1. A scanner for determining the 3D geometry of at least a part of the surface of an object, said scanner comprising: at least one camera accommodating an array of sensor elements, a light source for generating a probe light, an optical system for transmitting the probe light towards the object along an optical path thereby illuminating at least a part of the object with said probe light and for transmitting at least a part of the light returned from the object to the camera, said optical system comprising: a focus element for focusing at least a part of the probe light on the object; and a translation stage for adjusting and controlling a position of the focus element along the optical path for varying a position of at least the part of the probe light as focused on the object, and one or more built-in motion sensors which are configured to yield data for: remotely controlling an image displayed on a display based on acquired scan data, or stitching or registering partial scans to each other.