A dictionary of photography for the amateur and professional photographer (1889)
Wall, E. J. (Edward John), 1860-1928 · New York : E. & H.T. Anthony · leaf 114
DICTIONARY OF PHOTOGRAPHY. io4 to a flint meniscus. This gave a much flatter field, and spherical aberration was much reduced, allowing the use of larger diaphragms. Dallmeyer introduced his single lens (fig. n), which consists of a negative flint enclosed between two positive crown-glass lenses.… … Fig. ii. Fig. 12. and totally eliminated spherical aberration. Marginal definition and flatness of field were both improved. To obviate distortion, many doublet lenses were introduced, that of Mr. Ross being shown in fig. 12. This instrument pos- sesses a wide angle, giving splendid definition,…
Photography
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