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A common tripod feature that provides extra height without making the model much larger to carry. As this is a single column it can make the camera support unstable with increased vibration noticeable. Try to avoid using this where possible and always increase the leg length to gain height first before resorting to the centre column. Centre columns that have a crank handle and a geared control or those with pneumatic-dampening make it easier for you to accurately control the height adjustment.