Optical system of a stereo video endoscope

An optical system of a stereo video endoscope with a lateral viewing direction comprising:

• a sideways-viewing, distal optical assembly, wherein sequentially in a direction of incident light, the distal optical assembly comprises an entry lens, a deflecting unit configured as a prism unit, and an exit lens on a common optical axis;
• a proximal optical assembly, wherein the proximal optical assembly comprises a left and a right lens system channel, wherein the right and left lens system channels are identically configured and arranged parallel to each other, and the right lens system channel has a right optical axis and the left lens system channel has a left optical axis;
• and
• a prism unit arranged between the distal optical assembly and the proximal optical assembly, wherein the prism unit is configured to couple a left beam path exiting the exit lens of the distal optical assembly into the left lens system channel of the proximal optical assembly and to couple a right beam path exiting the exit lens of the distal optical assembly into the right lens system channel of the proximal optical assembly;
• wherein a second distance between the left and the right lens system channels is adjustable, the second distance being in a direction perpendicular to the first and second optical axes of the respective first and second lens system channels.