Eine Stablinseneinheit (20, 21) für ein Stablinsensystem für ein Endoskop (10) umfasst eine Stablinse (30) und eine Hülse (40), in der die Stablinse (30) angeordnet und mit der die Stablinse gefügt ist. Ein Rand (41, 42) der Hülse (40) ist nicht bündig mit einem Ende (31, 32) der Stablinse (30).The units (20, 21) have a case (40) in which a rod lens (30) is arranged. Proximal and distal edges (41, 42) of the case are not flush with proximate and distal ends (31, 32) of the rod lens. The ends of the rod lens partly protrude against the edges of the case. The edges of the case comprise a tooth or a gap for receiving the tooth. The case comprises an aperture (45) i.e. small bore, at which the case is bonded or soldered with the rod lens. A part of the edges of the case comprises a chamfer. The proximal edge of the case comprises portions in a plane vertical to an optical axis (38). An independent claim is also included for a method for manufacturing a rod lens system.