ExpoImaging ExpoAperture - Manual (Page 44)

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Half of 10 distance zones is 5 zones. 5 zones @ 25mm
requires f5.6. Doubling 5.6 = 11.2. Therefore, to get 12” to
18” in focus (10 zones) at a 25mm focal length you should
use f11.2 (rounded to f11).
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Step 2 - Find the preferred aperture setting for half of the
number of zones in your distance range. Double the f stop
to correct for halving the number of zones, and use the
resulting f stop for your distance range.