Indicator of light sensitivity to a photographer
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FILMSPEEDIndicator of light sensitivity, to a photographer
phototonusthe sensitivity of a living organism to light
phototonusesPHOTOTONUS, the sensitivity of a living organism to light
sensitometerA device for measuring the sensitivity of photographic equipment to light
phototonicrelating to phototonus, the sensitivity of a living organism to light
sensitometersA device for measuring the sensitivity of photographic equipment to light
isothe numerical exposure index of a photographic film under the system adopted by the International Standardization Organization, used to indicate the light sensitivity of the film's emulsion
porphyriaA rare hereditary disease in which the blood pigment hemoglobin is abnormally metabolized. Porphyrins are excreted in the urine, which becomes dark; other symptoms include mental disturbances and extreme sensitivity of the skin to light