Practice question · Estimate
The log exposure range falls from about 1.50 at grade 0 to about 0.60 at grade 5. On average, how much does one whole grade change it by?
Estimate on a scale from no change (0) to 0.5 in log exposure (0.5).
Hints
- Find the total change first, then divide by the number of steps.
- There are five steps from grade 0 to grade 5.
Show the answer
0.18 (answers within ±0.03 count)
Why
About 0.18 in log exposure, which is a little over half a stop per grade. That is the honest size of a paper grade: useful, and much smaller than the difference between an N−1 and an N+1 development. Contrast is mostly won in the tank and only trimmed at the enlarger.
Practise Paper Grades and Multigrade Filtration
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