I have only taken a few shots of my son playing rugby in very low light and freezing cold. I could at least move up and down the pitch to follow the action which helped and it gave me a good low viewpoint. I used a 70-300 zoom which was a fine choice, used centre focusing point, servo focus and a high an ISO as needed to keep the shutter speed up which on a Canon 20D was 1600 ISO. Must have another go sometime, I am sure there will be others on the forum with more experience of this type of photography who will be able to help you more.
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