The endoscope system comprises a radiation source (34), which is assigned in such a manner that the source emits a modulated radiation. An object (2) is examined by the endoscope system with an illuminated radiation. A sensor (26) detects the reflected radiation of the object, where an evaluation device (35) receives the measured values of the detected radiation of the sensor. One pixel determines a phase difference based on the measured values. A distance between the object and the sensor is calculated by the phase difference. Independent claims are also included for the following: (1) a supplementary module with an interface for binding an endoscope (2) an endoscope optics, which is designed as an insert into an endoscope.
