Why 'more or less stopped using ISO'?

Started Feb 19, 2014 | Questions thread
Iliah Borg Forum Pro • Posts: 24,938
Re: Maybe this will help.

Well "Photometry is the science of the measurement of light in terms of it's perceived brightness to the human eye" and those measurements have units. The relationship between the measured quantity and brightness is what it is and the definition for photometry probably expresses it best.

A huge disagreement exists about weighting functions.

But the bigger thing is that it is not about the raw numbers. If the microphone is more sensitive, or a mic amplifier has higher gain, are the numbers on the tape louder?

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