Quote Originally Posted by Loupey
Grandpaw - I have the 322RC2 and stopped using it about 2 years ago. Even though it is rated for 11 pounds, it slips too much for my purposes (even with the tensioner turned all the way up). I can't use my 300mm lens at real-world angles without it drifting.

I recently started using the 488RC0 ball head and it is much better (and cheaper too). The quick release plate is heavy duty and the whole rig will easily support my 500mm. The larger ball allows motion to be much more fluid.

The 488RC0 will allow you to grow with it longer.

Spec's for the 488RC0 is HERE.
I am curious, when you say the tennsioner is turned all the way up, are you speaking of the wheel in the handle or the large recessed hex screw in the back of the handle that actually tightens the tension on the ball? If you tighten that one down all the way the ball will not move. The wheel is for fine tension adjustment. Just a thought.