Method for operating an optical system and optical system

The invention provides a microscope (2) as part of an optical system (1) used to spatially image an object in an image plane, and methods for its use, wherein the microscope (2) has at least one lens system assigned to a respective beam path (3, 4) and a converging lens arrangement (11) assigned to the beam path(s) (3, 4), wherein the at least one lens system includes a first lens arrangement (3a; 4a) and a second lens arrangement (3b; 4b) arranged between the first and the converging lens arrangement.