ExpoImaging ExpoAperture - Manual (Page 42)

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5b. Setting the Aperture for a Distance
Range of more than 8 Distance Zones
To find the preferred aperture setting for distance ranges
greater than 8 depth-of-field zones, you must find the aper-
ture number required for 1/2 the number of distance zones
you would like to measure. Once you find that aperture
number, double it to find the preferred aperture setting for
your distance range.
See the following example for a more detailed explanation.