The Opteka TH40 features smooth operational movement and positive locking. Made of magnesium alloy, they are 30% lighter (and stronger) than standard heads which make it perfect for photographers on the go. The knobs have been designed to be more ergonomic, easier to handle and more user-friendly. The ergonomic shape allows the user to better lock the ball securely. The quick release plate receiver has a safety catch to prevent accidental release of the quick release plate. This feature additional safety system prevents the accidental detaching of the camera from the head. This ball head is strong enough to hold a digital SLR camera with medium weight lenses and light medium format cameras up to 11 pounds. This head is ideal for both tripods and monopods.