To achieve a compact construction shape with a long service life, a focus adjustment apparatus for an image detection system is provided which comprises an objective having at least one lens and which comprises a motor device for the positional adjustment of the objective, wherein the lens is provided on a movable lens holder, wherein the movable lens holder is connected to a threaded unit of the motor device via a support unit provided in the movable lens holder such that the support unit can be rolled with the lens holder along a main axis of the threaded unit in accordance with a rotation of the threaded unit and such that an axis of rotation of the support unit is directed perpendicular to the main axis of the threaded unit.