SUNWAYFOTO brand Low Profile Head with Arca / RRS Compatible DDH-06 Panning Clamp. Precision Panning Base with integral clamp and bubble level for smooth and level panning. It's your ideal ball head for shooting panoramas. The scale with laser-engraved centering index marks can precisely master any angle variation during each shoot in horizontal rotation，the aligned scale of quick-release plate can accurately control the nodal point during the panoramic photography in different focal lengths. So the panoramic photography could be more accurate and high efficient. When taking panoramic shooting, you need to make sure all the pictures are level. However, you can't always put your tripod on the level ground. When using our panning clamp, you don't need to level the tripod legs. Just level the panning clamp, you can take panoramic shooting easily. Locking System is located on the side of the ball instead of the bottom of the ballhead. Whole center of gravity is lowered more than 15%; Adopts geared locking structure, higher locking strength; Specially designed panning base, smooth operation; Elliptical ball for progressive resistance and avoiding suddenly sliding down; Two drop notch design. One for portrait, one for tilting; All metal knobs for reliability and long term durability; Two set spirit level mounting holes for users to mount the removable spirit level to the other sides of the clamp; Special structure makes it the lightest of its class. 360° panning movement with calibrated precision, precisely capture overlapping panoramic images. Load Capacity 88 lb (40 kg) Ball Sphere Diameter 1.7" (44 mm) Quick Release Yes, Arca-type compatible Spirit Level Yes Tension Control Yes Separate Panning Lock Yes Tripod Mount Thread Size 3/8"-16 with 1/4"-20 bushing adapter Height 3.2" (82 mm) Maximum Diameter 2.3" (58 mm) Weight 1.1 lb (478 g)