Hurter & Driffield
Ferdinand Hurter (1844–1898) and Vero Charles Driffield (1848–1915) were 19th century scientists in the field of photography. They studied photography quantitatively and used methods of sensitometry and densitometry .
One of their inventions was a device with which one could estimate the exposure parameters, the "actinograph".
Among other things, they investigated non-linearities with very short and very long exposure times.
A unit for determining the film speed of photographic plates, H&D, was named after them.
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- ^ William Bates Ferguson (Editor): The Photographic Researches of Ferdinand Hurter & Vero C. Driffield: Being a Reprint of Their Published Papers, Together With a History of Their Early Work & a Bibliography of Later Work on the Same Subject . London: Royal Photographic Society of Great Britain, 1920.
- ↑ Erna Padelt, Hansgeorg Laporte: Units and sizes of the natural sciences . Fachbuchverlag Leipzig, 1967 (under Scheiner: "Identification of the sensitivity to light of photographic plates (see Table 57)." In the table there are conversions from DIN to ASA, GOST, Scheiner and H&D).
- Ron Callender: Encyclopedia of Nineteenth-Century Photography . 2008, pp. 732–4 ( A Brief History of Hurter & Driffield ).