Zero-degree assistant's device for a microscope

A zero-degree assistant's device for a microscope has a tube carrier for the principal observer's tube, an interface for the microscope body, an assistant's module, pivotable about an axis, having an interface for an assistant's tube, and having a retaining device for releasing and immobilizing the assistant's module, the tube carrier for the principal observer's tube being mounted tiltably about a rotation axis in such a way that tilting of the tube carrier for the principal observer's tube into a tilted position makes possible unrestricted pivoting of the assistant's module.