| 摘要 |
A concentric self-conjugate optical system of substantially unit power is improved by altering the relations among the concentric spherical surfaces of the system to produce a circular locus of points of zero tangential aberration at a distance from the optical axis. The self-conjugate system is also improved by the incorporation of a novel concentric plano-convex triplet lens. The image and object planes of the concentric self-conjugate system are divorced by the use of prisms. The concentric system with divorced image and object planes is improved by the incorporation of a concentric doublet lens or by the incorporation of a novel concentric plano-convex triplet lens. The concentric system with its divorced image and object planes can also be modified to produce in the divorced image and object planes loci of points of zero tangential aberration.
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