| 摘要 |
In the case of a lens system, in particular a projection lens system in semiconductor lithography, with a plurality of optical elements, such as lenses, which are mounted in mounts, the mounts being connected to one another, if appropriate by means of adjusting rings, at least one inner mount of an optical element which is intended for removal and/or later fitting is connected to an outer mount by means of a three-point mounting.
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