Practice question · Estimate
A face is dodged for 3 seconds out of a 12-second base exposure. How many stops lighter is it, to one decimal place?
Estimate on a scale from 0 stops (0) to 2 stops (2).
Hints
- Work out how much exposure the face actually received.
- Twelve over nine, expressed in stops.
Show the answer
0.4 (answers within ±0.15 count)
Why
About 0.4 of a stop. The face receives 9 seconds instead of 12, a ratio of 1.33, and the base-two logarithm of 1.33 is 0.415. That is a small but entirely visible change, which is why dodging is usually counted in a few seconds rather than in halves of the base time.
Practise Dodging, Burning and the Expressive Print
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