When it comes to ball heads, bigger is better. The larger the area of the ball, the greater the opportunity to adjust friction and grip. And that leads to more holding power, more weight, better balance and so on. Regardless of the traditional "maximum weight capacity" rating, it really comes down to (1) the size of the ball and (2) the locking mechanism for that ball. There are two things I look for in a ball head. And with a 55mm ball on this head, we're in the good sizing range - comparableβ¦