably force the lens to be close to wide open, which you want, f4 to f5.6. If the aperture goes higher, it probably means the ISO has gone up too. You can use your practice shots to set an upper ISO limit so the camera doesn't decide to run it way up when you're not looking.
Now you can take regular shots. If the performer is moving fast, turn the e-dial to the higher shutter speeds you chose earlier. If they aren't moving that fast, you can use a slower speed. The lower speed limit will depend on how still you can hold the camera. At maximum zoom, you'll have to use a faster speed than at 50mm. You can help this with a monopod or convenient railing.
Look at your histogram and make sure it's not way over to the left side. That means underexposure. Later on your computer, you might want the shots brighter, which will just all lots of noise. Exposure is more critical at higher ISOs.