An illumination apparatus (10) for the generation of an illuminated region for a camera-based code reader (100) is provided which comprises at least one light transmitter (12), an optical transmission system (14), a holder (24) for the optical transmission system (14) and a setting device (28), by means of which the holder (24) can be moved whereby the illuminated region can be focused at a working distance and/or be adapted in its dimensions. In this connection the holder (24) is fixed at at least one point of fixation (26) so that the holder (24) is moved relative to the light transmitter (12) in a compulsory guided manner on actuation of the setting device (28), however, maintains its relative position with respect to the light transmitter (12) at the point of fixation.