wall of the shaft 14 and in relation to the longitudinal axis 12 of the shaft 14 by an angle u03b2 specifically pointing outward by a few degrees the endoscope 10 also comprises a light guide 30 which is shown separately and on an enlarged scale in fig3 the light guide 30 in fig1 is arranged along the shaft 14 specifically in the interior of the shaft 14 near a wall 32 of the shaft 14 directed away from the opening 24 and parallel to the longitudinal axis of the shaft 14 the light guide 30 is substantially rigid and has for example a metal sleeve in which optical fibers or another light conducting medium not shown are contained at a proximal end 34 the light guide 30 has a coupling part 36 which cooperates with the coupling part 18 of the shaft 14 to secure the light guide 30 on the shaft 14 the coupling part 18 and the coupling part 36 together preferably form a plug coupling so that when the light guide 30 which is withdrawable from the shaft 14 is reinserted into the shaft 14 it can be secured on the shaft 14 by simply plugging together the coupling parts 18 and 36 the plug coupling is designed such that the light guide 30 can be coupled to the shaft 14 only in a specific position of rotation about its own longitudinal axis moreover the light guide 30 has at the proximal end a connector 38 for attachment of a fiber optic cable not shown via which light from an external light source can then be fed to the light guide 30 as can be.