| 摘要 |
The very fast (rapid) catadioptric lens having a relative aperture of 1:1 consists, seen in a direction of the movement of the light, of a converging front lens, a Mangin mirror and a converging field lens, which are separated by air spaces. The catadioptric lens is characterised in that the front lens is biconvex and mirror-coated on the reverse side in its central part, that the field lens is planoconvex and arranged in a central bore of the Mangin mirror, and that all three lenses consist of the same type of glass, so that in each case the catadioptric lens has only eight optically active surfaces. It therefore represents the first example of a spherically, chromatically and anastigmatically corrected triplet with a plane field behind a system which requires for its construction only one type of glass. If the field lens is a component of the Mangin mirror, it has two surfaces which are convex with respect to the incident light. <IMAGE>
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