I am currently reading the "Beyond The Zone System" book by Phil Davis and I have a question.
He talks about subtracting the low value from the high value and then adding the difference to 5 to give the subject brightness range which is then used to determine the development time.
Example:
If the difference added to 5 = 7 then N development is needed
If the difference added to 5 = 9 then N - 2 development is needed
Question:
If on a very dull day, the difference added to 5 = 5 what would you do in development?
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