Abstract: The present invention relates to the field of optical probe surface inspection by interferometry, and in particular to a method and a respective apparatus for fine-controlling the position of a predetermined probe location (21) relative to a fixed reference point (12) of a probe processing apparatus fixedly coupled to an auxiliary optical laser apparatus, in which method the position is controlled with optical means. In order to simplify the apparatus it is proposed to provide a simply structured fine-control positioning system also based on the principle of interferometry. Basically, a lens-less optical arrangement is provided which uses a collimated input laser beam (10) and thus presetting said probe location position within a predetermined converging range of ¼ of the wave length of the applied fine-controlling positioning laser beam (10).