ExpoImaging ExpoAperture - Manual (Page 33)

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4b. Setting the Aperture for a
Depth-of-Field Less than 12”.
Because it is not practical to include all distances on the
ExpoAperture Depth-of-Field Guide and still keep it
relatively simple, you must use the following procedure to
find your preferred aperture setting if you wish to use it for
focus distances less than 12”.
Double (or triple, etc.) your distance range in order to get
the desired distances within the range of the Zone Dial,
then count the number of zones involved. If you doubled
your distance range, then you must also double the amount
of zones corresponding to that distance, and if you tripled
your distance range, then triple your zones, etc.
Then find your preferred aperture setting on the front of
the Depth-of-Field Guide using the doubled or tripled, etc.
zone numbers.
See the following example for a more detailed explanation .