I have a Nikon D90 with several thousand dollars worth of various prime and telephoto lens'. The HD video is a gimmick compared to almost any dedicated camcorder. For one thing there is no on the fly auto focus. It focus' one time before starting the filming and that's where the focus remains until you stop. I have not tried to film pool with it I have to admit. There are way better options though. I would not go this route if I were you.
JC
PS: I also have two point and shoot camera's that I have filmed pool with. My most recent one is a Panasonic Lumix DMC FZ-35. It takes really good video outdoors but in the pool room it has trouble with both focus and lighting. Plus no remote so you have to start and stop it by hand.
I would tend to disagree somewhat, maybe it depends on the DSLR. The HD output of the Canon DSRLs (T2i, T3i, etc) is outstanding quality. Yes they fall short on autofocus and stabilizing, which was discussed earlier in the thread. A non-issue for filming pool tables. The choice depends on your own needs: do you have a use for DSLR photography, etc.
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