Hurter and Driffield

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H & D curve used in sensitometry


Ferdinand Hurter (1844–1898) and Vero Charles Driffield (1848–1915) were nineteenth-century photographic scientists who brought quantitative scientific practice to photography through the methods of sensitometry and densitometry.

Hurter & Driffield's actinograph.

Among their other innovations was a photographic exposure estimation device known as an actinograph.[1]

See also[edit]

  • H&D speed numbers, originally described in 1890, for film speed measurements

References[edit]

External links[edit]