Vinten 3881-3 150 mm bowl EFP tripods are designed to offer maximum stability and robustness and are ideal for demanding field and studio applications where a longer lens and heavier viewfinder are used. The Pozi-Loc cam-operated clamping system requires low effort with a 90° turn from on to off, providing the user with a positive indication that the tripod is securely locked. The profile of the knob ensures that camera cables cannot snag.