ExpoImaging ExpoAperture - Manual (Page 26)

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Step 4 - Find the number of zones in your depth-of-field
range on the front of the Guide to get your aperture setting.
In the example above, f8 is the largest aperture setting you
can use to get ½ of a distance zone. Therefore, use f8 with
your 500mm focal length to get a depth-of-field from 300’
to 375’.
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