ExpoImaging ExpoAperture - Manual (Page 28)

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If you want all subjects from 15” to 18” to be in focus, then
find those distances on the silver inner ring of the Zone Dial.
Example: Given a 35mm camera, a 50mm focal
length, and a depth-of-field of 15” - 18”.
Step 1 - On the Zone Dial side of the Depth-of-Field
Guide, find the range of distances that you would like to be
in focus.
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