A lens mount for radially fixing, or for radially adjusting and fixing, in a lens tube, having a mounting ring in which tangentially running first slots form cylindrical segments which, during the operation of turning the external diameter of the mounting ring to a nominal dimension are deformed by a screw by a width of the first slots, and therefore the circumferential surface of the mounting ring is not turned, at least in part, along the segment and the external diameter has an oversize.