The Choice of Wave-lengths for Achromatism in Telescopes

Details The Choice of Wave-lengths for Achromatism in Telescopes The Choice of Wave-lengths for Achromatism in Telescopes

Oct 1924

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1924natur.114q.536s&link_type=abstract

Nature, Volume 114, Issue 2867, pp. 536 (1924).

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DURING the past summer, in the Transactions of the Optical Society, Mr. J. W. Gifford has directed attention anew to the question as to the two wave-lengths most suitable for achromatising telescope objectives. Mr. Gifford has constructed telescopes in which the paraxial focal length for the D and E lines is the same, and, judging by the performance of such objectives, he considers such a choice superior to the more customary choice of the C and F lines. By a different path I have been led to a similar judgment, at least for telescopes of large aperture.

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