Magnification objective with six lenses - has min. specified aperture ratio, two meniscus lenses, diverging lens and converging lens

摘要

Magnification objective has six lenses with minimum aperture ratio 1:2:9, two meniscus lenses, one diverging lens and one converging lens. The two converging meniscus lenses enclose a diaphragm space and are followed outward by a diverging lens and a converging lens. The concave side of all curved surfaces face the diaphragm. The design specification of the magnification objective comprises curvature radii of lens surfaces, thicknesses of individual lenses and air gaps. The objective has no bonded surfaces. The two outer lenses are separated from adjacent lenses by plane surfaces and a small air gap which causes no production problems.