DanLewis,
If you don't have trackir the best way to center the sights is pressing F1, just like Alpha said. However, if you are a Trackir user, the best way to center it is by moving your head to the bottom left corner just a bit and CENTER THE TRACKIR DEVICE VIEW, then when you move your head back to the normal position the sight will be centered.... it's a trial-error practice until you get it where you want it... this way you'll be able to keep using your 6 DOF with trackir, an option that dissapears when using the F1 function, that will only allow you to turn your head, and not "drag" the view to the sides, front, back, etc.
Good luck
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