ExpoImaging ExpoAperture - Manual (Page 41)

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f16 multiplied by ¼ zone gives you aperture f4.
Therefore, use f4 at 100mm focal length to get a
depth-of-field of 60’ - 120’.
Step 3 - Divide the f stop found for 1 distance zone by the
fraction of the zone required to find your preferred depth-
of-field.