ABSTRACT
Centering can be performed for single lenses or cemented lens groups such as doublets or triplets. After the manufacturing steps of preshaping, rough grinding, fine grinding, and polishing, a lens border cylinder is usually tilted with respect to the optical axis of the lens. The centering error preferentially arises for lenses that were placed at the rim of a carrier body for lapping and subsequent polishing, since in this case the interaction of the tool and the lens surface is strongly asymmetric and not rotational-symmetric. Visualization of the impact of lens centering error on the orientation of a mounted lens, leading to an angular deviation between the optical axis of the lens and the mechanical axis of the lens and the mount. Classical centering is performed on turning machines. Depending on the centering tool geometry, edging, grooving, and beveling can be realized simultaneously or subsequent to the actual centering process where necessary.
