iso 320 is for iso 400

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Dervast
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iso 320 is for iso 400
1 month ago

Hi,

I am trying to understand the math for finding the -2/3 of the iso 400. Or for example the -1/3 of the iso 800.

Should I do the calculation on the linear scale or in the logarithmic?

could you please help me withh that?

Regards

A

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