The BH-55 offers up to 45 degrees of tilt in all directions, and up to 90-degrees in the two drop-notches. The knurled main lock knob independently controls the tension of the main ball joint. The midsize knurled knob features independent control of the panning base, which features laser engraved degree markers every 2.5 degrees.
Looking at the specifications, you might not realize the fact that the BH-55 is no small ballhead – it is the biggest one Really Right Stuff makes. With a base diameter of 74mm, this sucker is noticeably wider than most standard ballheads out there, including the Arca-Swiss Z1. And at 1042 grams (with PC-PRO clamp), it is also one of the heaviest.