Biconvex rod lenses for optical systems of medical and industrial endoscopes consist, in the majority of cases, of a rod (12) and a correction lens (14) cemented to one end of the rod, at least one marginal cylinder (15) being provided on the rod, which cylinder has a greater diameter in comparison with the parts of the rod (12) which are adjacent to it and by which the rod lens (9) is supported, in the assembled condition, internally on an internal tube of the barrel of the optical system. In order to prevent shearing forces from occurring on bending the barrel at the position of cementing between the rod (12) and the correction lens (14), it being possible for such shearing forces to result in a fracture of the rod lens (9), it is proposed that the correction lens (14) and the rod (12) have a smaller diameter than the marginal cylinder or cylinders (15) in the region of the cementing position. …IMAGE…
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