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Ferdinand Hurter
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Ferdinand Hurter was a Swiss industrial chemist who settled in England. He also carried out research into photography.
Ferdinand Hurter. Photograph taken by his colleague in photographic research, Vero Charles Driffield
Film speed
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Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system introduced in 1974. A closely related system, also known as ISO, is used to describe the relationship between exposure and output image lightness in digital cameras. Prior to ISO, the most common systems were ASA in the U.S. and DIN in Europe.
This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dro
This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dropped, making (e.g.) "ISO 100" effectively equivalent to the older ASA speed. (As is common, the "100" in the film name alludes to its ISO rating.)
A box of Agfacolor Neu with the instruction "expose as 15/10° DIN" (in German).
A box of Agfacolor Neu with the instruction "expose as 15/10° DIN" (in German).
Weston Model 650 light meter from about 1935
Weston Model 650 light meter from about 1935
Early Weston Master light meter 1935-1945
Early Weston Master light meter 1935-1945