the invention is directed to an objective , particularly for telescope - type stereomicroscopes . the objective comprises two lens groups , a first lens group and a second lens group . the first lens group , which faces the object plane , has a positive refractive power and comprises a plurality of lenses of which at least two form a cemented component . the second lens group , which is on the image side , has a negative refractive power and comprises a collecting cemented component and a diverging lens . the objective is characterized in that the following conditions b 1 and b 2 are met : where d ap represents the diameter of the exit pupil of the objective and ω 1 represents the maximum field angle .