The dictionary of photography for the amateur and professional photographer (1897)
Wall, E. J. (Edward John), 1860-1928, Bolas, Thomas · London : Hazell, Watson & Viney · leaf 133
Chromatic Aberration chemical foci, or the lenses are said to be uncorrected or non- achromatic. Now it is a fact that crown and flint glass have different dispersive powers, that is, they produce spectra which … Fig. 15. differ in the position of the Fraunhofer lines. With the crown glass the distances between a b and b c, in the red and orange, is greater than with the flint, whereas with the flint the distances Fig. 16. between f g and G H are greater than with the crown. Therefore we may assert that,…
Photography
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