I want to know the answer to the following question:
When were the ISO standards first adopted?
All the background I'm provided with is that "On an international level the German DIN 4512 system has been effectively superseded in the 1980s by ISO 6:1974, ISO 2240:1982, and ISO 5800:1979 where the same sensitivity is written in linear and logarithmic form as "ISO 100/21°" (now again with degree symbol).". Is that enough to answer the question?
Answer: yes