The Sirui C-10 Ball Head is an extremely sturdy head with separate control knobs for pan, tilt and tension, plus an Arca-style clamp for the included quick-release plate. The head tilts 90deg. for portrait orientation and the quick-release plate features two pop-up pins that prevent camera twist when it's tilted 90deg. There's also a video pin on the plate to keep camcorders from twisting. The ball locking of the C-10 head is extremely strong thanks to the double-bevel locking system, which helps yield a high load capacity of 33 lb. The quick-release clamp features a secondary release button that prevents any inadvertent disengagement of the camera/plate from the clamp, thereby adding to the head's overall security and stability. The three separate controls allow a photographer to exercise extremely fine control over the orientation of the camera, whether it's a DSLR, medium-format camera or a camcorder. Pan, for instance, can be adjusted while the tilt stays locked, enabling precise movement that's measurable - there are degree markers at the panning base for panoramic photography. The C-10 is CNC-machined from an aircraft-grade aluminium alloy and anodized with an oxidation treatment that ensures a durable, high-quality finish.