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.
Among their other innovations was a photographic exposure estimation device known as an actinograph.[1]
See also
- H&D speed numbers, originally described in 1890, for film speed measurements
References
External links
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