ExpoImaging ExpoAperture - Manual (Page 11)

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Step 5 - Find the desired number of depth-of-field zones
for your distance range. This number is located on the
silver arc just beneath the f stop number. The f stop value
immediately above the zone number is the largest aperture
you can use to get your depth-of-field.
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In the example above, the f stop number above the ‘4’ zones
indicates that f16 is the largest f stop capable of providing 4
depth-of-field zones with a 50 mm focal length lens.