The invention relates to a lens (1), comprising a first lens unit (3), at least one second lens unit (5), and at least one pupil (7) having a pupil radius. The first lens unit (3) and the second lens unit (5) are arranged at a distance from each other along an optical axis (OA) of the objective, such that an intermediate space is present between the first lens unit (3) and the second lens unit (5). The second lens unit (5) is arranged on the image side with respect to the first lens unit (3). The first lens unit (3) is designed in such a way that the first lens unit produces a collimated beam.