I was curious to know how the term "ISO" was coined for referring the image sensor's sensitivity. Is there any reason or circumstance that contributed for terming "ISO"?
Also, does ISO has a literal expansion?
If it refers the ISO organisation, why is sensitivity called just "ISO"? Is there any other formal name for referring sensor sensitivity?
Answer
ISO is the short name for the International Organization for Standardization.
The applicable standard for colour print film speed is ISO 5800:2001, and for the digital still camera imaging equivalent it is ISO 12232:2006. The numbers used in the linear system (there is also a logarithmic equivalent) and procedures used are nearly equivalent to the former ASA (American Standards Association) values for film; the logarithmic system (seen rarely now) is equivalent to the old DIN (Deutsches Institut für Normung) values.
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