Micrometric ball is not a trivial purchase: you really need to use it ... It is precise, easy to use, gentle in his movements, very convenient for distant aims of architectural details why I use it mainly. It allows a precise adjustment of the focus and perfect stability, even with a relatively long focal length (300mm, 450 is equivalent to APS-C). Beautiful professional finish, perfectly in harmony with my equally excellent Giotto's foot. One problem: the weight of the foot-ball, which becomes important. But with a good carry bag or better yet, free parking nearby, no problem. Quality product, perfectly adapted to its use.
