Response to Acros in Microphen - and why are ISO ratings inflated?

To be technically correct...

There is no such thing as "ISO 100." There is "ASA 100," "DIN 21," and "ISO 100/21." There should be a degree sign after 21 in these examples.

The details of measurement methods have changed. Notation has changed.

Also, I have seen several ISO 100/21 film that appear to be actually faster than the designated speed. (All color negative though)

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