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Dialyte lens
A dialyte lens (sometimes called a ''dialyt''〔(The optics encyclopedia, Volume 4 edited by Thomas Gordon Brown )〕) is a compound lens design that corrects optical aberrations where the lens elements are widely air-spaced.〔(Michael Bass, Casimer Decusatis, Vasudevan Lakshminarayanan, Handbook of Optics, Third Edition Volume I: Geometrical and Physical Optics, page 25 )〕 The design is used to save on the amount of glass used for specific elements or where elements can not be cemented because they have dissimilar curvatures.〔Fred A. Carson, Basic optics and optical instruments, page AJ-4〕 The word ''dialyte'' means "parted", "loose" or "separated".〔(Peter L. Manly, Unusual Telescopes, page 55 )〕
==Dialyte telescopes==
The idea of widely separating the color correcting elements of a lens dates back to W. F. Hamilton's 1814 catadioptric Hamiltonian telescope and Alexander Rogers' 1828 proposals for a ''dialytic refractor''.〔(The Petzval Telescope & Sub-Aperture Color Correctors )〕 The goal was to combine a large crown glass objective with a much smaller flint glass down stream to make an achromatic lens, since flint glass at that time was very expensive.〔(Peter L. Manly, Unusual Telescopes, page 55 )〕 Dialyte designs were also used in the Schupmann medial telescope designed by German optician Ludwig Schupmann near the end of the 19th century and in John Wall's 1999 "''Zerochromat''" retrofocally corrected dialytic refractor.
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