at a distance from the objective 1 and which has a lens 6 with negative refractive power and a lens 7 with positive refractive power and another cemented doublet having a lens 8 with positive refractive power and a lens 9 with negative refractive power and an optical element 10 which has zero refractive power and which is arranged at a distance do of 126 5 mm from lens 9 the data of this tube lens unit 2 are shown in table 4 the associated tube lens unit is shown in fig5 the data of the tube lens unit correspond to the values indicated in table 4 the constructional data of another objective according to the invention which is not shown and which likewise comprises three partial systems are indicated in table 6 in this case the first partial system provided on the object side comprises a cemented doublet and two individual lenses the second partial system which is arranged downstream on the image side comprises a cemented triplet and a cemented doublet downstream of the latter on the image side in the third partial system there follows a cemented doublet and an individual lens the schematic representation of the chromatic aberration in fig6 shows that an objective according to the invention has very good correction in the near infrared in this case e g 800 nm the invention is not limited to the embodiment examples shown herein further developments by a person skilled in the art do not constitute a departure.