Sat 10-Nov-12 01:22 PM | edited Sat 10-Nov-12 01:40 PM by jacsr
The 18-300, 18-200, 70-300 and 24-70 are nose heavy when placed on a ball head. The camera is the attachment point to the ball head, the weight of the lens is in the front especially when zoomed. After setting the sweet spot, you will notice that when you move more than 20 degrees or so off horizontal especially downward you notice the lens beginning to creep within the sweet spot. On a small ball head like the Q3 you will have to progressively tighten the tension to eliminate creep possibly to the point of nearly locking down the head. Several here have used the Q3 with a 70-200 or 300/4 (bigger, heavier) without issue; however, those lenses have a foot that allows them to be better balanced on the head, thus they perform better within the Q3 sweet spot.
The larger the ball head the better equipped it will be to handle nose heavy lenses. So the Q10 will work better than the Q3 and the Q20 better than the Q10. Since you have a series 2 tripod the Q10 would be a good match, however, the Q20 is only about $50 more than the Q10, you could future proof your purchase by going that route and never have to worry about the ball head again.