Practice question · True or false
A one-stop change means a factor of two in the light, whichever of the three controls is used to make it.
Hints
- That common currency is what makes the three controls exchangeable.
- Consider what a stop would mean if each control used its own scale.
Show the answer
True
Why
True, and it is the reason the triangle works at all. A stop of aperture, a stop of shutter and a stop of sensitivity are the same size, so any one can pay for any other exactly. Without a shared unit there would be no such thing as an equivalent exposure.
Practise Aperture, Shutter and Sensitivity
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