An endoscope with an insertion tube, wherein the insertion tube comprises a proximal passive flexible section and a distal bending section, cuts (2611, 2621; 2613, 2623) are provided in the proximal passive flexible section to allow for bending the proximal passive flexible section, adjacent cuts (2611, 2621; 2613, 2623) in the proximal passive flexible section are unequally spaced, the proximal passive flexible section comprises secondary cuts (2621; 2623) adjacent to main cuts (2611; 2613), wherein the secondary cuts (2621; 2623) are arranged closer in a longitudinal direction of the proximal passive flexible section to the adjacent main cuts (2611; 2613) on one side of the secondary cuts (2621; 2623) than to the adjacent main cuts (2611; 2613) on the other side of the secondary cuts (2621; 2623), and the main cuts (2611; 2613) extend along the circumference of the proximal passive flexible section in an interrupted manner such that uncut bridges (2631; 2633) remain between main cut portions (2611; 2613) lying on a circumferential line, wherein the proximal passive flexible section comprises the main cuts (2611; 2613), wherein at least within a subzone in the proximal passive flexible section the main cuts (2611; 2613) are unequally spaced from each other in the longitudinal direction of the proximal passive flexible section, characterized in that at least within a first subzone in the proximal passive flexible section, the main cuts (2611; 2613) are spaced from each other in the longitudinal direction of the proximal passive flexible section with continuously increasing spacing, and at least within a second subzone in the proximal passive flexible section, the main cuts (2611; 2613) are spaced from each other in the longitudinal direction of the proximal passive flexible section with continuously decreasing spacing, wherein the first subzone and the second subzone border on each other, or a third subzone is arranged between the first subzone and the second subzone, wherein the main cuts are equally spaced from each other in the longitudinal direction of the proximal passive flexible section in the third subzone. wherein the insertion tube comprises a proximal passive flexible section and a distal bending section, cuts (2611, 2621; 2613, 2623) are provided in the proximal passive flexible section to allow for bending the proximal passive flexible section, adjacent cuts (2611, 2621; 2613, 2623) in the proximal passive flexible section are unequally spaced, the proximal passive flexible section comprises secondary cuts (2621; 2623) adjacent to main cuts (2611; 2613), wherein the secondary cuts (2621; 2623) are arranged closer in a longitudinal direction of the proximal passive flexible section to the adjacent main cuts (2611; 2613) on one side of the secondary cuts (2621; 2623) than to the adjacent main cuts (2611; 2613) on the other side of the secondary cuts (2621; 2623), and the main cuts (2611; 2613) extend along the circumference of the proximal passive flexible section in an interrupted manner such that uncut bridges (2631; 2633) remain between main cut portions (2611; 2613) lying on a circumferential line, wherein the proximal passive flexible section comprises the main cuts (2611; 2613), wherein at least within a subzone in the proximal passive flexible section the main cuts (2611; 2613) are unequally spaced from each other in the longitudinal direction of the proximal passive flexible section, characterized in that at least within a first subzone in the proximal passive flexible section, the main cuts (2611; 2613) are spaced from each other in the longitudinal direction of the proximal passive flexible section with continuously increasing spacing, and at least within a second subzone in the proximal passive flexible section, the main cuts (2611; 2613) are spaced from each other in the longitudinal direction of the proximal passive flexible section with continuously decreasing spacing, wherein the first subzone and the second subzone border on each other, or a third subzone is arranged between the first subzone and the second subzone, wherein the main cuts are equally spaced from each other in the longitudinal direction of the proximal passive flexible section in the third subzone.