A flexure assembly operable to control variation of the displacement between a detector and a lensing arrangement along the optical axis of a camera so as to vary camera focus, and a camera incorporating such a flexure assembly. In some embodiments, the flexure assembly provides for precise control of linear displacement along the optical axis and minimal displacement along other axes or modes. A flexure assembly can additionally be relatively lightweight in construction. In some embodiments, the flexure assembly comprises one or more flexure elements adapted to permit movement along a movement axis and resist movement along axes other than the movement axis. In some embodiments, the movement axis of the or each flexure element is aligned with the optical axis of a corresponding lensing assembly.