METHOD FOR DETERMINING AN OPTICAL AXIS OF A MAIN OBSERVER CAMERA OF A MEDICAL MICROSCOPE ARRANGEMENT IN A REFERENCE COORDINATE SYSTEM, AND MEDICAL MICROSCOPE ARRANGEMENT

A method for determining an optical axis of a main observer camera of a medical microscope arrangement in a reference coordinate system includes capturing a capture region with a main observer camera and at least partly with an environment camera. The environment camera is configured to track objects and its coordinate system or a coordinate system of an optical marker forms the reference coordinate system. A test object is captured at at least one working distance where a neutral point of a zoom system of the main observer camera is determined in the coordinate system of the environment camera by capturing and evaluating image representations of the test object at different magnifications. The optical axis is determined proceeding from the neutral point. At least one item of descriptive information describing the determined optical axis in the reference coordinate system is generated and provided. Furthermore, a medical microscope arrangement is provided.