An endoscopic system according to the invention, in particular for colonoscopy, includes a flexible endoscope with an elongate, flexible shaft, a regulator part, and also an operating part which can be placed on or pushed onto the shaft and which has at least one control element, wherein the endoscopic system furthermore includes a shaft stop, which can be secured on a patient support and which has a locking mechanism, controllable by the at least one control element, for locking the shaft against movement in a longitudinal direction of the shaft.
