Practice question · Estimate
Adding one third of a stop to a print exposure multiplies the time by what factor?
Estimate on a scale from no change (1) to double (2).
Hints
- A whole stop is a factor of two.
- A third of a stop is the cube root of two.
Show the answer
1.26 (answers within ±0.06 count)
Why
About 1.26, the cube root of two. Two more such steps take you to 1.59 and then to 2.00, a whole stop. Working in thirds is what makes print exposures repeatable across sessions, because the increments mean the same thing whatever the base time happens to be.
Practise The Enlarger and the Print
The app has 5 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
More questions on The Enlarger and the Print
- A printer moves from a small print to one twice as large on each side and finds that the old exposure time…
- A condenser enlarger produces a more contrasty print from the same negative than a diffusion enlarger does.
- Arrange the steps of making a print in the order they are carried out.
- Print exposures governed by the inverse-square law behave geometrically rather than arithmetically. Why does…
- Which are true of making a test strip?
- An enlarging lens of 50 millimetres focal length is set to a magnification of 5. How far, in millimetres, is…
- An enlarging lens should be used wide open, so that the shortest possible exposure time is needed.
- Match each darkroom tool to its job.