An illumination apparatus (10) is provided for a camera-based code reader (100) having a plurality of light transmitters (16) arranged in ring shape and in a fixed position with respect to a base housing part (12) and having a plurality of optical transmission systems (20) associated with the light transmitters (20) in a front housing (14) supported rotationally movably with respect to the base housing part (12), wherein the optical transmission systems (20) can be set to adapt the illumination by rotation of the front housing (14). The front housing (14) has a plurality of front lenses (20) and the front housing (14) is supported in a thread (15) with respect to the base housing part (12) so that front lenses (20) can be associated with the light transmitters (16) at a changed spacing by a rotational movement of the front housing (14).