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triplet lens
A triplet lens is an optical device consisting of three single lenses. The triplet design is the simplest to give the required number of degrees of freedom to allow the lens designer to overcome all Seidel aberrations.
The term is used in two ways. The three lenses may be cemented together, as in the ''Steinheil triplet''. Or a triplet may be designed with three spaced glasses, e.g. the Cooke triplet. The former has the advantage of higher optical throughput due to fewer air-glass interfaces, but the latter provides greater flexibility in aberration control, as the internal surfaces are not confined to have the same radii of curvature.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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