You can use Manual, Aperture Priority or Shutter Priority modes. Whichever you find most comfortable. I would not recommend using a Sports mode unless you have used it successfully before in similar lighting. The lighting will be so poor, you should start by shooting at maximum aperture, using Manual or Aperture Priority. You can always stop down once you are certain you can obtain a fast speed. To freeze motion and for the sharpest results, a 1/500 shutter speed is ideal. If you choose to use Shutter Priority, set it for this speed. You can stop action, with some level of motion blur, using slower speeds. When using a camera/lens that cannot be set to yield a decent exposure at 1/500 speeds, you can minimize motion blur by trying to capture players at the top of their jump. Or, by panning with them as they move parallel to the lens face. ISO should be set at ISO800 up to ISO3200, depending on the lighting and the shutter speed desired. The higher the ISO, the faster speeds you will be able to obtain. The amount of image noise increases as ISO increases. For small prints or web viewing, this may not be much of an issue. For larger prints, it can be. There are many fine Noise Reduction solutions available. There are also techniques that can be used during post processing to reduce or minimize image noise. The key thing to remember is that you can always remove noise, but you cant remove motion blur.
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