Practice question · Estimate
Niépce reported that the view from his window at Le Gras required an exposure measured in hours. How many hours did he give as the figure?
Estimate on a scale from 0 hours (0) to 24 hours (24).
Hints
- It is a working day rather than a few minutes.
- The traditional figure is a single-digit number of hours.
Show the answer
8 (answers within ±2 count)
Why
Eight hours is the figure Niépce reported, and it is the number every textbook repeats. Later research on the plate and on the movement of the shadows in it has argued for several days of intermittent exposure, so the honest statement is: eight hours as reported, probably longer in fact.
Practise The Birth of Photography and Its First Theory
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