Scott Sewell Offline Dedicated FM Upload & Sell: On
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James, just looking through this thread after getting your PM a while ago. I would not suggest you ditch the Sigma lens until you know for certain the lens is causing problems. I don't see anything in this thread that tells me you are having gear issues.
Not trying to be harsh--just want to get to the point--you seem to really be fishing around trying to get a handle on the basics of shooting indoor sports--ISO, shutter speed, white balance, etc. It is important that you have those kinds of issues in check before you can begin to start blaming the gear. At this point, for all we know you could have a faulty camera body! It's easy to blame gear, but without a firm grasp of the basics of exposure and shooting in these (tough) conditions, you're really only kidding yourself and not growing as a photographer.
I don't shoot Nikon, so I'm not sure how much help I can be with gear details. But, as others have said, I would start with a shutter speed of 1/500, wide open (f2.8 on the 70-200) and then set the ISO to whatever you need to get you proper exposure. At this point, I would even shoot with auto WB until you get a handle on the exposure basics for shooting action. You can always dial in WB once you know you're getting good exposure. I shoot center point focus only and use a custom function in the body to separate focus and firing the shutter (helps track action without losing focus).
Good luck.
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