A simple example is the three-element Cooke triplet, still in use over a century after it was first designed, but many current photographic lenses are much more complex.
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In his book, Queen Mary (London, 1959), the Queen's official biography, James Pope-Hennessy reports that the Queen's Aunt Augusta was not fond of the new science of photography, fearing it would intrude deeply into the private lives of Royal personages; at pp. 101-105 he offers a masterly sketch of this formidable lady.