Practice question · Numerical answer
How many whole stops separate f/2 from f/11?
Hints
- Step through the full-stop series one number at a time.
- The series runs 2, 2.8, 4, 5.6, 8, 11.
Show the answer
5
Why
Five. Each step multiplies the f-number by about 1.414 and halves the light: 2, 2.8, 4, 5.6, 8, 11. Five stops is a factor of 32 in the light, which is why a lens that opens to f/2 is worth so much more than its half-stop-larger price tag suggests.
Practise Aperture, Shutter and Sensitivity
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