Stupid question I assumed I knew the answer to

f/4.5 to f/6.3 is one stop.

f/4 to f/5.6 is one stop.

EDIT: 16 people looked at this without replying. Wonder what that tells us?
 
People stopped to look but didn't know how to stop to answer :shrug:





;)
 
Multiply a stop by 1.4 (OK, the square root of 2 but 1.4 is close enough!) and the result is the next full stop smaller.
 
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