The Manfrotto 438 Levelling Head provides a quick means of levelling. It fits between your tripod and existing head and can provide 10 degrees of adjustment. It is ideal for QTVR work and for taking panoramas and also for video work using a tripod without a ball leveller. The lever lock on the 438 is not as convenient to operate/lock as the knob used on the Acratech Levelling Head (AC1117). The 438 weighs 650g.