ExpoImaging ExpoAperture - Manual (Page 16)

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Step 4 - To find the range of distances that will be in focus,
simply divide the total number of zones by two and equally
extend them to either side of your focus distance.
In the example above, placing the focus distance in the
middle of the 3 depth-of-field zones will give you from 5 1 /
2
feet to 12 feet in focus.