We are interested in the realization of active visual tasks, and we propose an innovative visual servoing method using parameters obtained from visual motion processing. In particular, we consider the task of dynamically aligning the optical axis of a translating camera with its unknown direction of translation, by controlling the orientation of the camera. Parameters of the 2D affine motion model are used. We show experimental results of this method implemented on a six d.o.f. robot arm carrying a camera on its end-effector.